JP5072874B2 - Communication device - Google Patents

Description

  The present invention relates to a communication apparatus that connects a plurality of local communication networks via a wide area network.

  When connecting a plurality of secure local communication networks (hereinafter referred to as local networks) via a non-secure wide area communication network (hereinafter referred to as the Internet), a plurality of routes are provided to increase safety. Need to be made redundant.

  For example, a router is used to secure a plurality of routes through the Internet and connect a plurality of secure local networks. The route is switched dynamically by exchanging routing protocols between routers. At this time, a firewall or the like is provided between the Internet and the local net to maintain security. There is also a method of filtering by a router.

  In addition, there is a method of configuring a network that is not aware of the Internet by IP (Internet Protocol) tunneling (L2TPv3, PPP) using a plurality of scattered local nets as the same network segment. At this time, the plurality of paths are realized by switches equipped with STP (Spanning Tree Protocol).

  There is also a method of switching servers and distributing loads by assigning the same logical IP address to a plurality of servers providing the same service.

  As a method of communicating between private networks scattered on the Internet, for example, as disclosed in Patent Document 1, a method of communicating between devices using a private IP address of each private network is known. ing.

JP 2003-273935 A

  Conventionally, when connecting the local nets of a plurality of bases via the non-secure Internet, it may be difficult to maintain security between the local net and the Internet. In addition, if the Internet route connecting a plurality of local nets is not made redundant, the reliability of communication is lowered, so that it is essential to make the route redundant.

  However, a plurality of routes constructed in the Internet may be different in one communication provider and the other communication provider. One may be a high-speed IP network and the other may be an ADSL network. In addition, the company may have a plurality of independent routes. In these cases, it is necessary to switch the redundant route from one to the other.

  When switching to a plurality of routes, there is a method of using a router to dynamically switch routes using a routing protocol installed in the router. In this method, routing protocol packets pass between the secure side and the non-secure side.

  However, passing between the secure side and the non-secure side may not be limited to only application level data packets that are exchanged between local networks at a plurality of locations. Further, it is impossible to dynamically change the route after restricting the communication between the local networks to the data packets that are strictly passed in accordance with the security policy, and to deal with the failure of the communication path.

  By IP tunneling the Internet, a network that is not conscious of the local network can be configured, but in addition to data communication, a protocol for maintaining an IP tunnel is communicated. In addition, in the IP tunnel, it is necessary to connect a plurality of local nets connected to the same network segment. Within the same network segment, a plurality of routes are maintained in a single route by logically killing the physical ports of the switch by STP.

  However, in this method, in addition to the IP tunnel maintenance protocol, STP packets are also communicated. In addition, there is a restriction that the address system of a plurality of local networks is made the same segment.

  A method of assigning a logical IP address to a plurality of servers and performing switching or load balancing can make the service itself redundant, but does not make the communication path redundant. Communication path redundancy requires that the exits to the non-secure side of the local network at multiple sites keep track of each other's status, but this may not be possible with logical IP address assignment to services. is there.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to improve the safety and confidentiality of a communication apparatus that connects a plurality of local networks via the Internet.

In order to achieve the above object, a communication apparatus according to the present invention is a communication apparatus for connecting a plurality of local communication networks to each other via a wide area network. is connected to IP communication is possible gateway for local area network and, each gateway before Ki構 communication network, a wide area that is capable of communicating with each other by the gateway respectively and non-IP communication means for the front Ki構 communication network gateway for the network is connected, the gateway for the front Ki構 the communication network, for the first system local network capable monitor the state of each other can transmit and receive heartbeat signal indicating whether operating normally with each other includes a gateway and a gateway for the second system local area network, a gateway for the front Kihiro area network, capable of monitoring the status of each other can transmit and receive the heartbeat signal to each other Each of the first-system local area network gateways including a 1-system wide area network gateway and a second-system wide area network gateway connected to the respective local area communication networks is connected to the first IP area by the non-IP communication means. The second local area network gateways configured to be communicable with the local area network gateways and connected to the local area communication networks are respectively connected to the second area wide area network by the non-IP communication means. The gateway for the first system local communication network, the gateway for the first system wide area network, the gateway for the second system local area network, and the gateway for the second system wide area network are configured to communicate with the gateway. Alternatively, a local communication network, an IP transmission / reception unit capable of transmitting / receiving an IP packet data signal, and the IP transmission / reception unit via the non-IP communication unit A non-IP transmission / reception unit configured to be able to transmit / receive predetermined signal information set to each other, a transferable packet setting unit configured to be able to set the setting information of the predetermined signal information in advance, and the same local communication network The connected gateways for the first system and the second system on-site communication network or the corresponding gateways for the first system and the second system wide area network are notified and grasped whether the mode is the master or the slave. The two-system mode monitoring unit configured as described above, the gateways for the first system and the second system local network connected to the same local network, and the first system and the second system wide area network corresponding thereto And a gateway mode monitoring unit configured to notify and grasp each other's mode state via the non-IP communication means, and the first system wide An intra-system mode monitoring unit configured to notify and grasp the state of the mode between the regional network gateways or between the respective second-system wide-area network gateways, the inter-system mode monitoring unit, and the inter-gateway mode The monitoring results of the respective monitoring units are input, and the first system local area network gateway, the first system wide area network gateway, the second system local area network gateway, and the second system wide area network gateway A mode determination unit configured to determine a predetermined mode while comparing modes with each other, and a mode state holding unit that holds the mode state determined by the mode determination unit When, was perforated, the gateway respectively for the first system and the second system local area network, a gateway for the first system and the second system local area network is A split brain recovery setting unit in which priority information for deciding which of the first system and second system local area communication network gateway is to be the master when the split brain that becomes the master at the same time is recovered When the heartbeat signals transmitted and received by the second system mode monitoring units of the first system and second system local area communication network gateways are interrupted, they stop each other. And the mode determination unit of each of the first system and second system local communication network gateways makes the heartbeat signal after each of the first system and second system local communication network gateways becomes a master. Is restored, and when the two inter-system mode monitoring units determine that they are masters of each other, the first-system and second-system local area communication networks Each mode determination unit of each gateway acquires the priority information from each of the split brain recovery setting units, compares the priority information with each other, maintains the master with the higher priority, The lower one is configured to transition to a slave.
The communication device according to the present invention is a communication device for connecting a plurality of local communication networks to each other via a wide area network, and each of the local communication networks is capable of IP communication with each of the local communication networks. A wide area network gateway configured to be able to communicate with each of the local communication network gateways and non-IP communication means is connected to each of the local communication network gateways. The gateway for the local communication network is capable of transmitting and receiving heartbeat signals notifying whether or not they are operating normally and can monitor the state of each other and the gateway for the second local network And the wide area network gateway is capable of transmitting and receiving the heartbeat signal to each other and monitoring each other's state. A gateway for a second system wide area network, and each gateway for a first system local communication network connected to each of the local communication networks is connected to the first system wide area network gateway by the non-IP communication means. Each second-system local network gateway connected to each local-network network is configured to be able to communicate with each second-system wide-area network gateway by the non-IP communication means. The first system local area network gateway, the first system wide area network gateway, the second system local area network gateway, and the second system wide area network gateway are respectively connected to the wide area network or the local area communication network. An IP transmission / reception unit capable of transmitting / receiving an IP packet data signal, and a predetermined location with the IP transmission / reception unit via the non-IP communication means A non-IP transmission / reception unit configured to be able to transmit / receive signal information to / from each other, a transferable packet setting unit configured to be able to set setting information of the predetermined signal information in advance, and the first communication network connected to the same private network It is configured to notify and grasp each other's mode as a master or a slave between the first system and second system local area communication network gateways or the corresponding first system and second system wide area network gateways. A two-system mode monitoring unit, the first-system and second-system local-communication network gateways connected to the same local-communication network, and the corresponding first-system and second-system wide-area network gateways, An inter-gateway mode monitoring unit configured to notify and grasp each other's mode status via the non-IP communication means; and each of the first system wide area network gateways. Intra-system mode monitoring unit configured to notify and grasp the state of the mode between the two or each second-system wide area network gateway, and the inter-system mode monitoring unit and inter-gateway mode monitoring unit, respectively The result of monitoring is input, and the mode of each of the first system local area network gateway, the first system wide area network gateway, the second system local area network gateway, and the second system wide area network gateway is: A mode determination unit configured to be determined to be the predetermined mode while comparing with the mode state of each other, and a mode state holding unit that holds the state of the mode determined by the mode determination unit, Each of the first-system and second-system local area network gateways has a master transition time setting unit capable of storing time information of transition to the master, When the heartbeat signals transmitted and received by the second system mode monitoring unit of each of the first system and second system local area communication network gateways are determined to be stopped, After the mode determination unit of each of the first-system and second-system local area communication network gateways becomes the master for each of the first-system and second-system local area network gateways, the heartbeat signal is restored, When it is determined that the mode monitoring units between the two systems are masters of each other, the mode determination unit of each of the first system and second system local area network communication gateways, from the master transition time setting unit, The time at which each transitions to the master is acquired, and these times are compared with each other. The master is maintained earlier, and the slave transitions later. Characterized in that it is configured to.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to improve the safety | security and confidentiality of the communication apparatus which connects several local networks via the internet.

