JP4820780B2 - Connection destination migration method and connection destination migration system - Google Patents

Description

  The present invention relates to a system migration method and a connection destination migration system from an information providing server in operation to an alternative server.

At present, with the development of computer networks, it consists of a large number (for example, more than one million) of client terminals existing on the network and an information providing server that provides information in response to information requests from such client terminals. A network system exists.
In such a network system, for example, the function provided by the information providing server may be transferred to an alternative server for system specification change, maintenance, version upgrade, and the like.

  At the time of such system transition, for example, if there is no problem even if the system is stopped for a long time, the system may be temporarily stopped and shifted. For example, consider a network system in which an information providing server provides a client terminal with a web page composed of HTML (Hyper Text Markup Language) or the like and browses it using a web browser (hereinafter referred to as a browser). There is a method of transmitting a static web page indicating that maintenance is being performed in response to an information request and transferring the system during the system transition of such an information providing server. Also, there is a method of changing the connection destination using a URL (Uniform Resource Locator) redirect function generally implemented in a Web browser (for example, Non-Patent Document 1).

If the system cannot be stopped for a long time, an alternative server is constructed in advance, and the connection destination from the client terminal is changed to the alternative server, so that the stop time due to system migration can be reduced. In such a case, when access from the client terminal to the information providing server is performed using FQDN (Fully Qualified Domain Name), the setting of the DNS (Domain Name System) server is changed and the FQDN is changed to the FQDN. If the corresponding IP address is changed to the IP address of the alternative server, system migration can be performed without making the user aware of the name resolution processing generally performed by the client terminal (for example, Non-Patent Document 2).
“How to use .htaccess”, [online], [Search May 14, 2007], Internet <http://www.shtml.jp/htaccess/redirect.html> “Multiple names for computers for system migration”, [online], [Search May 14, 2007], Internet <http://www.atmarkit.co.jp/fwin2k/win2ktips/373mltname/ mltname.html>

However, for example, the method disclosed in Non-Patent Document 1 described above is based on the premise that the client terminal has a browser function or a URL redirection function.
Here, a client terminal, which is an appliance device that acquires setting information of its own device via a network, may receive setting information from an information providing server using a Web browser of a connected PC (Personal Computer), for example. is there. As described above, when setting is performed by HTTP (Hyper Text Transfer Protocol) communication using a Web browser, the setting information of the appliance apparatus is acquired by using the URL redirection function of a general Web browser. It is also possible to use an alternative server as the connection destination. The URL redirection is a function in which the browser automatically accesses the transfer destination URL by including the URL information of the transfer destination in the HTTP communication information transmitted from the server. However, when a Web browser is not used, the connection destination cannot be changed by URL redirection.
That is, the method disclosed in Non-Patent Document 1 cannot be applied to an appliance that does not use a Web browser and does not have a URL redirection function.

  In the method described in Non-Patent Document 2 described above, the transfer route of the IP packet on the network is changed by changing the DNS information. However, DNS information that is a combination of an FQDN and an IP address may be cached by the DNS cache server, the packet relay device, or the client terminal itself. In such a case, in the method described in Non-Patent Document 2 described above, it may take time to switch the connection destination, or it may be necessary to restart each device. Even if a TTL (Time to live) value, which is a setting value related to a period for holding the cache in the DNS cache server, is set to 0 (zero), the client terminal may still be caching. That is, when migrating an information providing server of a network system that requires high real-time properties, the method described in Non-Patent Document 2 described above cannot be applied.

In addition, for example, when the above-mentioned appliance device is regularly polled from the appliance, the server switching may have to be completed in a short time such as a second order. This is because if the server switching takes a long time and a server non-response period occurs, the subsequent operation of the appliance apparatus cannot be guaranteed.
Some appliances as described above have an FQDN for acquiring setting information over a network stored in advance at the time of shipment. In such a case, it is necessary to switch the connection destination to the information providing server without changing the FQDN.

In addition, when performing such system migration, it is desirable to prepare a test client terminal having the same configuration as that of an operating client terminal and to conduct a continuity test and an operation test to an alternative server over the network in advance. That is, it is desirable that access (polling) from a client terminal of a general user is performed by an operating server, while access from a test appliance is received by an alternative server.
It is desirable that such system migration is completed without making general users aware of the migration. This is because it is troublesome for general users to stop using the service or change the settings when the system is migrated.

  The present invention has been made in view of such a situation, and a connection destination migration method for efficiently completing system migration from an information providing server in operation to an alternative server without making the user aware of it. And a connection destination migration system.

