JP3159180B2 - Dialup router device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dialup router apparatus for connecting a LAN terminal accommodated in a LAN to a LAN terminal accommodated in another LAN through a wide area network by dialup routing, and more particularly to a transmission apparatus. Destination LAN terminal name (appropriately described as destination name) and connection transfer destination telephone number (suitably abbreviated as connection transfer destination)
The present invention relates to a dial-up router device for executing a name address resolution from a server to obtain a destination LAN terminal address.

[0002]

2. Description of the Related Art Conventionally, when a router is connected to another LAN via a wide area network (WAN), for example, the Internet, the router manages the entire network and manages the traffic state. Further, the LAN terminal accommodated in the LAN accesses the LAN terminal accommodated in the LAN on the other side through the dialup router device. Such L
In the AN, an address is assigned to each LAN terminal.

[0003] A LAN terminal has a LAN terminal address of a transmission destination (referred to as a transmission destination address as appropriate) and a LA of a transmission source.
The N terminal address (appropriately described as a source address) is stored in a packet and transmitted. The respective LAN terminals of the destination address and the source address are connected by dialup routing based on the destination address, and communication by packet exchange is performed. Such a LAN
The terminal address is an array of numbers only, and is not easily handled by a person. Therefore, each LAN terminal is given a LAN terminal name (for example, a host name on the Internet) and handled.

Therefore, when connecting to a LAN terminal specified by a LAN terminal name, the connection cannot be established unless the destination address of the LAN terminal name is known.
When acquiring the transmission destination address from the LAN terminal name, so-called name address resolution is executed. As the execution of this name address resolution, the following first and second methods are known.

In the first method, a correspondence table (address routing table) in which a destination name and a destination address correspond to each other is stored in a LAN terminal, and name address resolution is executed. In this case, when the number of LAN terminals having the destination name is small and the destination addresses are known, it is easy to register the destination name and the destination address in the routing table, and there is no problem. However, if the number of LAN terminals with destination names is unspecified and the destination addresses are unknown, the destination name and destination address cannot be registered in the routing table. Resolution cannot be performed.

In the second method, when a packet for performing name address resolution is received from another LAN terminal, a destination address corresponding to the inquiry LAN terminal name is registered in the own LAN terminal. If the answer is YES, and if not registered, the address of the LAN terminal of another inquiry destination is notified to execute name address resolution. In this case, the destination name LAN
By making an inquiry to another LAN terminal arranged near the terminal and following the connection destination name in order, it is possible to obtain the transmission destination address of the required transmission destination LAN terminal name.

A dialup router in such a LAN stores a routing table in which only one connection transfer destination such as an Internet connection company is registered for each destination address, and also stores a routing table for each group name of a plurality of destination addresses. A routing table in which only one connection transfer destination such as a connection provider is registered is stored. And LA
When a packet is received from the N side, a routing table is searched based on the destination address stored in the packet, and the connection transfer destination is determined.

The reason why only one connection transfer destination such as a connection provider is registered for each group name is that a plurality of L
One LAN accommodating the AN terminals is constructed in one enterprise organization (for example, a branch office), and therefore, is connected to a group name of a plurality of LAN terminals accommodated in the LAN by dialup routing. In this way, since data transfer is mainly performed only within the organization, it is necessary to change the registered contents of the routing table in all dialup routers when changing the destination address even if the connection destination name is the same. is there.

[0009] As an example of improving such disadvantages,
Japanese Patent Application Laid-Open No. 9-270854, "Method of Managing Destination Phone Number and Its Management System"
There is an example of 259 "Network system" gazette,
None of the prior arts can cope with the setting of the connection transfer destination by the transmission destination name.

[0010]

As described above, in the above-described conventional dialup router, it is not possible to set a connection transfer destination by a destination name. Therefore, even when the destination name is changed, the destination address is changed. It is necessary to change the registered contents of the routing table in all dialup routers, and the operability is poor.

[0011] The present invention is to solve such a problem in the prior art, and it is possible to set a connection transfer destination by a destination name, and the destination name is not changed.
Even when only the transmission destination address is changed, it is not necessary to change the registered contents of the routing tables in all the dialup routers, and an object of the present invention is to provide a dialup router device with improved operability.