It is a block diagram which shows the structure of the communication apparatus of 1st Embodiment which concerns on this invention. FIG. 2 is a configuration diagram of a network system showing a state in which the communication device of FIG. 1 is connected to a plurality of local networks and the Internet. It is a flow which shows the control method of embodiment of FIG. 1, and is a flowchart which shows the outline | summary of a packet transfer procedure. 3 is a flowchart showing a procedure for switching a logical IP address when the first system local net GW of FIG. 1 is stopped. It is a flowchart which shows the procedure which switches a logical IP address when the 1st type | system | group internet GW of FIG. 1 stops. It is a flowchart which shows the procedure which sets a 1st system as a master again after the 1st system Internet GW of FIG. 1 stops. It is a block diagram which shows the structure of the communication apparatus of 2nd Embodiment which concerns on this invention. FIG. 8 is a flowchart showing an overview of an example procedure for eliminating split brain when both the first system local net GW and the second system local net GW are stopped and restarted in the communication apparatus of FIG. 7. In the communication device of FIG. 7, the split brain detection after the heartbeat signal between the first system local net GW and the second system local net GW is disconnected and communication is restored again, and the first system GW is preferentially mastered. It is a flowchart which shows the procedure which cancels | releases a split brain by setting. It is a block diagram which shows the structure of the communication apparatus of 3rd Embodiment which concerns on this invention. FIG. 11 is a flowchart showing an outline of a split brain elimination procedure when both GWs of FIG. 10 are stopped and then restarted. FIG. 11 is a flowchart showing an overview of a split brain elimination procedure when heartbeat communication between the 1-system and 2-system GWs of FIG. 10 is restored. It is a block diagram which shows the structure of the communication apparatus of 4th Embodiment which concerns on this invention. It is a flowchart which shows the outline | summary of the procedure which sets automatically the transfer setting between GW. It is a flowchart which shows the outline | summary of the packet transfer procedure of the communication apparatus of 4th Embodiment concerning this invention.

  Embodiments of a communication device according to the present invention will be described below with reference to the drawings.

[First Embodiment]
1st Embodiment of the communication apparatus which concerns on this invention is described using FIGS. FIG. 1 is a block diagram illustrating a configuration of a communication apparatus according to the present embodiment. FIG. 2 is a configuration diagram of a network system showing a state in which the communication apparatus of FIG. 1 is connected to a plurality of local networks and the Internet 304. FIG. 3 is a flowchart showing an outline of a packet transfer procedure in the flow showing the control method of the embodiment of FIG. FIG. 4 is a flowchart showing a procedure for switching the logical IP address when the first system local net GW apparatus 1a of FIG. 1 is stopped. FIG. 5 is a flowchart showing a procedure for switching the logical IP address when the first-system Internet GW apparatus 2b of FIG. 1 is stopped. FIG. 6 is a flowchart showing a procedure for setting the first system as the master again after the first system Internet GW apparatus 2b of FIG. 1 is stopped.

  As shown in FIG. 2, in the present embodiment, a secure local communication network (hereinafter referred to as a local net), that is, a first local net 301, a first local net 301, and a non-secure wide area communication network such as the Internet 304 are used. The two local nets 302 and the third local net 303 are connected via gateways (hereinafter referred to as GW). In each of these local nets, a plurality of first computers 101, a plurality of second computers 102, a plurality of third computers 103, and the like are connected.

  Each of the first local net 301, the second local net 302, and the third local net 303 has virtually two GWs, that is, the first GW device 5 and the second GW device 6.

  The first system GW apparatus 5 includes a first system local net GW apparatus 1a connected to the local net side and a first system Internet GW apparatus 2b connected to the Internet 304 side. Similarly, the second system GW apparatus 6 includes a second system local network GW apparatus 3c connected to the local network side, and a second system Internet GW apparatus 4d connected to the Internet 304 side.

  As can be seen from the above description, there are four types of GWs that connect one local net, for example, the first local net 301 and the Internet 304, that is, the first system local net GW apparatus 1a and the first system Internet GW apparatus. 2b, the second system local GW apparatus 3c, and the second system Internet GW apparatus 4d.

  Here, in the following description, “first” is described at the head of the names of the components provided in the first system local net GW apparatus 1a. Similarly, “second” is used for the components provided in the first system Internet GW apparatus 2b, and “third” and second are used for the components provided in the second system local GW apparatus 3c. The component provided in the system Internet GW apparatus 4d is described as “fourth”.

  As shown in FIG. 1, the first system local net GW apparatus 1a includes a first transferable packet setting unit 11a, a first IP transmission / reception unit 12a, a first non-IP transmission / reception unit 13a, and a first logical IP address. A setting cancellation unit 14a, a first inter-GW mode monitoring unit 15a, a first two-system mode monitoring unit 16a, a first mode determination unit 17a, a first mode state holding unit 18a, a first LAN port 20a, And a first two-system mode monitoring port 21a.

  The first Internet GW apparatus 2b includes a second transferable packet setting unit 11b, a second IP transmission / reception unit 12b, a second non-IP transmission / reception unit 13b, a second inter-GW mode monitoring unit 15b, and a second system. Internal mode monitoring unit 19b, second two-system mode monitoring unit 16b, second mode determination unit 17b, second mode state holding unit 18b, second LAN port 20b, and second two-system mode monitoring It has a port 21b.

  The first system local network GW apparatus 1a and the first system Internet GW apparatus 2b are connected by a first system non-IP communication path 22a. The first non-IP communication path 22a for the first system includes packet communication between the first non-IP transmission / reception unit 13a and the second non-IP transmission / reception unit 13b, and the first inter-GW mode monitoring unit 15a and the second GW. It is used for mode communication between the inter-mode monitoring units 15b.

  Similar to the first system local net GW apparatus 1a, the second system local net GW apparatus 3c includes a third transferable packet setting unit 11c, a third IP transmission / reception unit 12c, a third non-IP transmission / reception unit 13c, 3 logical IP address setting cancellation unit 14c, third inter-GW mode monitoring unit 15c, third inter-system mode monitoring unit 16c, third mode determination unit 17c, third mode state holding unit 18c, third LAN port 20c and a third inter-system mode monitoring port 21c.

  Similarly, the second-system Internet GW apparatus 4d is similar to the first-system Internet GW apparatus 2b in that a fourth transferable packet setting unit 11d, a fourth IP transmission / reception unit 12d, a fourth non-IP transmission / reception unit 13d, Fourth inter-GW mode monitoring unit 15d, fourth intra-system mode monitoring unit 19d, fourth inter-system mode monitoring unit 16d, fourth mode determination unit 17d, fourth mode state holding unit 18d, fourth LAN port 20d and a fourth inter-system mode monitoring port 21d.

  The second system local network GW apparatus 3c and the second system Internet GW apparatus 4d are connected by a second system non-IP communication path 22c. Similarly to the first non-IP communication path 22a, the second non-IP communication path 22c is used for packet communication between the third non-IP transmission / reception section 13c and the fourth non-IP transmission / reception section 13d. It is used for mode communication between the third inter-GW mode monitoring unit 15c and the fourth inter-GW mode monitoring unit 15d.

  Here, FIG. 1 shows an example of a GW connected to the first local net 301 shown in FIG.

  The first LAN port 20 a is connected to a secure local net, for example, the first local net 301, and receives a signal sent from the first computer 101 or the like in the first local net 301. Further, the first LAN port 20a can communicate with each of the first IP transmission / reception unit 12a and the first logical IP address setting cancellation unit 14a.

  The second LAN port 20 b is connected to the non-secure Internet 304 and can receive signals transmitted via the Internet 304. The second LAN port 20b can communicate with the second IP transmission / reception unit 12b and the second intra-system mode monitoring unit 19b.

  The first two-system mode monitoring port 21a can communicate with the third two-system mode monitoring port 21c of the second system local net GW apparatus 3c. The first two-system mode monitoring port 21a is connected to the first two-system mode monitoring unit 16a so as to communicate with each other. This communication is mode communication for communicating and monitoring each other's GW mode, and heartbeat communication for notifying whether or not each other is operating normally is performed.

  The second inter-system mode monitoring port 21b can communicate with the fourth inter-system mode monitoring port 21d of the second Internet GW apparatus 4d. The second inter-system mode monitoring port 21b is connected to the fourth inter-system mode monitoring unit 16d so that they can communicate with each other. Similar to the first and third inter-system mode monitoring ports 21a and 21c, this communication is a mode communication that communicates and monitors each other's GW mode, and informs whether or not they are operating normally. Heartbeat communication is performed.

  Here, the mode is a GW state, and includes at least three states: master, slave, and undetermined. The logical IP address is set for the secure side GW when the master is used, and the logical IP address is not set when the slave is undetermined.

  Each of the first and second transferable packet setting units 11a and 11b communicates between a communication service that permits transfer between the first local net 301 and the Internet 304 and a computer that uses this communication service. It has a function to set what is allowed.

  Here, permitting transfer indicates that the communication service application set by the transferable packet setting unit is operating. For example, there are a TCP server function, a UDP server function, and an FTP server function. By starting the server application (thread or process) of the communication service protocol (TCO, UDP, FTP, etc.) and port number (TCP, UDP, etc.) set in the transferable packet setting unit, Transfer the packet of the port number by non-IP communication. A packet transferred by non-IP communication can be transmitted to the Internet 304 or a local network using a set protocol or port number.

  The first and second IP transmission / reception units 12a and 12b are configured to be able to communicate with the first and second LAN ports 20a and 20b, respectively. The first and second IP transmission / reception units 12a and 12b can transmit and receive signals to and from the first and second transferable packet setting units 11a and 11b, respectively, and the first and second transferable packet settings can be performed. Information on packet transfer settings set in each of the units 11a and 11b is input. Each of the packets received by the first and second IP transmission / reception units 12a and 12b has a function of determining whether or not the received packet is a packet for which transfer is permitted.

  Each of the first and second non-IP transmission / reception units 13a and 13b is configured to be able to communicate with each of the first and second IP transmission / reception units 12a and 12b. When each of the first and second IP transmission / reception units 12a and 12b receives a packet that is permitted to be transferred, the packet is sent to each of the first and second non-IP transmission / reception units 13a and 13b.

  For example, the second IP transmission / reception unit 12b performs transfer among a plurality of packets transmitted to the second LAN port 20b based on the transfer setting information input by the second transferable packet setting unit 11b. Receive only permitted packets. The received packet is sent to the first non-IP transmission / reception unit 13a via the second non-IP transmission / reception unit 13b and the first system non-IP communication path 22a. The packet received by the first non-IP transmission / reception unit 13a is sent to the first IP transmission / reception unit 12a and transferred to the first local network 301 via the first LAN port 20a based on the transfer setting information. The

  When a packet is transferred from the first local net 301 to the Internet 304, communication is performed along a route opposite to the above route.