In order to solve the above-described problem, the present invention provides a network capable of IP communication, a plurality of relay apparatuses having a routing table that stores path information for configuring a network and each controlling path in the network, The first server device and the second server device connected to the network, and the predetermined information from the first server device or the second server device connected to the network and transmitting to the information providing IP address A connection destination migration method for migrating a connection destination of an appliance device from a first server device to a second server device in a network system comprising: In addition, the information providing IP address is set as the transmission destination in association with the information providing IP address. When the data is received, the first route information having the second relay device having the route to the first server device as the transfer destination and the data having the information provision IP address as the transmission destination in association with the information provision IP address When received, the second route information having the third relay device having the route to the second server device as the transfer destination, and the priority indicating that the first route information has a higher priority than the second route information. Storing the information in advance, and the appliance device periodically transmitting the first information request data with the information providing IP address as the transmission destination, thereby allowing the first relay device and the second relay device to transmit the first information request data. in a state in which the first server apparatus is receiving the predetermined information, the test appliance device connected to the network, the transmission source IP address previously assigned to the own device, the information providing IP A step of transmitting the second information request data with the address as the transmission destination, and a transfer means connected to the network receiving the second information request data through the second relay device by referring to the transmission source IP address of the information request data The second information request data is transferred to the second server device, and the first information request data received through the second relay device is transferred to the first server device; When the information request data is received and history information indicating that the information is received is output, the first relay device or the second relay device is connected between the first relay device and the second relay device. When the information request data is received from the appliance when the first relay device detects the disconnection of the communication with the second relay device when the first relay device detects the disconnection of the communication with the second relay device. The information request data is transmitted to the third relay device according to the priority information, and the appliance device periodically transmits the first information request data with the information providing IP address as the transmission destination. Receiving the predetermined information from the second server device through the first relay device and the third relay device.

  In the present invention, the transfer means transfers the second information request data received through the second relay device to the second server device by referring to the transmission source IP address of the information request data, and the second relay device. In the step of transferring the first information request data received through the device to the first server device, the information request data is transmitted to the first server device by the second relay device and is provided in the first server device. The transfer means refers to the source IP address of the information request data, and sends the second information request data to the second information through a dedicated line connected in advance between the first server device and the second server device. It is performed by transferring to the server device.

  In the present invention, the transfer means transfers the second information request data received through the second relay device to the second server device by referring to the transmission source IP address of the information request data, and the second relay device. The step of transferring the first information request data received through the device to the first server device is performed by a transfer distribution device as transfer means connected to the first server device and the second server device. The second information request data is transferred from the second relay device, and the second information request data is transferred to the second server device by referring to the transmission source IP address of the information request data. It is performed by transferring the request data to the first server device.

The present invention relates to a network capable of IP communication, a plurality of relay devices having a routing table for storing route information for configuring a network and controlling a route in the network, and a first server connected to the network A device and a second server device, an appliance device connected to the network, receiving predetermined information from the first server device or the second server device by transmitting to the information providing IP address, and the network Connected to the test appliance device that transmits the second information request data with the IP address assigned to the device in advance as the transmission source and the information providing IP address as the transmission destination, and connected to the network to transmit the information request data Receiving through the second relay device by referring to the original IP address The second information request data is transferred to the second server device, a transfer means for transferring the first information request data received through the second switching device to the first server device, comprising a connecting appliance device A connection destination migration system for migrating a destination from a first server device to a second server device, wherein the first relay device stores data having an information provision IP address as a transmission destination in association with the information provision IP address. When receiving, when receiving the first route information having the second relay device having the route to the first server device as the transfer destination and the data having the information providing IP address as the transmission destination in association with the information providing IP address Second route information having a third relay device having a route to the second server device as a transfer destination, and priority information indicating that the first route information has a higher priority than the second route information; In advance A first routing table that stores information and a first routing control unit that controls a route with another relay device, and the second relay device communicates a route with the other relay device. A second routing control unit that performs control, wherein the appliance device transmits first information request data having the information providing IP address as a transmission destination through the first relay device, and first information Receiving means for receiving predetermined information as a response to transmission of request data through the first relay device, and the second server device receives the second information request data and shows a history indicating that it has been received. A communication unit that outputs information, and the appliance device periodically transmits the first information request data with the information providing IP address as the transmission destination, thereby allowing the appliance to pass through the first relay device and the second relay device. In a state in which the predetermined information is received from the first server device, the first or second routing control unit, when the history information is output from the communication unit , When the communication between the relay devices is disconnected, and the first routing control unit detects the disconnection of the communication with the second relay device and receives the information request data, the route of the routing table possessed by the own device The information is referred to, and the first information request data is transmitted to the third relay device according to the priority information.