Further, in the present invention, a connection destination of a routing table is used as an inquiry destination, and it is necessary to provide a terminal for executing name address resolution in one LAN which accommodates the dialup router device. Another object of the present invention is to provide a dial wrap router device that can eliminate the system configuration and reduce the system configuration.

[0013]

In order to achieve the above-mentioned object, the present invention relates to a LAN terminal accommodated in one LAN from a LAN terminal accommodated in another LAN through a network.
In a dialup router device connected to an AN terminal by dialup routing, a connection is established with a connection transfer destination corresponding to a name of a LAN terminal transmitted from one LAN terminal, and a name address resolution notified from the connection transfer destination is transmitted. Receiving the address of the terminal for executing the process, notifying the terminal address of the destination LAN terminal name, acquiring and registering the resolved address, and connecting to the registered destination address by dialup routing. It is configured to include an address solution executing unit.

Further, the name / address resolution executing means includes:
The configuration is such that the destination address of the other side is acquired based on the LAN terminal name and connection transfer destination of the other side registered in advance.

[0015] Further, as the name address resolution executing means, a LAN for performing an interface process with a LAN terminal is provided.
An interface unit, a determining unit for determining whether to execute a name address resolution from the LAN terminal through the LAN interface unit, or transmitting a received packet to the LAN terminal via the LAN interface unit; a destination name and a destination address; A name routing table in which connection destinations are registered in correspondence with each other; a routing engine unit for searching and transmitting a connection transfer destination of a destination address stored in a packet from a LAN terminal from a name routing table; An address routing table in which a destination address and a connection transfer destination that are searched for by the unit are registered correspondingly; a name address resolution unit that performs name address resolution to obtain a destination address to be registered in the name routing table; From LAN terminal Run the call control for the signal address, and is connected as a result configuration comprising a network control unit which performs control to notify the LAN terminal, and a network interface unit for processing an interface with the network.

Also, the present invention provides a method in which a LAN terminal accommodated in one LAN receives an LA from another LAN through a network.
Group name of a plurality of LAN terminals having the same connection transfer destination corresponding to the name of the destination LAN terminal transmitted by one of the LAN terminals in the dialup router device connected to the LAN terminal accommodated in N by dialup routing Of the other side for connecting with the connection transfer destination of the other side and executing the name address resolution notified from the connection transfer destination.
N receives the address of the terminal at N, notifies the received terminal address of the name of the LAN terminal of the transmission destination, acquires and registers the resolved address, and registers the registered destination address by dialup routing. The configuration includes a solution executing unit.

Further, the name address resolution executing means includes:
The transmission destination address and the connection transfer destination are acquired and registered based on the group names and the connection transfer destinations of the plurality of LAN terminals on the other side registered in advance.

The name address resolution executing means may be a LAN for performing interface processing with a LAN terminal.
Interface section and multiple LAs with the same connection transfer destination
A name routing table in which a destination name and a connection transfer destination, which are group names of N terminals, are registered correspondingly;
A query for execution of name address resolution from the LAN terminal is determined through the AN interface unit, or the received packet is
A determination unit for sending to the AN terminal, a routing engine unit for searching the name routing table for a connection transfer destination of the destination address stored in the packet from the LAN terminal and sending it, and a destination address for search by the routing engine unit. An address routing table in which connection destinations are registered correspondingly, a name address resolution unit that performs name address resolution to obtain a destination address registered in the name routing table, and a destination from the name address resolution unit A resolved address routing table in which an address and a connection transfer destination are registered, a network control unit that performs call control for a destination address from the LAN terminal, and controls to notify the LAN terminal of the connection result; Network In Processing Interface It is constituted and a chromatography face portion.

The dialup router device according to the present invention having the above-described configuration is capable of transmitting the LA of the transmission destination transmitted by one LAN terminal.
A resolved address (destination address) is obtained from the name of the N terminal through the terminal on the LAN on the other side for performing the connection transfer destination and name address resolution, and the destination name and the connection transfer destination are named along with the destination address. After registering in the routing table, dialup routing is performed based on the destination name.

As a result, even if the destination name is not changed and only the destination address is changed, it is not necessary to change the registered contents of the routing tables in all dialup routers. Operability in connection is improved. Further, a connection transfer destination of the routing table is used as an inquiry destination, and a terminal for performing name address resolution is connected to the LA on one side.
N need not be provided, and the device scale can be reduced.