  The first mode determination unit 17a has a function of determining whether the mode state of the first system local network GW apparatus 1a is master, slave, or undetermined. Similarly, the second mode determination unit 17b has a function of determining whether the mode state of the first Internet GW apparatus 2b is master, slave, or undetermined.

  The first mode determination unit 17a includes a first logical IP address setting cancellation unit 14a, a first inter-GW mode monitoring unit 15a, a first two-system mode monitoring unit 16a, and a first mode state holding unit 18a. Can communicate with each other. The first mode determination unit 17a performs the above determination based on information sent from each of the first inter-GW mode monitoring unit 15a and the first inter-two-system mode monitoring unit 16a. The determination result is sent to the first mode state holding unit 18a.

  The first mode state holding unit 18a receives the result determined by the first mode determination unit 17a and stores the result. When the determination result is a master, the first mode determination unit 17a inputs a logical IP setting request to the first logical IP address setting cancellation unit 14a. In the case of a slave, a logical IP release request is input to the logical IP address setting release unit.

  The second mode determination unit 17b includes a second intra-system mode monitoring unit 19b, a second inter-GW mode monitoring unit 15b, a second inter-two-system mode monitoring unit 16b, and a second mode state holding unit 18b. They can communicate with each other. The second mode determination unit 17b is based on information sent from the second intra-system mode monitoring unit 19b, the second inter-GW mode monitoring unit 15b, and the second inter-two-system mode monitoring unit 16b. The above determination is made. The determination result is sent to the second mode state holding unit 18b.

  Similar to the first mode state holding unit 18a, the second mode state holding unit 18b receives the result determined by the second mode determination unit 17b and stores the result.

  In the case of the master, when the mode is switched from the outside, it can receive the slave transition request and store the slave in the mode state holding unit.

  When stopping the first system local net GW apparatus 1a, the first mode determination unit 17a receives a stop request and stores “undecided” in the first mode state holding unit 18a. Similarly, when the first Internet GW apparatus 2b is stopped, the second mode determination unit 17b receives a stop request and stores “undecided” in the first mode state holding unit 18a.

  The first and second inter-GW mode monitoring units 15a and 15b can communicate with each other via the first non-IP communication path 22a for the first system. The first inter-GW mode monitoring unit 15a acquires the data stored in the first mode state holding unit 18a, and passes through the first non-IP communication path 22a for the first system Internet GW device 2b. The mode state is monitored, and the monitoring result is input to the first mode determination unit 17a. Similarly, the second inter-GW mode monitoring unit 15b acquires the data stored in the second mode state holding unit 18b and passes through the first non-IP communication path 22a for the first system local. The mode state of the network GW apparatus 1a is monitored, and the monitoring result is input to the second mode determination unit 17b.

  The second intra-system mode monitoring unit 19b has a function of monitoring the mode state of another local net, for example, the Internet GW of the same system as the second local net 302. The second intra-system mode monitoring unit 19b in FIG. 1 acquires the data stored in the second mode state holding unit 18b, and for example for the second local network 302 via the second LAN port 20b. The mode state of the first system Internet GW apparatus 2b is monitored. The result monitored by the second intra-system mode monitoring unit 19b is input to the second mode determination unit 17b provided in the same first system Internet GW apparatus 2b.

  The first and second two-system mode monitoring units 16a and 16b can communicate with the first and second mode determination units 17a and 17b, respectively. The first inter-system mode monitoring unit 16a acquires the data stored in the first mode state holding unit 18a and passes through the first inter-system mode monitoring port 21a to transmit the second system. The mode state of the local net GW apparatus 3c is monitored, and the monitoring result is input to the first mode determination unit 17a. Similarly, the second inter-system mode monitoring unit 16b acquires the data stored in the second mode state holding unit 18b, and passes through the second inter-system mode monitoring port 21b to perform the second operation. The mode state of the system Internet GW apparatus 4d is monitored, and the monitoring result is input to the second mode determination unit 17b.

  Then, the effect | action of this embodiment is demonstrated. First, normal operation will be described with reference to FIG.

  In the example of FIG. 3, a procedure for transmitting a packet from the first computer 101 in the first local net 301 to the second computer 102 in the second local net 302 via the Internet 304 is shown. In this example, the first system GW apparatus 5 connected to the first local net 301 and the first system GW apparatus 5 connected to the second local net 302 are masters, and the first system GW apparatus 5 connected to the first local net 301 is the master. The second system GW device 6 and the second system GW device 6 connected to the second local net 302 are slaves.

  First, as shown in FIG. 3, the first transferable packet setting unit 11a in the first system local network GW apparatus 1a for the first local network 301 and the second transfer in the first system Internet GW apparatus 2b are possible. Each packet setting unit 11b receives and stores packet transfer setting information by the user (step S301). Similarly, each of the third transfer setting packet setting unit in the second system local network GW device 3c for the first local network 301 and the fourth transfer setting packet setting unit in the second system Internet GW device 4d, respectively, Packet transfer setting information is input and stored (step S302).

  Similarly, packet transfer setting information is input and stored in the first system GW device 5 and the second system GW device 6 for the second local net 302 (steps S303 and S304). In the example of FIG. 3, the flowchart in the first system GW device 5 serving as a master is shown, but the transfer setting information is similarly stored for the second system.

  The operation on the first local net side will be described below.

  The first computer 101 in the first local net 301 transmits a packet addressed to the first LAN port 20a (step S305).

  The first IP transmission / reception unit 12a obtains transfer setting information from the first transferable packet setting unit 11a, and the packet transmitted to the first LAN port 20a is transferred to the computer or service permitted to transfer. It is determined whether it is a thing (step S306). At this time, in the case of a packet that does not permit transfer, the packet is not received because the communication service is not operating.

  After receiving the packet permitted to be transferred, the first IP transceiver 12a sends the received packet to the first non-IP transceiver 13a (step S307). The first non-IP transmission / reception unit 13a transfers the received packet to the first system Internet GW apparatus 2b via the first system non-IP communication path 22a (step S308).

  The second non-IP transmission / reception unit 13b in the first system Internet GW apparatus 2b receives the packet transferred via the first system non-IP communication path 22a and sends the packet to the second IP transmission / reception unit 12b ( Step S309). The second IP transmission / reception unit 12b acquires transfer setting information from the second transferable packet setting unit 11b and determines to which local net the packet should be transferred (step S310).

  The second IP transmission / reception unit 12b transmits a packet to the protocol, port number, etc. of the first Internet GW apparatus 2b for the second local network 302 based on the setting acquired from the second transferable packet setting unit 11b. (Step S311).

  The operation on the second local net 302 side will be described below.

  The second IP transmission / reception unit 12b in the first-system Internet GW apparatus 2b for the second local net 302 acquires transfer setting information from the second transferable packet setting unit 11b, and the second LAN port 20b. It is determined whether or not the packet transmitted to is permitted to be transferred (step S312). The second IP transmission / reception unit 12b receives the packet permitted to be transferred, and sends the received packet to the second non-IP transmission / reception unit 13b (step S313).

  The second non-IP transmission / reception unit 13b transfers the received packet to the first system local net GW apparatus 1a via the first system non-IP communication path 22a (step S314). The first non-IP transmission / reception unit 13a in the second-system local net GW apparatus 3c receives the packet transferred via the first-system non-IP communication path 22a and transmits the packet to the first IP transmission / reception unit 12a. (Step S315).

  The first IP transmission / reception unit 12a acquires the transfer setting from the first transferable packet setting unit 11a (step S316), and based on the transfer setting information, the second computer 102 in the second local net 302. Packet is transmitted via the first LAN port 20a (step S317). The second computer 102 in the second local net 302 receives this packet (step S318) and is completed.

  Next, the first system GW apparatus 5 for the first local net 301 and the first system GW mode for the second local net 302 are both masters, and the first system local net GW apparatus 1a for the first local net 301 is A procedure (IP failover) for switching the logical IP address when the operation is stopped will be described with reference to FIG.

  First, when the first-system local network GW device 1a for the first local network 301 goes down (step S401), the second inter-GW mode monitoring unit 15b in the second Internet GW for the first local network 301 is turned off. The disconnection of the IP mode communication is detected (step S402).

  The second inter-GW mode monitoring unit 15b in the first Internet GW apparatus 2b for the first local net 301 notifies the second mode determination unit 17b of disconnection of non-IP mode communication. The second mode determination unit 17b receives the disconnection notification and sets the second mode state holding unit 18b to be a slave (step S403). The second two-system mode monitoring unit 16b acquires the slave state from the second mode state holding unit 18b and notifies the second-system Internet GW device 4d (step S404).

The second mode determination unit 17b in the first system Internet GW apparatus 2b acquires the slave state information from the second mode state holding unit 18b and passes it to the second system mode monitoring unit 19b. The second intra-system mode monitoring unit 19b transmits the received slave change notification to the first Internet GW apparatus 2b for the second local network 302 (step S418).
The fourth intra-system mode monitoring unit 19a in the second-system Internet GW device 4d for the first local network 301 receives the notification from the first-system Internet GW device 2b and passes it to the fourth mode determination unit 17d ( Step S407). The fourth mode determination unit 17d in the second Internet GW apparatus 4d receives the master change notification and sets the fourth mode state holding unit 18d to be a master (step S408).

  The fourth inter-GW mode monitoring unit 15d in the second-system Internet GW device 4d for the first local net 301 acquires the master state from the fourth mode state holding unit 18d, and the second-system local net GW device. 3c is notified (step S409).

  The fourth mode determination unit 17d in the second system Internet GW apparatus 4d acquires the master state from the fourth mode state holding unit 18d and passes it to the fourth system mode monitoring unit 19d. The fourth intra-system mode monitoring unit 19d transmits a master change notification to the second Internet GW apparatus 4d for the second local net 302 (Step S412).