  The present invention comprises a first line connecting a first server device and a second server device, the transfer means is provided in the first server device, and the transfer means receives from the second relay device. By referring to the source IP address of the information request data, the second information request data is transferred to the second server device through a dedicated line, and the first information request data is transferred to the own device. To do.

  The present invention includes a transfer distribution device as a transfer unit, and the transfer distribution device refers to the transmission source IP address of the information request data, thereby obtaining the second information request data received through the second relay device. The first information request data transferred to the second server device and received through the second relay device is transferred to the first server device.

  As described above, according to the present invention, when data corresponding to the information providing IP address is received in the routing table of the first relay device and the destination is the information providing IP address, the first When the first route information having the second relay device, which is the route to the server device, as the transfer destination and the data having the information provision IP address as the transmission destination are received in association with the information provision IP address, the first information is received. Second route information having a third relay device that is a route to the second server device as a transfer destination, and priority information indicating that the first route information has a higher priority than the second route information. Was previously stored. That is, an IP packet destined for the information providing IP address is forwarded to the first server, and is forwarded to the second server if the port of the second relay device is blocked. For this reason, the transfer destination of the IP packet destined for the information providing IP address transmitted from the appliance device via the network can be changed without changing the setting of the appliance device and without stopping the system. It is possible to move from the server to the second server.

  Further, according to the present invention, an IP packet transmitted from an appliance connected to a network and having a destination as an information providing IP address is transmitted from the test terminal while being transferred to the first server, and the destination is the same. The IP packet to be used as the information providing IP address was transferred to the second server, so it was confirmed that the IP packet transmitted from the test terminal was normally transferred to the second server via the network. Later, connection destinations can be migrated.

  Further, according to the present invention, an IP packet destined for the information providing IP address and transferred by the second relay device is controlled to be transferred via the dedicated line, and the transfer unit By using an L3 switch or the like, faster transfer can be performed.

  Furthermore, according to the present invention, the IP packet destined for the information providing IP address and transferred by the second relay device is transferred by the transfer distribution device. There is no need to connect the first server device that is the server and the second server device that is the migration destination with a dedicated line, and an IP packet transmitted from the test terminal can be transferred to the second server device. .

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>
FIG. 1 is a block diagram showing a configuration of a network system according to the first embodiment of the present invention.
As shown in FIG. 1, the network system according to the present embodiment includes a network 10 to which an appliance 100 and a test appliance 200 are connected, a first server 600 and a second server connected to the network 10. And a server 700. Here, the network 10 is a network network that transmits and receives IP packets by IP communication, and is, for example, a computer network in which IP packets are relayed by a router. That is, the network 10 is provided with a plurality of routers. In the present embodiment, the first router 300, the second router 400, and the third router 500 will be specifically described as examples.

  Here, the IP packet has a header part in which information on the IP address of the destination host and the IP address of the transmission source host is stored, and a data part in which data to be transmitted is stored. Also, “relay IP packet” means determining an optimal transfer destination IP address for an IP packet having a specific IP address in the header part as a destination IP address based on information stored in the routing table, The IP packet is transferred to the transfer destination IP address. Here, the “optimum transfer destination IP address” is determined based on the value of the priority information.

  The appliance device 100 is a so-called network appliance device. A so-called network appliance device is a PC server or the like used as a network device for general purpose. For example, Web, mail, DNS, DHCP (Dynamic Host Configuration Protocol), HTTP cache, router, file server, SSL (Secure Socket Layer) This is a dedicated device customized for specific purposes and communications, such as an encryption device. The appliance device 100 is, for example, a housing incorporating hardware including software for a specific application, and automatically connects to a web server or the like operated by a provider of the housing via a network. Setting information unique to the network can be set via the network.

  Here, in the present embodiment, the appliance device 100 has a function of periodically accessing (polling) the first server 600 and receiving and setting the setting information unique to the device itself from the first server 600. Have. At this time, the appliance 100 stores in advance a FQDN indicating the first server 600 in its own apparatus, and an IP address corresponding to the FQDN (hereinafter, an information providing IP address) is set in the DNS existing in the network 10. Obtain from the server. The appliance 100 stores the acquired information providing IP address, accesses the information providing IP address periodically (for example, once a day at a predetermined time), and Configuration information is received from the server corresponding to the provided IP address.

Further, the appliance device 100 is not necessarily a network appliance device as described above as long as it is a device that periodically accesses (for example, polls) a web server via the network 10. A plurality of appliance devices 100 may be connected. In the present embodiment, the appliance device 100 will be described assuming a so-called line termination device for connecting a network line and a data terminal device (DTE (Data Terminal Equipment)) such as a PC.
The test appliance 200 is a device for determining whether the appliance 100 can normally communicate with the server corresponding to the information providing IP address via the network 10, and has the same configuration as the appliance 100. I am doing.