Further, the dialup router device according to the present invention uses the group name of a plurality of LAN terminals having the same connection transfer destination corresponding to the name of the LAN terminal of the transmission destination transmitted by the one LAN terminal to determine the connection transfer destination and the name. A resolved address (destination address) is acquired through a terminal on the other LAN for performing address resolution. The connection transfer destination is registered in the name routing table together with the obtained destination address, and thereafter, dialup routing is performed based on the destination name.

As a result, the operability is improved and the device scale can be reduced as described above, and dialup routing can be performed from the group name of a plurality of LAN terminals having the same connection transfer destination.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the dialup router device of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of a dialup router device according to a first embodiment of the present invention. This example has a dialup router device 1 and LAN terminals 10 and 11 as one side connected to a LAN transmission line.

The dialup router device 1 includes a LAN interface unit 2 for processing an interface (I / F) with the LAN terminals 10 and 11, and a packet received through the LAN interface unit 2 for executing name / address resolution. And a decision unit 3 for sending a packet received from the routing engine unit 4 or the name address resolution unit 6 to the LAN interface unit 2.

Further, the dialup router device 1 has a LA
A routing engine unit 4 for retrieving a connection transfer destination of a destination address stored in communication packets from the N terminals 10 and 11 from the name routing table 7 and sending it to the WAN control unit 8 and the WAN interface unit 9;
The routing engine unit 4 has an address routing table 5 in which destination addresses and connection destinations to be searched for are registered in correspondence with each other.

The dialup router device 1 further includes a name address resolution unit 6 for acquiring a destination address registered in the name routing table 7 by executing name address resolution, and a search performed by the name address resolution unit 6. A name routing table 7 in which destination names, destination addresses (LAN terminal addresses) and connection transfer destinations are registered in correspondence with each other, and call control for connecting to destination addresses from the LAN terminals 10 and 11 are executed. It has a WAN control unit 8 for performing control to notify the connection results by the call control to the LAN terminals 10 and 11, and a WAN interface unit 9 for processing an interface with the WAN.

The judging unit 3 judges whether the packet received through the LAN interface unit 2 is an inquiry for executing name address resolution, and in the case of an inquiry packet, sends this inquiry packet to the name address solving unit 6. In the case of a packet other than execution of name address resolution transmission, the received packet is transmitted to the routing engine unit 4. Further, the determination unit 3 sends the packets from the routing engine unit 4 and the name address resolution unit 6 to the LAN interface unit 2.

The WAN control unit 8 connects the WAN interface unit 9 to the destination address specified by the routing engine unit 4 or the name address resolution unit 6.
Call control through the LAN terminal 1
Notify 0,11. In the name routing table 7, a destination name, a destination address, and a connection transfer destination are registered in association with each other.
Although set from an external device in advance, the destination address is not set from the external device, but is acquired and registered by the name address resolution unit 6 by executing name address resolution.

The LAN interface 2 and W
The AN interface unit 9 is constituted by a digital signal processor (DSP), but is generally used. This LAN
The components other than the interface unit 2 and the WAN interface unit 9 are generally constituted by a processor and a memory.

FIG. 2 is a diagram for explaining the contents of the address routing table 5. The address routing table 5 is the same as that used in the related art. A destination address (a destination LAN terminal address) and a connection transfer destination are registered in correspondence with each other. The transfer destination is registered in advance through an external device. Here, the destination address “100.10
0.1100.101 / 100.100.101.123
/100.100.102.456... ”And the corresponding connection transfer destination“ 03-1000-0001 / 06-
1000-0002 / 052-100-0003 ... "is registered.

FIG. 3 is a diagram for explaining the initial setting state of the name routing table 7, and FIG. 4 is a diagram for explaining the registration state of the transmission destination address in the name routing table 7.

In the initial setting state of the name routing table 7 shown in FIG. 3, the destination name is "tky1.tky.a".
ny. com / osa1. osa. any. com / n
gy1. ngy. any. com ... "is registered, and the connection transfer destination" 03-1000-0 "corresponding to this transmission destination name is registered.
001 / 06-1000-0002 / 052-100-
0003 ... "is further registered. The destination address column is unregistered. The destination address is acquired and registered by the name address resolution unit 6 based on the execution of the name address resolution described below. In FIG. 4, the destination address “100.100.100.111” is acquired and registered.