  The third inter-system mode monitoring unit 16c in the second-system local net GW device 3c for the first local net 301 detects that the heartbeat communication has been disconnected and notifies the third mode determination unit 17c. (Step S405). The third mode determination unit 17c sets a master in the third mode state holding unit 18c, and waits for a master change notification from the second Internet GW apparatus 4d (step S406).

  The third inter-GW mode monitoring unit 15c receives the master change notification from the second Internet GW apparatus 4d and passes it to the third mode determination unit 17c (step S410). The third mode determination unit 17c notifies the third logical IP address setting cancellation unit 14c that the master mode has been changed. The third logical IP address setting cancellation unit 14c sets a logical IP for the third LAN port 20c (step S411).

  The fourth intra-system mode monitoring unit 19d in the second system Internet GW apparatus 4d for the second local net 302 receives the master change notification from the second system Internet GW apparatus 4d for the first local net 301, and 4 to the mode determination unit 17d (step S413). The fourth mode determination unit 17d receives the master change notification and sets the master in the fourth mode state holding unit 18d (step S414).

  The fourth inter-GW mode monitoring unit 15d in the second-system Internet GW device 4d for the second local net 302 acquires the master state from the fourth mode state holding unit 18d, and the second-system local net GW device. 3c is notified (step S415).

  The third inter-GW mode monitoring unit 15c in the second-system local net GW device 3c for the second local net 302 receives the master change notification from the second-system Internet GW device 4d and receives the third mode determination unit 17c. (Step S416). The third mode determination unit 17c sets the third mode state holding unit 18c as a master, and notifies the third logical IP address setting cancellation unit 14c that it has been changed to the master. The third logical IP address setting cancellation unit 14c sets a logical IP for the third LAN port 20c (step S417).

  The second intra-system mode monitoring unit 19b in the first system Internet GW apparatus 2b for the second local net 302 receives the slave change notification from the first system Internet GW apparatus 2b for the first local net 301, and The data is transferred to the second mode determination unit 17b for the second local net 302 (step S419). The second mode determination unit 17b receives the slave change notification and sets the slave in the second mode state holding unit 18b (step S420).

  The second inter-GW mode monitoring unit 15b acquires the slave state from the second mode state holding unit 18b and notifies the first local network GW device 1a for the second local net 302 (step S421). The third inter-GW mode monitoring unit 15c in the first-system local net GW device 1a for the second local network 302 receives the slave change notification from the second-system Internet GW device 4d, and receives a third mode determination unit. 17c (step S422). The third mode determination unit 17c receives the slave change notification, sets the slave in the first mode state holding unit 18a for the second local net 302, and sets the slave in the first logical IP address setting release unit 14a. The slave is notified of the change (step S423).

  The first logical IP address setting release unit 14a in the first system local net GW apparatus 1a for the second local net 302 releases the logical IP of the first LAN port 20a for the first local net 301 (step). S424).

  Thereby, the logical IP address can be switched from the first system GW apparatus 5 to the second system GW apparatus 6.

  Next, the logic when the mode state of the first system GW device 5 of the first local net 301 and the first system GW device 5 of the second local net 302 is both master and the first system Internet GW device 2b is stopped. The procedure for switching IP addresses (IP failover) will be described with reference to FIG.

  First, when the first-system Internet GW apparatus 2b of the first local net 301 is stopped (step S501), the first inter-GW mode monitoring unit 15a for the first local net 301 detects disconnection of non-IP communication, and 1 mode determination unit 17a is notified (step S502). The first mode determination unit 17a receives the disconnection notification and sets a slave in the first mode state holding unit 18a (step S503).

  The first two-system mode monitoring unit 16a for the first local net 301 acquires the slave state from the first mode state holding unit 18a, and the second system local net GW device 3c for the first local net 301 is obtained. (Step S504).

  The third inter-system mode monitoring unit 16c in the first-system local net GW device 1a for the first local net 301 receives the notification from the first-system local net GW device 1a, and receives a third mode determination unit. 17c (step S507). The third mode determination unit 17c receives the master change notification, sets the master in the third mode state holding unit 18c, and receives the master change notification from the second Internet GW apparatus 4d for the first local network 301. Is waited for (step S508).

  The third inter-GW mode monitoring unit 15c in the second-system local network GW device 3c for the first local network 301 receives the master change notification from the second-system Internet GW device 4d, and receives a third mode determination unit. 17c (step S509). The third mode determining unit 17c notifies the third logical IP address setting canceling unit 14c that the master has been changed, and the third logical IP address setting canceling unit 14c is connected to the third LAN port 20c. A logical IP is set (step S510).

  The fourth inter-system mode monitoring unit 16d in the second-system Internet GW device 4d for the first local network 301 detects that the heartbeat communication has been disconnected and notifies the fourth mode determination unit 17d. (Step S505). The fourth inter-system mode monitoring unit 16d sets the master in the fourth mode state holding unit 18d (step S506). The fourth inter-GW mode monitoring unit 15d acquires the master from the fourth mode state holding unit 18d and notifies the second local network GW apparatus 3c (step S511).

  The fourth mode determination unit 17d acquires the master state from the fourth mode state holding unit 18d and passes it to the fourth in-system mode monitoring unit 19d. The fourth in-system mode monitoring unit 19d The notification is transmitted to the second Internet GW apparatus 4d for the second local network 302 (step S512).

  The fourth intra-system mode monitoring unit 19d in the second system Internet GW apparatus 4d for the second local net 302 receives the master change notification from the fourth intra-system mode monitoring unit 19d for the first local net 301. Then, the data is transferred to the fourth mode determination unit 17d for the second local net 302 (step S513). The fourth mode determination unit 17d receives the master change notification and sets the master in the fourth mode state holding unit 18d (step S514).

  The fourth inter-GW mode monitoring unit 15d in the second-system Internet GW device 4d for the second local net 302 acquires the master state from the fourth mode state holding unit 18d, and The second system local net GW apparatus 3c is notified (step S515).

  The third inter-GW mode monitoring unit 15c in the second-system local network GW device 3c for the second local network 302 receives the master change notification from the second-system Internet GW device 4d, and receives the master change notification for the second local network 302. It passes to the 3rd mode determination part 17c (step S516). The third mode determination unit 17c sets the master in the third mode state holding unit 18c, notifies the third logical IP address setting cancellation unit 14c that the master has been changed, and notifies the third logic state determination unit 17c. The IP address setting cancellation unit 14c sets a logical IP for the third LAN port 20c (step S517).

  The second intra-system mode monitoring unit 19b in the first system Internet GW apparatus 2b for the second local net 302 performs intra-system mode communication with the second intra-system mode monitoring unit 19b for the first local net 301. Disconnection is detected and notified to the second mode determination unit 17b (step S518). The second mode determination unit 17b receives a notification of disconnection of the mode communication and sets a slave in the second mode state holding unit 18b (step S519). The second inter-GW mode monitoring unit 15b acquires the slave state from the second mode state holding unit 18b and notifies the first local network GW apparatus 1a (step S520).

  The first inter-GW mode monitoring unit 15a in the first system local net GW device 1a for the second local net 302 receives the slave change notification from the first system Internet GW device 2b, and receives the first mode determination unit. 17a (step S521). The first mode determination unit 17a receives the slave change notification, sets the slave in the first mode state holding unit 18a, and notifies the first logical IP address setting cancellation unit 14a that the slave has been changed. (Step S522). The first logical IP address setting cancellation unit 14a cancels the logical IP of the third LAN port 20c (step S523).

  Thereby, the logical IP address can be switched from the first system GW apparatus 5 to the second system GW apparatus 6.

  Next, when the first-system Internet GW device 2b for the first local network 301 is stopped and the second-system GW device 6 has undergone an IP failover, the first-system GW device 5 is set as the master again. Next, the procedure for switching the logical IP address will be described with reference to FIG.

  After the first-system Internet GW device 2b of the first local net 301 is stopped and an IP failover occurs in the second-system GW device 6, the first-system Internet GW device 2b is restarted by the user (step S601). ). At this time, the first and second non-IP transmission / reception units 13a and 13b and the first and second inter-GW mode monitoring units 15a and 15b start non-IP communication, and the first and third The two-system mode monitoring units 16a and 16c start heartbeat communication (step S602).

  In order to make the first system GW device 5 a master again, a slave transition request is made to the third mode determination unit 17c of the second system local network GW device 3c (step S603). The third mode determination unit 17c receives the slave transition request and sets the slave in the third mode state holding unit 18c. The third inter-GW mode monitoring unit 15c acquires the slave state from the third mode state holding unit 18c and notifies the second internet GW device 4d (step S604).

  The fourth inter-GW mode monitoring unit 15d in the second-system Internet GW device 4d for the first local network 301 receives the slave change notification from the first-system local network GW device 1a, and receives the fourth mode determination unit. 17d (step S607). The fourth mode determination unit 17d receives the slave change notification and sets the slave in the fourth mode state holding unit 18d (step S608).

  The fourth inter-system mode monitoring unit 16d in the second-system Internet GW device 4d acquires the slave state from the fourth mode state holding unit 18d and notifies the first-system Internet GW device 2b (step S609). ).

  The fourth mode determination unit 17d in the second system Internet GW apparatus 4d acquires the slave state from the fourth mode state holding unit 18d and passes it to the fourth system mode monitoring unit 19d. The fourth intra-system mode monitoring unit 19d transmits a slave change notification to the second Internet GW apparatus 4d for the second local net 302 (Step S610).

  The second inter-system mode monitoring unit 16b in the first-system Internet GW apparatus 2b for the first local network 301 receives the slave change notification from the second-system Internet GW apparatus 4d, and receives the second mode determination unit 17b. (Step S611). The second mode determination unit 17b receives the slave change notification and sets the master in the second mode state holding unit 18b (step S612).

  The second inter-GW mode monitoring unit 15b in the first system Internet GW apparatus 2b acquires the master state from the second mode state holding unit 18b and notifies the first system local network GW apparatus 1a (step S613). ).