  The first router 300 is a general router having a first routing control unit 301 and a first routing table 302. That is, when the first router 300 receives the IP packet, the first routing control unit 301 reads the destination IP address written in the header portion of the IP packet, and optimally corresponds to the read IP address. The transfer destination IP address is detected from the first routing table 302. The first routing control unit 301 transfers the IP packet to the detected transfer destination IP address.

  Here, for example, as shown in FIG. 2, the first routing table 302 stores a transfer destination IP address and priority information in association with the destination IP address. The destination IP address is an address stored as a destination IP address in the header portion of the IP address. The transfer destination IP address is an IP address indicating a router capable of transferring an IP packet to the IP address. The priority information is information serving as a determination criterion for determining which route to select when the first routing table 302 stores a plurality of routes to the same destination IP address.

  Here, the priority information is indicated by, for example, a metric attribute of each route in a routing table stored in a general router. The metric attribute is information for determining the optimum route to the destination, and may be information that compares the superiority and inferiority of the routes. For example, the metric attribute is information in which the distance to the destination IP address, the number of hops, the bandwidth, the delay, the reliability, the load, the line speed, the MTU (Maximum Transmission Unit, Maximum Transfer Unit), and the like are digitized.

  In the network system according to the present embodiment, the information providing IP address is stored in the first server 600 and the second server 700 as the IP address of the own device. Here, the network segment in which the second router 400 is connected to the first server 600 and the network segment in which the third router 500 is connected to the second server 700 have the same subnet configuration. Then, the dedicated line 20 through which the first server 600 and the second server 700 can communicate is connected. In this way, a network in which the first server 600 and the second server 700 have the same information providing IP address is configured.

  For example, an IP address is set in the network system in this embodiment as shown in FIG. That is, when the information providing IP address is “1.1.1.1”, the IP address of the second router 400 is “10.10.10.10”, and the IP address of the third router 500 is Is “20.20.20.20”, the address in the local segment to which the second router 400 is connected is “2.2.2.10”, and the third router 500 is connected. Set so that the IP address in the local segment is “1.1.1.10” and the IP addresses of the first server 600 and the second server 700 are “1.1.1.1”. Is done.

  Here, the first routing table 302 is, for example, the first transfer destination that is transfer destination information indicating the second router as the transfer destination in association with the information providing IP address (1.1.1.1). Stores route information of IP address (10.10.10.10) and first priority information (distance 1) which is information indicating superiority or inferiority of the route to the second router, and further provides information A second transfer destination IP address (20.20.20.20), which is transfer destination information indicating the third router as a transfer destination, in association with the IP address (1.1.1.1), and a third The second priority information, which is information indicating the superiority or inferiority of the route to the router and indicating lower priority than the first priority information, and the route information of (distance 10) are stored.

  When the first routing table 302 stores such route information, for example, an IP packet having the destination IP address “1.1.1.1” that is the information providing IP address is sent from the appliance 100 to the network 10. The first router 300 receives the IP packet. The first routing control unit 301 of the first router 300 refers to the route information stored in the first routing table 302 and performs a transfer destination determination process for determining the transfer destination of the IP packet. As shown in FIG. 2, when the same destination IP address (1.1.1.1) exists in the first routing table 302, the priority information is referred to and the priority is higher (distance is higher). The (short) transfer destination IP address is detected as the transfer destination IP address. That is, in the example shown in FIG. 2, “10.10.10.10” is detected as the transfer destination IP address.

  In the present embodiment, the value stored in the first routing table 302 is determined by the first routing control unit 301 such as RIP (Routing Information Protocol), OSPF (Open Shortest Path First), BGP (Border Gateway Protocol), or the like. It is assumed that the data is dynamically updated and stored by dynamic routing according to the routing protocol.

The second router 400 has the same configuration as that of the first router 300 and is a router in the same segment as the first server 600. Here, a segment is a group of nodes that are installed in the same IP address class and indicated by one network address. That is, the second router 400 is a router that can cause the first server 600 to reach the IP packet.
The third router 500 has the same configuration as the first router 300 and is a router in the same segment as the second server 700. That is, the third router 500 is a router capable of causing the second server 700 to reach the IP packet.

  The first server 600 is a server that transmits and provides setting information to the appliance apparatus 100 via the network 10, and includes a communication unit 601 and a transfer unit 602. The communication unit 601 transmits and receives IP packets to and from a terminal connected to the network 10 via the second router 400. The transfer unit 602 stores in advance a test IP address, which is an IP address corresponding to the test appliance 200, reads an IP packet transmitted to the first server 600, and the source IP address is the test IP address. If it matches the address, the IP packet is transferred to the second server 700 via the dedicated line 20. Here, the dedicated line 20 may be a connection line of a closed network configured so as not to communicate with the network 10.