Next, the operation of the first embodiment will be described. As a whole operation, the LAN terminals 10 and 11 operate as LAN terminals (the transmission destination address “100.100.10 shown in FIG.
0.111 "), first, a packet for inquiring the dial-up router device 1 about the destination LAN terminal name is transmitted. The transmission destination address acquired by this inquiry is registered, and thereafter, the communication packets storing the transmission destination address are transmitted from the LAN terminals 10 and 11 to the dialup router device 1, and the other side LAN packet is transmitted.
Is connected to the LAN terminal of the destination address accommodated in.

In this operation, first, the LAN interface unit 2 of the dialup router 1
It receives the inquiry packets from 0 and 11 and sends them to the discrimination unit 3. The determination unit 3 determines whether the input inquiry packet is for executing name address resolution, or
It is determined whether the connection is for connection with a LAN terminal accommodated in the other LAN through the WAN. In the case of a query packet for executing name address resolution, this query packet is sent to the name address resolution unit 6. Also, W
In the case of connection with the destination address (the other LAN terminal) through the AN, an inquiry packet is sent to the routing engine unit 4.

The name address resolving unit 6 checks the LAN terminal name in the inquiry packet in the case of executing the name address resolving by searching the destination name column of the name routing table 7 shown in FIG. When the LAN terminal name is obtained by this check, the connection is made to the connection transfer destination corresponding to the LAN terminal name through the control of the WAN control unit 8 and the interface processing of the WAN interface unit 9.

By this connection, the address of the dedicated LAN terminal capable of performing name address resolution on the LAN on the transmission destination side (the other side) is notified from the connection transfer destination. The WAN control unit 8 fetches the notified LAN terminal address through the WAN interface unit 9. WAN
The control unit 8 and the name address resolution unit 6 further transmit an inquiry packet for name address resolution to the fetched LAN terminal address, and receive a reply packet. The resolved address stored in the reply packet, that is, the destination address corresponding to the destination name is registered in the corresponding destination address column of the name routing table 7 shown in FIG. I do. Thereafter, the name address resolution unit 6 and the WAN control unit 8 store the transmission destination address in the response packet, and transmit it to the LAN terminals 10 and 11 through the determination unit 3 and the LAN interface unit 2.

When the LAN terminals 10 and 11 receive the reply packet from the dialup router 1, the LAN terminals 10 and 11 transmit a communication packet having the resolved address of the reply packet as the destination address. Is input to the routing engine unit 4 through the LAN interface unit 2 and the determination unit 3. The routing engine unit 4 searches the destination address stored in the communication packet from the destination address column of the name routing table 7 and sends the WAN to the matched connection transfer destination.
The control unit 8 is connected through the WAN interface unit 9 to transfer a communication packet. If the destination address does not match any of the destination addresses in the name routing table 7, the communication packet can be transmitted to the connection transfer destination with reference to the destination address in the address routing table 5.

Next, this operation will be described with a specific example. At the start of operation, the name routing table 7
And the transmission destination address column is unregistered. First, the LAN terminals 10 and 11 transmit the destination name “tk” registered first in the name routing table 7.
y1. tky. any. com ", an inquiry is made for the destination address for this destination name. That is, an inquiry packet for executing name address resolution is sent to the dialup router device 1.

In the dialup router device 1, the discriminating unit 3 fetches the inquiry packet through the LAN interface unit 2, determines whether the inquiry packet is for executing name address resolution, and determines whether the inquiry packet is for executing name address resolution. In this case, this inquiry packet is sent to the name / address resolution unit 6. Name address resolution unit 6
Then, the destination name “tk” in the name routing table 7
y1. tky. any. com ", the connection transfer destination" 03-1000-0001 "is obtained.

Further, the name address resolution unit 6 sends a packet of the connection transfer destination “03-1000-0001” to the WAN control unit 8. The WAN control unit 8 transmits the connection transfer destination “03-1000-00” through the WAN interface unit 9.
01 ". After this connection is completed, the dedicated LAN accommodated in the LAN on the other side (destination side) (not shown) capable of executing name address resolution by this connection
The terminal address is notified from the connection transfer destination, and this LAN
The terminal address is set to W through the WAN interface unit 9.
The AN control unit 8 takes in the data and sends it to the name address resolution unit 6. The WAN control unit 8 and the name address resolution unit 6 send the destination name “tky1.tk” to the LAN terminal address.
y. any. com ”(the destination LA)
N) to send an inquiry packet to obtain
The data is transmitted through the AN interface unit 9.