  The second mode determination unit 17b in the first system Internet GW apparatus 2b acquires the slave state from the second mode state holding unit 18b and passes it to the second system mode monitoring unit 19b. The second intra-system mode monitoring unit 19b transmits a slave change notification to the first Internet GW apparatus 2b for the second local net 302 (step S614).

  The first inter-two-system mode monitoring unit 16a in the first-system local net GW apparatus 1a for the first local net 301 receives the slave change notification from the second-system local net GW apparatus 3c, and receives the first mode. It passes to the determination part 17a (step S605). The first mode determination unit 17a receives the slave change notification, sets the master in the first mode state holding unit 18a, and waits for the master change notification to be received from the first Internet GW apparatus 2b (Step S1). S606).

  The first inter-GW mode monitoring unit 15a in the first system local network GW apparatus 1a receives the master change notification from the first system Internet GW apparatus 2b and passes it to the first mode determination unit 17a (step S615). . The first mode determination unit 17a notifies the first logical IP address setting release unit 14a that the master has been changed, and the first logical IP address setting release unit 14a receives the first LAN port 20a. The logical IP is set to (step S616).

  The fourth intra-system mode monitoring unit 19d in the second-system Internet GW apparatus 4d for the second local net 302 receives the slave change notification from the second-system Internet GW apparatus 4d for the first local net 301, and It passes to the 4th mode determination part 17d (step S617). The fourth mode determination unit 17d receives the slave change notification and sets the slave in the fourth mode state holding unit 18d (step S618).

  The fourth inter-GW mode monitoring unit 15d in the second-system Internet GW device 4d for the second local net 302 acquires the slave state from the fourth mode state holding unit 18d, and obtains the second-system local net GW device. 3c is notified (step S619).

  The third inter-GW mode monitoring unit 15c in the second-system local network GW device 3c receives the slave change notification from the second-system Internet GW device 4d and passes it to the third mode determination unit 17c (step S620). . The third mode determination unit 17c sets a slave in the third mode state holding unit 18c, and notifies the third logical IP address setting cancellation unit 14c that the slave has been changed (step S621). The third logical IP address setting releasing unit 14c releases the logical IP of the third LAN port 20c (step S622).

  The second intra-system mode monitoring unit 19b in the first system Internet GW apparatus 2b for the second local net 302 receives the master change notification from the first system Internet GW apparatus 2b for the first local net 301, and The data is transferred to the second mode determination unit 17b for the second local net 302 (step S623). The second mode determination unit 17b receives the master change notification and sets the master in the second mode state holding unit 18b (step S624).

  The second inter-GW mode monitoring unit 15b in the first system Internet GW device 2b for the second local net 302 acquires the master from the second mode state holding unit 18b, and the first system local network GW device 1a. (Step S625). The first inter-GW mode monitoring unit 15a in the first system local network GW apparatus 1a receives the master change notification from the first system Internet GW apparatus 2b and passes it to the first mode determination unit 17a (step S626). ). The first mode determination unit 17a receives the master change notification, sets the master in the first mode state holding unit 18a, and notifies the first logical IP address setting release unit 14a that the master has been changed. (Step S627). The first logical IP address setting cancellation unit 14a sets a logical IP for the third LAN port 20c (step S628).

  Thereby, the logical IP address can be switched from the second system GW apparatus 6 to the first system GW apparatus 5.

  Here, even when the third mode determination unit 17c is requested to stop in step S603 in FIG. 6 and “undecided” is set in the third mode state holding unit 18c in step S604, It is possible to switch the logical IP address.

  As can be seen from the above description, according to the present embodiment, it is possible to prevent packets unnecessary for the Internet 304 from being sent to the local nets 301, 302, and 303 via the Internet 304. Thereby, a plurality of local nets can communicate only data packets to be communicated.

  In addition, an application that performs communication in the local nets 301, 302, and 303 can continue communication even when a redundant communication path system is switched.

  Therefore, it is possible to improve the safety and confidentiality of a communication device that connects a plurality of local nets 301, 302, and 303 via the Internet 304.

  In this embodiment, there are two ports, that is, a LAN port and a two-system mode monitoring port.

  For these ports, the inter-system mode monitoring port may be assigned to a port different from the LAN port. Further, the two-system mode monitoring ports, for example, the first and third two-system mode monitoring ports 21a and 21c can be directly connected by cross connection, for example, serial connection is also possible. Even when communication between the LAN ports is interrupted, the mode monitoring by the two-system mode monitoring unit can be performed.

  This enables highly reliable heartbeat communication regardless of the communication state of the LAN port, such as an increase in packet transfer load, thereby improving the quality of mode management.

  In addition, the LAN port may be configured to have a function of a two-system mode monitoring port. In this case, the connection between the two-system mode monitoring ports, for example, the first and third two-system mode monitoring ports 21a and 21c are performed by LAN connection.

  Thereby, even when only one LAN port is provided, heartbeat communication is possible. Thus, the cost for configuring the GW can be reduced.

  When the inter-system mode monitoring port is assigned to a port different from the LAN port, the LAN port may also be used as a heartbeat communication port. In this case, even if the two-system mode monitoring port is disconnected, the heartbeat communication can be performed through the LAN port.

  This makes it possible to perform heartbeat communication with high reliability regardless of the communication state of the LAN port, such as an increase in packet transfer load, and improve the quality of mode management. Furthermore, even if communication of either the LAN port or the inter-system mode monitoring port is interrupted, heartbeat communication can be performed by the other port, so that reliability is further improved.

[Second Embodiment]
A second embodiment of the communication apparatus according to the present invention will be described with reference to FIGS. 2 and 7 to 9.

  FIG. 7 is a block diagram illustrating a configuration of the communication apparatus according to the present embodiment. FIG. 8 shows an outline of an example procedure for eliminating the split brain when both the first-system local network GW apparatus 1a and the second-system local network GW apparatus 3c are stopped and restarted. It is a flowchart to show. FIG. 9 shows split brain detection after the heartbeat signal between the first system local net GW apparatus 1a and the second system local net GW apparatus 3c is disconnected and communication is restored, and the first system GW apparatus 5 is prioritized. It is a flowchart which shows the procedure which eliminates a split brain by making it into a master automatically.

  In addition, this embodiment is a modification of 1st Embodiment, Comprising: The same code | symbol is attached | subjected to the same part or similar part as 1st Embodiment, and duplication description is abbreviate | omitted. In addition, the communication apparatus according to the present embodiment forms a network system similar to that shown in FIG.

  In the present embodiment, a first split brain recovery setting unit 23a and a third split brain recovery setting unit 23c are provided in each of the first system local net GW apparatus 1a and the second system local net GW apparatus 3c. .

  The first and third split brain recovery setting units 23a and 23c are configured so that when the modes of the first system GW device 5 and the second system GW device 6 both detect the master, Priority information that determines which one continues as a master is input to each of the mode monitoring units 16a and 16c. The priority information is preset by the user in each of the first and third split brain recovery setting units 23a and 23c.

  Each of the first and third inter-system mode monitoring units 16a and 16c of the present embodiment notifies the other party's local net GW of the priority, and when the priority is low, the mode of the local net GW Has the function of changing to a slave.

  The operation of this embodiment will be described. First, a normal operation will be described with reference to FIG.

  First, after the first system local net GW apparatus 1a and the second system local net GW apparatus 3c for the first local net 301 are stopped (steps S801 and S805), they are restarted (steps S802 and S806).

  The first and third inter-system mode monitoring units 16a and 16c start heartbeat communication with each other (steps S803 and S807).

  The first and third inter-system mode monitoring units 16a and 16c obtain master continuation priority information from the first and third split brain recovery setting units 23a and 23c, respectively. That is, the first system and the second system transmit each other (steps S804 and S808).

  The first inter-system mode monitoring unit 16a notifies the first mode determination unit 17a of the priority of the second system (the partner system) and the priority of the first system (the own system), and the first mode The determination unit 17a determines that the priority of the own system is high, and sets the master in the first mode state holding unit 18a. The first inter-GW mode monitoring unit 15a notifies the first-system Internet GW apparatus 2b that it has been changed to the master (step S809).

  The second inter-GW mode monitoring unit 15b of the first system Internet GW apparatus 2b receives the master change notification from the first system local network GW apparatus 1a and notifies the second mode determination unit 17b (step S810). . The second mode determination unit 17b sets the master in the second mode state holding unit 18b, and the second inter-GW mode monitoring unit 15b notifies the first system local network that the mode has been changed to the master. (Step S811).

  The first inter-GW mode monitoring unit 15a in the first system local network GW apparatus 1a receives the master change notification from the first system Internet GW apparatus 2b and notifies the first mode determination unit 17a (step S812). ). The first mode determination unit 17a notifies the first logical IP address setting release unit 14a that the master has been changed, and the first logical IP address setting release unit 14a sends the first LAN port 20a to the first LAN port 20a. A logical IP is set (step S813).

  The first intra-system mode monitoring unit 19a in the first system local net GW apparatus 1a for the first local net 301 acquires the master state from the first mode state holding unit 18a, and is used for the second local net 302. To the first system Internet GW apparatus 2b (step S814).

  The third inter-system mode monitoring unit 16c in the second-system local net GW device 3c for the first local network 301 has a priority of the first system that is the partner system and a priority of the second system that is the own system. The degree is notified to the third mode determination unit 17c. The third mode determination unit 17c determines that the priority of the second system serving as its own system is low, and sets a slave in the third mode state holding unit 18c. The third inter-GW mode monitoring unit 15c notifies the second-system Internet GW apparatus 4d that it has been changed to a slave (step S815).

  The fourth inter-GW mode monitoring unit 15d in the second-system Internet GW device 4d receives the slave change notification from the second-system local network GW device 3c and passes it to the fourth mode determination unit 17d (step S816). . The fourth mode determination unit 17d sets a slave in the fourth mode state holding unit 18d (step S817). The fourth mode determination unit 17d acquires the slave state from the fourth mode state holding unit 18d and passes it to the fourth in-system mode monitoring unit 19d. The fourth in-system mode monitoring unit 19d The slave change notification is transmitted to the second system Internet GW apparatus 4d for the second local net 302 (step S818).