  Here, the transfer unit 602 is, for example, an L3 (layer) switch. The L3 switch is a device that performs routing by hardware, for example. Since the L3 switch performs routing processing at the hardware level, the routing speed is about the same as the speed of the connected line, and an extremely high throughput is obtained compared to a general router that performs routing by software. Network equipment that can. Further, if the L3 switch is used, routing can be performed without using the resources of the first server device.

  The second server 700 is a server for transmitting and providing setting information to the appliance apparatus 100 via the network 10. For example, when the system is upgraded, an error occurs, or the first server 600 is maintained. The server provides information to the appliance 100 in place of the first server 600 when performing work or the like. The second server 700 has a communication unit 701 and a transfer unit 702. The communication unit 701 transmits / receives IP packets to / from terminals connected to the network 10 via the third router 500. The transfer unit 702 receives the IP packet transferred from the transfer unit 602. The transfer unit 702 is, for example, an L3 switch.

  Thus, as shown in FIG. 1, segment A is allocated between the second router 400 and the first server 600, and between the third router 500 and the second server 700. A segment B different from the segment A is allocated, and a segment C different from the segment A and the segment B is allocated between the first server 600 and the second server 700.

Next, with reference to FIG. 3, an operation example of connection destination migration in the network system according to the first embodiment of the present invention will be described.
First, the system transition person prepares a second server 700 as an alternative server for the first server 600 and connects it to the network 10. In addition, the information providing IP address described above is stored in advance in the second server 700 as the IP address of its own device.

  The plurality of appliances 100 periodically transmit, for example, IP packets for polling to the information providing IP address at predetermined intervals (step S101). The first router 300 receives an IP packet. The first routing control unit 301 included in the first router 300 detects the transfer destination IP address corresponding to the information providing IP address from the routing information stored in the first routing table 302. Here, as described above, the first routing table 302 included in the first router 300 includes the second router 400 and the third router 500 as transfer destinations that can be transferred to the information providing IP address. An IP address is stored. In the first routing table 302, the route to the second router 400 has a higher priority than the route to the third router 500, so the first router 300 is the second router. The IP address of 400 is determined as the transfer destination, and the IP packet is transferred to the second router 400 (step S102).

  The second router 400 receives the IP packet. The second routing control unit 401 transfers the IP packet to the information providing IP address in its own segment (step S103). When receiving the IP packet, the transfer unit 602 of the first server 600 transmits a response IP packet to the second router 400 as a response to polling (step S104).

Upon receiving the response IP packet, the second router 400 transfers the response IP packet to the first router 300 (step S105). Upon receiving the response IP packet, the first router 300 transfers the response IP packet to the appliance device 100 (step S106).
A plurality of appliances 100 connected to the network 10 periodically perform the polling described in steps S101 to S106. In the present embodiment, for example, about one million appliances 100 perform such polling once a day.

  Then, the test appliance 200 starts polling communication test processing with the second server 700 (step S201). That is, an IP packet is transmitted to the information providing IP address via the network 10 (step S202). When receiving the IP packet, the first router 300 transfers the IP packet to the second router 400 based on the information stored in the first routing table 302 (step S203). When receiving the IP packet, the second router 400 transfers the IP packet to the first server 600 based on the information stored in the second routing table 402 (step S204).

  When the first server 600 receives the IP packet, the transfer unit 602 reads the header part of the IP packet and determines that the transmission source IP address corresponds to the test appliance 200. Then, the transfer unit 602 transfers the IP packet to the second server 700 via the dedicated line 20 (step S205).

  When the transfer unit 702 of the second server 700 receives the transferred IP packet, the communication unit 701 transmits a response IP packet to the first server 600 as a response to polling (step S206). At this time, when the second server 700 receives the IP packet and transmits the response IP packet, the second server 700 generates and stores an access log file indicating that the polling has been normally responded. When the second server 700 detects an abnormality such as that the received IP packet is not in a predetermined format, the second server 700 generates and stores an access log file indicating that an error has occurred.

  Upon receiving the response IP packet, the first server 600 transfers the response IP packet to the second router 400 (step S207). When receiving the response IP packet, the second router 400 transfers the response IP packet to the first router 300 (step S208). Upon receiving the response IP packet, the first router 300 transfers the response IP packet to the test appliance 200 (step S209). Upon receiving the response IP packet, the test appliance 200 determines that information communication from the test appliance 200 to the second server 700 via the network 10 has been performed normally, and completes the polling test process ( Step S210).

  When the second router 400 detects that the access log indicating that the polling test processing from the test appliance 200 to the second server 700 has been completed, the second router 400 Determines that the information communication has been normally performed, and shuts down (blocks) the port on the first router 300 side (the port opened to the network 10) (step S301). Note that the processing in step S301 may be performed by the first router 300 blocking the port opened to the second router 400.

  Here, each router in the network 10 performs dynamic routing. That is, the first router 300 inquires routing information to the second router 400 using a dynamic routing protocol (step S302). If the second router 400 notifies the first router 300 that the port has been shut down (step S303) or does not respond, the first routing control unit 301 of the first router 300 Then, the route to the second router 400 stored in the first routing table 302 is updated to be invalidated (step S304).

  Then, the appliance 100 transmits an IP packet to the first router 300 with the information providing IP address as the destination. Then, the first routing control unit 301 included in the first router 300 detects the transfer destination IP address corresponding to the information providing IP address from the routing information stored in the first routing table 302. Here, as described above, since the route to the second router 400 is invalidated, the first routing control unit 301 determines the IP address of the third router 500 as the transfer destination, and the IP packet. Are transferred to the third router 500. (Step S402). Then, when the third router 500 receives the IP packet, the third routing control unit 501 transfers the IP packet to the second server 700 based on the information stored in the third routing table 502 ( Step S403).

When receiving the IP packet, the communication unit 701 of the second server 700 transmits a response IP packet to the third router 500 as a response to polling (step S404).
Upon receiving the response IP packet, the third router 500 transfers the response IP packet to the first router 300 (step S405). Upon receiving the response IP packet, the first router 300 transfers the response IP packet to the appliance apparatus 100 (step S406). The appliance device 100 receives the response IP packet.

  As described above, according to the present embodiment, the first server 600 is operating in the connection destination changing method when the service provided to the appliance apparatus 100 via the network 10 is transferred to the second server 700. The system migration from the first server 600, which is the information providing server, to the second server 700, which is the alternative server, can be completed efficiently without the user being aware of it.

  In the present embodiment, each router on the network updates the information stored in the routing table by dynamic routing. However, the routing table may be set by static routing. In other words, the priority information stored in the routing table of all routers connected to the network 10 and relaying IP packets to the second server 700 is set in advance to the first server more than the priority information of the second server 700. The priority information 600 may be stored so as to have a higher priority, and the port of the second router 400 may be blocked.

<Second Embodiment>
Next, an embodiment will be described in which the transfer distribution device 620 installed outside the first server 600 relays an IP packet transmitted from the above-described test appliance device 200 to the information providing IP address. The network system according to the second embodiment has the same configuration as that of the first embodiment, and the description of the same configuration and processing is omitted. Hereinafter, the configuration and processing unique to the second embodiment will be described. According to the present embodiment, as shown in FIG. 6, IP packets transmitted from the appliance device 100 are sent to the first server 600, and IP packets sent from the test appliance device 200 are sent to the second server 700. Transferred.

FIG. 4 is a block diagram showing the configuration of the network system in the second embodiment of the present invention.
As shown in FIG. 4, a segment A is allocated between the second router 400 and the transfer distribution device 620, and a segment A is allocated between the third router 500 and the second server 700. A different segment B is allocated, and a segment D that is different from both the segment A and the segment B is allocated between the transfer distribution device 620, the first server 600, and the second server 700.

  Here, for example, as shown in FIG. 7, the transfer distribution device 620 and the first server 600 are connected via the fourth router 650, and the transfer distribution device 620 and the second server 600 are connected to each other. The server 700 may be connected via the fifth router 660. For example, the transfer distribution device 620 corresponds to the transmission source IP address of the IP packet, and previously indicates information indicating whether the IP packet is transferred to the fourth router 650 or the fifth router 660. The packet is stored in the storage unit 622, and the IP packet is transferred based on the IP address of the fourth router 650 or the fifth router 660.

  The transfer distribution device 620 distributes the transfer destination of the IP packet according to information such as the destination and the transmission source of the IP packet. The transfer distribution device 620 is, for example, a load distribution device, and may be a network device such as a load balancer, L / 4 switch, L / 7 switch, etc., and expandability when a web service capability becomes insufficient or a failure occurs. It has a function to improve time availability. If such a transfer distribution device 620 is used, various added values can be given to the network system depending on the setting. The transfer distribution device 620 includes a transfer unit 621 and a transfer information storage unit 622.

  For example, the transfer unit 621 transfers the IP packet based on the information stored in the transfer information storage unit 622. The transfer information storage unit 622 stores information for transferring the IP packet to the information providing IP address. For example, in the transfer information storage unit 622, the information providing IP address, the information that associates the IP address of the fourth router 650 and the IP address of the first server 600, the IP address of the fifth router 660, and Information that associates the IP address of the second server 700 with the IP address of the test appliance 200 is stored.