  The fourth intra-system mode monitoring unit 19d in the second-system Internet GW apparatus 4d for the second local net 302 receives the slave change notification from the second-system Internet GW apparatus 4d for the first local net 301, and 2 is passed to the fourth mode determination unit 17d for the local net 302 (step S819). The fourth mode determination unit 17d receives the slave change notification and sets the slave in the fourth mode state holding unit 18d. The fourth inter-GW mode monitoring unit 15d acquires the slave state from the fourth mode state holding unit 18d and notifies the second local net GW device 3c for the second local net 302 (step S820).

  The third inter-GW mode monitoring unit 15c in the second-system local network GW device 3c receives the slave change notification from the second-system Internet GW device 4d and passes it to the third mode determination unit 17c (step S821). . The third mode determination unit 17c sets a slave in the third mode state holding unit 18c (step S822).

  The second intra-system mode monitoring unit 19b in the first system Internet GW apparatus 2b for the second local net 302 receives the master change notification from the first system Internet GW apparatus 2b for the first local net 301, and 2 is passed to the second mode determination unit 17b for the local net 302 (step S823). The second mode determination unit 17b receives the master change notification and sets the master in the second mode state holding unit 18b. The second inter-GW mode monitoring unit 15b acquires the master state from the second mode state holding unit 18b and notifies the first local network GW apparatus 1a (step S824).

  The first inter-GW mode monitoring unit 15a in the first system local network GW apparatus 1a receives the master change from the second system Internet GW apparatus 4d and passes it to the first mode determination unit 17a (step S825). The first mode determination unit 17a sets the master in the first mode state holding unit 18a and notifies the first logical IP address setting cancellation unit 14a that the master has been changed (step S826). The first logical IP address setting release unit 14a sets a logical IP for the first LAN port 20a (step S827).

  Thereby, even if both systems, that is, the first system and the second system are both down, the first system GW can be set as the master, so that the split brain can be eliminated.

  Next, split brain detection after the heartbeat signal between the first system local net GW apparatus 1a and the second system local net GW apparatus 3c is disconnected and communication is restored again, and the first system GW apparatus 5 is given priority. Next, a method for eliminating the split brain as a master will be described with reference to FIG.

  First, the first and third inter-system mode monitoring units 16a and 16c of the first system local net GW apparatus 1a and the second system local net GW apparatus 3c detect the disconnection of the heartbeat communication, and first And the third mode determination units 17a and 17c (steps S901 and S905).

  The third mode determination unit 17c sets the master in the third mode state holding unit 18c based on the notification of disconnection of the heartbeat communication and the slave state acquired from the third mode state holding unit 18c. The IP address setting cancellation unit 14c is notified of the change to the master. The third logical IP address setting cancellation unit 14c sets a logical IP address for the third LAN port 20c. The third inter-GW mode monitoring unit 15c acquires the master state from the third mode state holding unit 18c and notifies the second internet GW device 4d (step S906).

  The fourth inter-GW mode monitoring unit 15d in the second-system Internet GW device 4d receives the master change notification from the second-system local network GW device 3c and passes it to the fourth mode determination unit 17d (step S912). The fourth mode determination unit 17d sets a master in the fourth mode state holding unit 18d (step S913).

  The fourth intra-system mode monitoring unit 19d in the second system Internet GW apparatus 4d acquires the master state from the fourth mode state holding unit 18d, and the second system Internet GW apparatus 4d for the second local network 302 is obtained. (Step S914).

  The fourth intra-system mode monitoring unit 19d in the second-system Internet GW apparatus 4d for the second local net 302 receives the master change notification from the second-system Internet GW apparatus 4d for the first local net 301, and It passes to the 4th mode determination part 17d (step S915). The fourth mode determination unit 17d receives the master change notification and sets the master in the fourth mode state holding unit 18d. The fourth inter-GW mode monitoring unit 15d acquires the master state from the fourth mode state holding unit 18d and notifies the second local network GW device 3c (step S916).

  The third inter-GW mode monitoring unit 15c in the second-system local network GW device 3c receives the master change notification from the second-system Internet GW device 4d and passes it to the third mode determination unit 17c (step S917). ). The third mode determination unit 17c sets the master in the third mode state holding unit 18c, and notifies the third logical IP address setting cancellation unit 14c that the master has been changed (step S918). The third logical IP address setting cancellation unit 14c sets a logical IP for the third LAN port 20c (step S919).

  The first and third inter-system two mode monitoring units 16a and 16c of the first system local net GW apparatus 1a and the second system local net GW apparatus 3c for the first local net 301 detect recovery of heartbeat communication. Then, the communication result is passed to the first and third mode determination units 17a and 17c (steps S902 and S907).

  Each of the first and third mode determination units 17a and 17c detects split brain (steps S903 and S908). Each of the first and third inter-system mode monitoring units 16a and 16c obtains the priority information of the master continuation from the first and third split brain recovery setting units 23a and 23c, respectively. Send to net GW. (Steps S904 and S909).

  The third inter-system mode monitoring unit 16c notifies the third mode determination unit 17c of the priority of the first system serving as the partner system and the priority of the second system serving as the own system. The third mode determination unit 17c determines that the priority of the own system (second system) is low, and sets a slave in the third mode state holding unit 18c. The third inter-GW mode monitoring unit 15c acquires the slave state from the third mode state holding unit 18c, notifies the second internet GW device 4d, and notifies the third logical IP address setting cancellation unit 14c. The slave is notified of the change (step S910). The third logical IP address setting cancellation unit 14c cancels the logical IP of the third LAN port 20c (step S911).

  The fourth inter-GW mode monitoring unit 15d in the second-system Internet GW device 4d receives the slave change notification from the first-system local network GW device 1a and passes it to the fourth mode determination unit 17d (step S920). . The fourth mode determination unit 17d sets a slave in the fourth mode state holding unit 18d (step S921). The fourth intra-system mode monitoring unit 19d acquires the slave state from the fourth mode state holding unit 18d and notifies the second system Internet GW device 4d for the second local network 302 (Step S922).

  The fourth intra-system mode monitoring unit 19d in the second-system Internet GW apparatus 4d for the second local net 302 receives the slave change notification from the second-system Internet GW apparatus 4d for the first local net 301, and 4 to the mode determination unit 17d (step S923). The fourth mode determination unit 17d receives the slave change notification and sets the slave in the fourth mode state holding unit 18d. The fourth inter-GW mode monitoring unit 15d acquires the slave state from the fourth mode state holding unit 18d and notifies the second local network GW apparatus 3c (step S924).

  The third inter-GW mode monitoring unit 15c of the second-system local network GW device 3c receives the slave change notification from the second-system Internet GW device 4d and passes it to the third mode determination unit 17c (step S925). . The third mode determination unit 17c sets a slave in the third mode state holding unit 18c, and notifies the third logical IP address setting cancellation unit 14c that the slave has been changed (step S926). The third logical IP address setting cancellation unit 14c releases the logical IP from the third LAN port 20c (step S927).

  As a result, when the heartbeat communication is restored, the split brain can be eliminated with the first GW apparatus 5 as the master.

  As can be seen from the above description, according to the present embodiment, even if a split brain occurs temporarily, the GW as the master is preferentially set in advance, so the communication path is kept constant.

  Thereby, for example, communication between GWs of higher priority systems can be assigned a high speed line, and communication between GWs of lower priority levels can be assigned a low speed line. By using a low-speed line as a backup line, the cost associated with the wide area communication network when constructing the system can be reduced.

[Third Embodiment]
A third embodiment of the communication apparatus according to the present invention will be described with reference to FIGS. 2 and 10 to 12.

  FIG. 10 is a block diagram showing the configuration of the communication apparatus of this embodiment. FIG. 11 is a flowchart showing an overview of the split brain elimination procedure when both the GWs of FIG. 10 are stopped and then restarted. FIG. 12 is a flowchart showing an overview of the split brain elimination procedure when the heartbeat communication between the first and second system GW devices 6 of FIG. 10 is restored.

  In addition, this embodiment is a modification of 1st Embodiment, Comprising: The same code | symbol is attached | subjected to the same part or similar part as 1st Embodiment, and duplication description is abbreviate | omitted. In addition, the communication apparatus according to the present embodiment forms a network system similar to that shown in FIG.

  In the present embodiment, in addition to the first embodiment of FIG. 1, the first master local time GW device 1 a and the second local network GW device 3 c have the first master transition time setting unit 24 a and the third The master transition time setting unit 24c is provided.

  The first and third master transition time setting units 24a and 24c are configured so that the first and third mode state holding units 18a and 18c are set when the first and third mode determination units 17a and 17c respectively set the master. Each has a function of recording the master transition time. The master transition time is reset when transitioning to the slave.

  The first and third inter-system mode monitoring units 16a and 16c notify each other's local network GW of the master transition time, and make the GW that has transitioned to the master at a later time out of the two systems as a slave. change.

  Next, the operation of this embodiment will be described. First, normal operation will be described with reference to FIG.

  When the first system local network GW apparatus 1a and the second system local network GW apparatus 3c are both stopped and restarted to recover, the split brain after the first system GW apparatus 5 is started first and transitions to the master A method for eliminating the split brain when the image is detected will be described with reference to FIG. Note that mode synchronization between the first system GW apparatus 5 and the second system is the same as in the second embodiment.

  First, the first system local net GW apparatus 1a and the second system local net GW apparatus 3c for the first local net 301 are stopped (steps S1101 and S1107) and restarted (steps S1102 and S1108). Each of the first two-system mode monitoring unit 16a and the third two-system mode monitoring unit 16c starts heartbeat communication (steps S1103 and S1109).