Next, an operation example in which the network system according to the second embodiment transfers an IP packet transmitted from the test appliance 200 to the second server 700 will be described with reference to the sequence diagram of FIG.
In step S204, when the IP packet destined for the information providing IP address is transferred to the first server 600, the transfer distribution device 620 receives the IP packet.

  When the transfer distribution device 620 receives the IP packet, the transfer unit 621 reads the source IP address from the header portion of the IP packet. The transfer unit 621 refers to the information detected from the transfer information storage unit 622, the destination IP address of the IP packet is the information providing IP address, and the source IP address of the IP packet is sent to the test appliance 200. If it is determined that the IP address is the same as the corresponding IP address, the IP address of the fifth router, which is the router connected to the second server 700, is read from the transfer information storage unit 622.

  Then, the transfer unit 621 transfers the IP packet to the second server 700 via the fifth router (step S205-2). When the second server 700 receives the transferred IP packet, the communication unit 701 transmits a response IP packet as a response to polling to the first server 600 (step S206-2). After the connection destination transfer is completed, the first server and the transfer distribution device 620 may be removed. For this purpose, a transfer distribution device may be further provided between the second server 700 and the third router 500 in advance.

In addition to the above-described configuration, the transfer distribution device 620 is further provided with a MAC address storage unit that stores MAC (Media Access Control address) addresses of the first server 600 and the second server 700, and the transfer unit 621 May identify the destination by the MAC address and perform the transfer.
In addition to the above-described configuration, the information distribution IP address may be allocated to the transfer distribution device 620 as a virtual IP address. In this case, the private addresses in the segment D are allocated to the IP addresses of the first server 600 and the second server 700 in the segment D shown in FIG. 4, and the transfer distribution device 620 uses the IP address to generate an IP packet. Determine the transfer destination.

  In this way, if the second router 400 and the transfer distribution device 620 are connected and the IP packet transmitted to the information providing IP address is transferred, the packet is transmitted from the test appliance 200 without using the dedicated line. The IP packet can be transferred to the second server 700.

  As described above, according to the present invention, the communication from the appliance apparatus 100 to the first server 600 and the communication from the test appliance apparatus 200 to the second server 700 are distributed, so that the first operation can be performed during service operation. The normality of the operation of the second server 700 can be confirmed, and after the test, the setting of the first router 300 is changed, and the communication from the appliance apparatus 100 to the first server 600 is switched to the second server 700. Thus, the connection destination can be migrated without stopping the system.

  Note that the program for realizing the function of the processing unit in the present invention is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into the computer system and executed, so that the connection destination is transferred. You may go. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer system” includes a WWW system having a homepage providing environment (or display environment). The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Further, the “computer-readable recording medium” refers to a volatile memory (RAM) in a computer system that becomes a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In addition, those holding programs for a certain period of time are also included.

  The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

1 is a block diagram showing a network system according to a first embodiment of the present invention. 1 is a conceptual diagram showing a network system according to a first embodiment of the present invention. It is a sequence diagram which shows the operation example of the network system by the 1st Embodiment of this invention. It is a block diagram which shows the network system by the 2nd Embodiment of this invention. It is a sequence diagram which shows the operation example of the network system by the 2nd Embodiment of this invention. It is a conceptual diagram which shows the example of transfer of communication by the 2nd Embodiment of this invention. It is a conceptual diagram which shows the example of transfer of communication by the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Network 20 Private line 100 Appliance apparatus 200 Test appliance apparatus 300 1st router 301 1st routing control part 302 1st routing table 400 2nd router 401 2nd routing control part 402 2nd routing table 500 Third router 501 Third routing control unit 502 Third routing table 600 First server 601 Communication unit 602 Transfer unit 620 Transfer distribution device 621 Transfer unit 622 Transfer information storage unit 650 Fourth router 660 Fifth router Router 700 Second server 701 Communication unit 702 Transfer unit

Claims (6)