  Since the first and third mode determination units 17a and 17c for the first local net 301 are not established with each other, a master is set in each of the first and third mode state holding units 18a and 18c. Thus, the first and third master transition time setting units 24a and 24c are notified of the transition to the master. Each of the first and third master transition time setting units 24a and 24c registers the master transition time in each of the first and third mode state holding units 18a and 18c. The first and third inter-GW mode monitoring units 15a and 15c obtain the master state from the first and third mode state holding units 18a and 18c, respectively, and obtain the first system Internet GW device 2b and the second system Internet. Each GW apparatus 4d is notified (steps S1104 and S1112).

  Each of the second inter-GW mode monitoring unit 15b in the first Internet GW apparatus 2b and the fourth inter-GW mode monitoring unit 15d in the second Internet GW apparatus 4d receives the master change notification, and receives the second and Each of the fourth mode determination units 17b and 17d is notified (steps S1110 and S1116). Each of the second and fourth mode determination units 17b and 17d sets a master in the second and fourth mode state holding units 18b and 18d (steps S1111 and S1117).

  The first inter-system mode monitoring unit 16a in the first system local net GW device 1a and the third inter-system mode monitoring unit 16c in the second system local net GW device 3c each provide a heartbeat communication result, It passes to each of the first and third mode determination units 17a and 17c, and split brain is detected (steps S1105 and S1113).

  Each of the first and third inter-system mode monitoring units 16a and 16c acquires the master transition time from each of the first and third mode state holding units 18a and 18c, and transmits it to the local net GW of the counterpart system. (Steps S1106, S1114).

  The third inter-system mode monitoring unit 16c notifies the third mode determination unit 17c that the master transition time of the own system (second system) is a new time. The third mode determination unit 17c sets a slave in the third mode state holding unit 18c. The third inter-GW mode monitoring unit 15c acquires the slave state from the third mode state holding unit 18c and notifies the second internet GW device 4d (step S1115).

  The fourth inter-GW mode monitoring unit 15d in the second Internet GW apparatus 4d receives the slave change notification and notifies the fourth mode determination unit 17d (step S1118). The fourth mode determination unit 17d sets a slave in the fourth mode state holding unit 18d (step S1119).

  As a result, when both systems go down at the same time, the split brain can be eliminated by using the first system GW that has previously transitioned to the master as the master as it is.

  Next, split brain detection after the first system GW device 5 is the master and the heartbeat communication between the first system local net GW device 1a and the second system local net GW device 3c is disconnected and communication is restored again. A split brain elimination method that continues with the first GW as the master will be described with reference to FIG.

  First, each of the first and third inter-system mode monitoring units 16a and 16c detects the disconnection of the heartbeat communication, and notifies each of the first and third mode determination units 17a and 17c (steps S1201 and S1205). ).

  The third mode determination unit 17c sets the master in the third mode state holding unit 18c based on the disconnection notification of the heartbeat communication and the slave state acquired from the third mode state holding unit 18c. The transition time setting unit 24c is notified of the transition to the master. The third master transition time setting unit 24c registers the master transition time in the third mode state holding unit 18c, and notifies the third logical IP address setting cancellation unit 14c that the master has been changed to the master. The third logical IP address setting cancellation unit 14c sets a logical IP address for the third LAN port 20c. The third inter-GW mode monitoring unit 15c acquires the master state from the third mode state holding unit 18c and notifies the second internet GW device 4d (step S1206).

  The fourth inter-GW mode monitoring unit 15d in the second-system Internet GW device 4d receives the master change notification from the second-system local network GW device 3c and passes it to the fourth mode determination unit 17d (step S1212). . The fourth mode determination unit 17d sets the master in the fourth mode state holding unit 18d (step S1213).

  The first inter-two-system mode monitoring unit 16a in the first system local net GW apparatus 1a detects the recovery of the heartbeat communication, and passes the communication result to the first mode determination unit 17a (step S1202). The first mode determination unit 17a detects split brain (step S1203). Similarly, the second system local net GW apparatus 3c detects the split brain (steps S1207 and S1208).

  Each of the first and third inter-system mode monitoring units 16a and 16c acquires the master transition time from each of the first and third mode state holding units 18a and 18c, and transmits the master transition time to each other GW. (Steps S1204 and S1209).

  The third inter-system mode monitoring unit 16c notifies the third mode determination unit 17c of the master transition time of the partner system (first system) and the master transition time of the own system (second system). The third mode determination unit 17c determines that the master (second system) master transition time is later, and sets the slave in the third mode state holding unit 18c. The third inter-GW mode monitoring unit 15c acquires the slave state from the third mode state holding unit 18c and notifies the second Internet GW. The third mode determining unit 17c notifies the third logical IP address setting canceling unit 14c that it has been changed to a slave (step S1210).

  The third logical IP address setting cancellation unit 14c cancels the logical IP of the third LAN port 20c (step S1211).

  The fourth inter-GW mode monitoring unit 15d in the second-system Internet GW receives the slave change notification from the first-system local network GW device 1a and passes it to the fourth mode determination unit 17d (step S1220). The fourth mode determination unit 17d sets a slave in the fourth mode state holding unit 18d (step S1221).

  As a result, when a failure occurs in heartbeat communication, the split brain can be eliminated by using the first system GW that has previously transitioned to the master as it is as the master.

  As can be seen from the above description, according to the present embodiment, when the split brain is eliminated, logical IP is not reassigned, so that the split brain can be eliminated earlier than in the second embodiment. It becomes possible.

[Fourth Embodiment]
A fourth embodiment of the communication apparatus according to the present invention will be described with reference to FIGS. 2 and 13 to 15.

  FIG. 13 is a block diagram showing the configuration of the communication apparatus of this embodiment. FIG. 14 is a flowchart showing an outline of a procedure for automatically setting transfer settings between GWs in FIG. 13. FIG. 15 is a flowchart showing an outline of the packet transfer procedure of the present embodiment.

  In addition, this embodiment is a modification of 1st Embodiment, Comprising: The same code | symbol is attached | subjected to the same part or similar part as 1st Embodiment, and duplication description is abbreviate | omitted. In addition, the communication apparatus according to the present embodiment forms a network system similar to that shown in FIG.

  In the present embodiment, in addition to the first embodiment of FIG. 1, the first system local net GW apparatus 1a, the first system Internet GW apparatus 2b, the second system local net GW apparatus 3c, and the second system Internet GW apparatus. Each of 4d has a first inter-GW transfer setting notification unit 25a, a second inter-GW transfer setting notification unit 25b, a third inter-GW transfer setting notification unit 25c, and a fourth inter-GW transfer setting notification unit 25d. is doing.

  Furthermore, a second transfer setting monitoring unit 26b and a fourth transfer setting monitoring unit 26d are provided in each of the first internet GW device 2b and the second internet GW device 4d.

  The first inter-GW transfer setting notification unit 25a sets the transfer setting of the first transferable packet setting unit 11a in the first system local net GW apparatus 1a via the first system non-IP communication path 22a. A function of notifying the system Internet GW apparatus 2b.

  The second inter-GW transfer setting notification unit 25b has a function of inputting the transfer setting received from the first system local net GW apparatus 1a to the second transferable packet setting unit 11b. Also, the second inter-GW transfer setting notification unit 25b transfers the transfer setting acquired from the second transferable packet setting unit 11b to a different local network, for example, the first Internet GW apparatus 2b belonging to the second local net 302. It has a function to transmit.

  The second inter-GW transfer setting notification unit 25b in the first-system Internet GW device 2b for the second local net 302 has a function of inputting the transmitted transfer setting to the second transferable packet setting unit 11b. .

  The second transfer setting monitoring unit 26b has a function of storing transfer settings in the second transferable packet setting unit 11b.

  Also for the second system GW device 6, the third and fourth inter-GW transfer setting notification unit 25 d and the fourth transfer setting monitoring unit 26 d have the same functions as the first system GW device 5.

  Next, the normal operation of the communication device according to the present embodiment will be described.

  First, the first transferable packet setting unit 11a in the first system local net GW apparatus 1a for the first local net 301 and the first in the first system local net GW apparatus 1a for the second local net 302 are shown. Each of the transferable packet setting units 11a stores the packet transfer setting (steps S1401 and S1406). In addition, in FIG. 14, since the flowchart in GW of a master is shown, the 1st system and the 2nd system are not distinguished. When configuring a dual system, it is preferable to store packet transfer settings in the first system and the second system, respectively.

  The first inter-GW transfer setting notifying unit 25a in the first system local net GW device 1a for the first local net 301 acquires the transfer setting from the first transferable packet setting unit 11a and uses the first system. The first system GW apparatus 2b is notified via the non-IP communication path 22a (step S1402).

  The second inter-GW transfer setting notification unit 25b in the first-system Internet GW apparatus 2b receives the transfer setting from the first-system local net GW apparatus 1a and passes it to the second transfer setting monitoring unit 26b (step S1403). . The second transfer setting monitoring unit 26b stores the transfer setting in the second transferable packet setting unit 11b (step S1405).

  The second transfer setting monitoring unit 26b in the first system Internet GW apparatus 2b for the second local net 302 receives the transfer setting notified from the first system Internet GW apparatus 2b for the first local net 301 ( In step S1407), the transfer setting is stored in the second transferable packet setting unit 11b (step S1408).

  Thereby, for example, the Internet GW for the first local network 301 is automatically recognized as to which Internet GW should be transmitted.

  In the example of FIG. 15, packet transfer is performed from the first computer 101 in the first local net 301 to the second computer 102 in the second local net 302 as in the example of FIG. 3 of the first embodiment. In the example of FIG. 3, transfer settings are stored in each GW device (steps S301 to S304). However, in this embodiment, packets can be transferred without performing these steps.

  As can be seen from the above description, according to the present embodiment, the transfer setting of one local net GW can be shared among a plurality of Internet GWs. Thereby, it is possible to recognize in advance which Internet GW the packet transferred from the local network GW should be transferred to, and the user only needs to be aware of the transmission / reception of the packet between the local networks.

  Even when another local network is added, it is possible to flexibly cope with a change in the network configuration using the wide area network by automatically recognizing the transfer setting between the Internet GWs.

[Other Embodiments]
The description of the above embodiment is an example for explaining the present invention, and does not limit the invention described in the claims. Moreover, each part structure of this invention is not restricted to the said embodiment, A various deformation | transformation is possible within the technical scope as described in a claim.

  For example, the logical IP address setting cancellation unit may set the logical IP address not only when the mode acquired from the mode determination unit is a master but also when the mode is a slave.

  For example, when the first GW apparatus 5 is set as a slave in the procedure of switching the logical IP address in FIG. 4 (step S424), a new logical IP address is set without releasing the logical IP address. As a result, the line type can be specified by the logical IP address.

  By automatically switching not only the logical IP address for the master mode but also the logical IP address for the slave mode, data can be transmitted through a route independent of the main line, and the communication quality is constant regardless of the load on the main line. be able to.

  In other words, not only the logical IP address for the master but also the logical IP address for the slave is automatically switched, so that data can be transmitted through a route independent of the main line, and the communication quality is constant regardless of the load on the main line. It becomes possible.

  DESCRIPTION OF SYMBOLS 1a ... 1st system local net GW apparatus, 2b ... 1st system internet GW apparatus, 3c ... 2nd system local net GW apparatus, 4d ... 2nd system internet GW apparatus, 5 ... 1st system GW apparatus, 6 ... 2nd System GW apparatus, 11a ... first transferable packet setting unit, 11b ... second transferable packet setting unit, 11c ... third transferable packet setting unit, 11d ... fourth transferable packet setting unit, 12a ... 1st IP transmission / reception part, 12b ... 2nd IP transmission / reception part, 12c ... 3rd IP transmission / reception part, 12d ... 4th IP transmission / reception part, 13a ... 1st non-IP transmission / reception part, 13b ... 2nd non- IP transmitting / receiving unit, 13c ... third non-IP transmitting / receiving unit, 13d ... fourth non-IP transmitting / receiving unit, 14a ... first logical IP address setting canceling unit, 14c ... third logical IP address setting canceling unit, 15a ... First Inter-W mode monitoring unit, 15b ... second inter-GW mode monitoring unit, 15c ... third inter-GW mode monitoring unit, 15d ... fourth inter-GW mode monitoring unit, 16a ... first inter-two-mode monitoring unit , 16b: second inter-system mode monitoring unit, 16c: third inter-system mode monitoring unit, 16d: fourth inter-system mode monitoring unit, 17a: first mode determination unit, 17b: second Mode determining unit, 17c ... third mode determining unit, 17d ... fourth mode determining unit, 18a ... first mode state holding unit, 18b ... second mode state holding unit, 18c ... third mode state Holding unit, 18d ... fourth mode state holding unit, 19b ... second in-system mode monitoring unit, 19d ... fourth in-system mode monitoring unit, 20a ... first LAN port, 20b ... second LAN port 20c ... third LAN port, 20d ... fourth LAN 21a... First 2 system mode monitoring port, 21b. 2nd 2 system mode monitoring port, 21c. 3rd 2 system mode monitoring port, 21d. 4th 2 system mode monitoring port 22a ... non-IP communication path for the first system, 22c ... non-IP communication path for the second system, 23a ... first split brain recovery setting section, 23c ... third split brain recovery setting section, 24a ... first Master transition time setting unit, 24c ... third master transition time setting unit, 25a ... first inter-GW transfer setting notification unit, 25b ... second inter-GW transfer setting notification unit, 25c ... third inter-GW transfer setting Notifying unit, 25d ... fourth inter-GW transfer setting notifying unit, 26b ... second transfer setting monitoring unit, 26d ... fourth transfer setting monitoring unit, 301 ... first local net, 302 ... second local net, 303 ... the third local net, 304 ... Internet, 101 ... 1st computer, 102 ... 2nd computer, 103 ... 3rd computer

Claims (2)

A communication device for connecting a plurality of local communication networks via a wide area network,
Each of the local communication networks is connected with a gateway for the local communication network capable of IP communication with each of the local communication networks.
Each gateway before Ki構 communication network, is connected communicatively configured gateway for wide area network to each other by the gateway respectively and non-IP communication means for the front Ki構 communication network,
Before gateway for Ki構 communication network, the first system local network gateway and the second system local network capable monitor the state of each other can transmit and receive heartbeat signal indicating whether operating normally with each other Including gateway for
Before gateway for Kihiro area network includes a gateway and a second system gateway for the wide area network for the first system wide area network capable of monitoring each other's states are capable of transmitting and receiving the heartbeat signal to each other,
Each of the first local area communication network gateways connected to each of the local area communication networks is configured to be able to communicate with the respective first area wide area network gateway by the non-IP communication means.
Each of the second-system local network gateways connected to the respective local-network networks is configured to be able to communicate with the respective second-system wide-area network gateways by the non-IP communication means.
Each of the first system local area communication network gateway, the first system wide area network gateway, the second system local area communication network gateway, and the second system wide area network gateway,
An IP transmission / reception unit capable of transmitting / receiving an IP packet data signal to / from the wide area network or a private network
A non-IP transmission / reception unit configured to be able to transmit / receive predetermined signal information to / from the IP transmission / reception unit via the non-IP communication unit;
A transferable packet setting unit configured to be able to set the setting information of the predetermined signal information in advance;
Whether the first system and the second system wide area network gateways connected to the same local area communication network or the corresponding first system and second system wide area network gateways are in either mode master or slave. A two-system mode monitoring unit configured to notify and grasp
The first-system and second-system local area network gateways connected to the same local-area communication network and the corresponding first-system and second-system wide-area network gateways are connected to each other via the non-IP communication means. An inter-gateway mode monitoring unit configured to notify and grasp each other's mode status;
An intra-system mode monitoring unit configured to notify and grasp the state of the mode between the first system wide area network gateways or between the second system wide area network gateways;
The results monitored by each of the two-system mode monitoring unit and the inter-gateway mode monitoring unit are input, and the first system local area network gateway, the first system wide area network gateway, the second system local area network gateway, And a mode determination unit configured to determine the mode of each of the gateways for the second system wide area network to the predetermined mode while comparing with the state of the mode of each other,
A mode state holding unit that holds the state of the mode determined by the mode determination unit;
I have a,
Each of the first system and second system local area communication network gateways,
Decide which of the first system and second system local communication network gateway should be the master when restoring the split brain that becomes the master when the first system and second system local communication network gateway is the same A split-brain recovery setting unit in which priority information is input in advance,
When the heartbeat signals transmitted and received by the second system mode monitoring unit of each of the first system and second system local area communication network gateways are determined to be stopped,
After the mode determination unit of each of the first-system and second-system local area communication network gateways becomes the master for each of the first-system and second-system local area network gateways, the heartbeat signal is restored, When it is determined that the two inter-system mode monitoring units have become masters of each other,
The mode determination unit of each of the first-system and second-system local area communication network gateways obtains the priority information from the split-brain recovery setting unit, compares the priority information with each other, A communication apparatus configured to maintain a master at a higher level and to transition to a slave at a lower priority level . A communication device for connecting a plurality of local communication networks via a wide area network,
Each of the local communication networks is connected with a gateway for the local communication network capable of IP communication with each of the local communication networks.
Each gateway before Ki構 communication network, is connected communicatively configured gateway for wide area network to each other by the gateway respectively and non-IP communication means for the front Ki構 communication network,
Before gateway for Ki構 communication network, the first system local network gateway and the second system local network capable monitor the state of each other can transmit and receive heartbeat signal indicating whether operating normally with each other Including gateway for
Before gateway for Kihiro area network includes a gateway and a second system gateway for the wide area network for the first system wide area network capable of monitoring each other's states are capable of transmitting and receiving the heartbeat signal to each other,
Each of the first local area communication network gateways connected to each of the local area communication networks is configured to be able to communicate with the respective first area wide area network gateway by the non-IP communication means.
Each of the second-system local network gateways connected to the respective local-network networks is configured to be able to communicate with the respective second-system wide-area network gateways by the non-IP communication means.
Each of the first system local area communication network gateway, the first system wide area network gateway, the second system local area communication network gateway, and the second system wide area network gateway,
An IP transmission / reception unit capable of transmitting / receiving an IP packet data signal to / from the wide area network or a private network
A non-IP transmission / reception unit configured to be able to transmit / receive predetermined signal information to / from the IP transmission / reception unit via the non-IP communication unit;
A transferable packet setting unit configured to be able to set the setting information of the predetermined signal information in advance;
Whether the first system and the second system wide area network gateways connected to the same local area communication network or the corresponding first system and second system wide area network gateways are in either mode master or slave. A two-system mode monitoring unit configured to notify and grasp
The first-system and second-system local area network gateways connected to the same local-area communication network and the corresponding first-system and second-system wide-area network gateways are connected to each other via the non-IP communication means. An inter-gateway mode monitoring unit configured to notify and grasp each other's mode status;
An intra-system mode monitoring unit configured to notify and grasp the state of the mode between the first system wide area network gateways or between the second system wide area network gateways;
The results monitored by each of the two-system mode monitoring unit and the inter-gateway mode monitoring unit are input, and the first system local area network gateway, the first system wide area network gateway, the second system local area network gateway, And a mode determination unit configured to determine the mode of each of the gateways for the second system wide area network to the predetermined mode while comparing with the state of the mode of each other,
A mode state holding unit that holds the state of the mode determined by the mode determination unit;
I have a,
Each of the first-system and second-system local area communication network gateways has a master transition time setting unit capable of storing time information of transition to the master,
When the heartbeat signals transmitted and received by the second system mode monitoring unit of each of the first system and second system local area communication network gateways are determined to be stopped,
After the mode determination unit of each of the first-system and second-system local area communication network gateways becomes the master for each of the first-system and second-system local area network gateways, the heartbeat signal is restored, When it is determined that the two inter-system mode monitoring units have become masters of each other,
The mode determination unit of each of the gateways for the first system and the second system on-site communication network obtains the time when each transitioned to the master from the master transition time setting unit, and compares these times with each other. The communication apparatus is configured such that the earlier one maintains the master and the later one transitions to the slave .

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