A network capable of IP communication, a plurality of relay devices that constitute the network, each having a routing table that stores route information for controlling a route in the network, and a first server device connected to the network And an appliance device that is connected to the network and receives predetermined information from the first server device or the second server device by transmitting to the information providing IP address. In the network system, the connection destination migration method for migrating the connection destination of the appliance device from the first server device to the second server device,
A second relay apparatus having a route to the first server apparatus when receiving data having the information provision IP address as a transmission destination in association with the information provision IP address in the routing table of the first relay apparatus The third relay device having a route to the second server device when receiving the first route information as a transfer destination and data having the information provision IP address as a transmission destination in association with the information provision IP address Preliminarily storing second route information having a transfer destination and priority information indicating that the first route information has higher priority than the second route information;
The appliance device periodically transmits the first information request data with the information providing IP address as a transmission destination, thereby allowing the first server device to pass through the first relay device and the second relay device. In a state where the predetermined information is received from the network, the test appliance device connected to the network uses an IP address given to the device in advance as a transmission source and uses the information providing IP address as a transmission destination. Transmitting the information request data of 2;
Transfer means connected to the network transfers the second information request data received through the second relay device to the second server device by referring to the source IP address of the information request data And transferring the first information request data received through the second relay device to the first server device;
When the second server device receives the second information request data and outputs history information indicating that it has been received, the first relay device or the second relay device receives the first information request data. Disconnecting communication between one relay device and a second relay device;
When the first relay device detects disconnection of communication with the second relay device and receives the information request data from the appliance device, it refers to the routing information of the routing table of the own device. Transmitting the information request data to the third relay device according to the priority information;
The appliance apparatus periodically transmits the first information request data with the information providing IP address as a transmission destination, whereby the second server apparatus is transmitted through the first relay apparatus and the third relay apparatus. Receiving the predetermined information from:
Including a connection destination migration method. The transfer means transfers the second information request data received through the second relay device to the second server device by referring to a source IP address of the information request data, and the second server device Transferring the first information request data received through the relay device to the first server device,
The information request data is transmitted to the first server device by the second relay device, and the transfer means provided in the first server device refers to the source IP address of the information request data Thus, the second information request data is transferred to the second server device through a dedicated line connected in advance between the first server device and the second server device. The connection destination migration method according to claim 1 , wherein: The transfer means transfers the second information request data received through the second relay device to the second server device by referring to a source IP address of the information request data, and the second server device Transferring the first information request data received through the relay device to the first server device,
A transfer distribution device as the transfer means connected to the first server device and the second server device,
By receiving the information request data transferred from the second relay device and referring to the source IP address of the information request data, the second information request data is transferred to the second server device. , destination migration method according to claim 1, characterized in that it is carried out by transferring the first information request data to the first server device. A network capable of IP communication, a plurality of relay devices that constitute the network, each having a routing table that stores route information for controlling a route in the network, and a first server device connected to the network And the second server device, the appliance device connected to the network and receiving predetermined information from the first server device or the second server device by transmitting to the information providing IP address, and the network Connected to the network, a test appliance device that transmits second information request data with the IP address pre-assigned to the device as a transmission source and the information provision IP address as a transmission destination, and an information request connected to the network By referring to the data source IP address, the second relay Transfer means for transferring the second information request data received through the device to the second server device, and transferring the first information request data received through the second relay device to the first server device; the provided, a connection destination migration system for migrating a connection destination of the appliance device from a first server device to the second server device,
The first relay device
When receiving data having the information provision IP address as a transmission destination in association with the information provision IP address, first route information having a second relay device having a route to the first server device as a transfer destination; When receiving data having the information provision IP address as a transmission destination in association with the information provision IP address, second route information having a third relay device having a route to the second server device as a transfer destination A first routing table that stores in advance priority information indicating that the first route information has a higher priority than the second route information;
A first routing control unit that controls a route with another relay device,
The second relay device is
A second routing control unit that controls a route with another relay device,
The appliance device is:
Transmitting means for transmitting first information request data having the information providing IP address as a transmission destination through the first relay device;
Receiving means for receiving the predetermined information through the first relay device as a response to the transmission of the first information request data;
The second server device is
A communication unit that receives the second information request data and outputs history information indicating reception;
The appliance device periodically transmits the first information request data with the information providing IP address as a transmission destination, thereby allowing the first server device to pass through the first relay device and the second relay device. In a state where the predetermined information is received from
The first or second routing control unit disconnects communication between the first relay device and the second relay device when the history information is output from the communication unit ,
When the first routing control unit detects disconnection of communication with the second relay device and receives the information request data, the first routing control unit refers to route information in a routing table of the own device, and According to the degree information, the first information request data is transmitted to the third relay device. A dedicated line connecting the first server device and the second server device;
The transfer means is provided in the first server device,
The transfer means includes
The second information request data is transferred to the second server device through the dedicated line by referring to the source IP address of the information request data received from the second relay device, and 5. The connection destination migration system according to claim 4 , wherein the information request data is transferred to the local apparatus. A transfer distribution device as the transfer means;
The transfer distribution device includes:
By referring to the source IP address of the information request data, the second information request data received through the second relay device is transferred to the second server device and received through the second relay device. The connection destination migration system according to claim 4 , wherein the first information request data to be transferred is transferred to the first server device.

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