Thereafter, the L stored in the LAN (not shown)
The destination name “tky1.tk” from the AN terminal address
y. any. The response packet storing the destination address “100.100.100.111” shown in FIG.
The AN control unit 8 takes it in. The WAN control unit 8 sends the destination name “tky1.tky.tky.
any. com ", the destination address" 100.
100.100.111 ”is sent to the name / address resolution unit 6, and the name / address resolution unit 6 registers it in the destination address column of the name routing table 7. Then, the name address resolution unit 6 determines that the destination address “100.10
The resolved packet (answer packet) storing “0.10.11” is determined by the determination unit 3 and the LAN interface unit 2
To the LAN terminals 10 and 11 through.

The LAN terminal 1 that has received this reply packet
0 and 11 are the reply destination names "tky1.tk
y. any. com ", the transmission destination address" 100.10
A communication packet for normal communication storing “0.10.11” is sent to the dialup router device 1. In the dialup router device 1, the discrimination unit 3 judges this communication packet through the LAN interface unit 2 and sends it to the routing engine unit 4. The routing engine unit 4 searches for the transmission destination address in the name routing table 7, and in this search, the connection transfer destination “03-1000-0”.
001 "is found. This connection transfer destination "03-1000
−0001 ”is transmitted to the routing engine unit 4
Is transmitted to the WAN control unit 8 and transmitted through the WAN interface unit 9.

After the connection completion notification, the communication packet is transferred to the LA on the other side of the destination address through a WAN (not shown).
Transfer to N terminals. After the connection completion notification, the WAN
Is received by the WAN interface unit 9, the routing engine unit 4, the determination unit 3 and the L
LAN terminals 10 and 1 through AN interface unit 2
1 and finally the destination name "tky1.tk
y. any. com ", and the communication is executed.

As described above, in the first embodiment, the name routing table 7 is provided with the respective LANs of the destination name, the destination address, and the connection transfer destination. This transmission destination address is obtained by executing name address resolution, and after registration, is connected to the transmission destination address by dialup routing. As a result, even if the destination name is not changed and only the destination address is changed, it is not necessary to change the registered contents of the routing tables of all dialup router devices. Also, the connection transfer destination of the name routing table 7 is used as an inquiry destination, and a dedicated LAN terminal for executing name address resolution to the WAN side is a LAN terminal 10, 1.
It is no longer necessary to provide them together with 1.

FIG. 5 is a block diagram showing the configuration of the second embodiment. In the second embodiment, LAN terminals 22 and 23 that operate in the same manner as the LAN terminals 10 and 11 of the first embodiment are accommodated in a LAN in the dialup router device 12.

The dialup router device 12 includes a LAN interface unit 13 that operates in the same manner as in the first embodiment.
Determination unit 14, routing engine unit 15, address routing table 16, WAN control unit 20, WAN
And an interface unit 21. Further, a name address resolution unit 1 for performing an operation corresponding to the second embodiment to acquire and transmit a transmission destination address and a connection transfer destination.
7, a name routing table 18 in which a destination name and a connection transfer destination, which are group names of a plurality of LAN terminals having the same connection transfer destination (appropriately abbreviated as a group name), and a connection transfer destination are registered in advance. And a resolved address routing table 19 in which the destination address and the connection transfer destination are registered from the name address resolution unit 17.

FIG. 6 is a diagram for explaining the registered contents of the name routing table 18 in FIG. 5, and FIG.
FIG. 9 is a diagram for explaining an initial state of a resolved address routing table 19 in FIG. FIG. 8 is a diagram for explaining the registered contents of the resolved address routing table 19 in FIG.

The name routing table 18 shown in FIG.
Has columns for destination name and connection destination,
The destination name “* .tky.any.co” described below
m / *. osa. any. com / *. ngy. an
y. com ... "and the connection transfer destination" 03-1000-00 "
01-06-1000-0002 / 052-100-0
003... "Are registered correspondingly. A destination address column in the name routing table 7 of the first embodiment, that is, a column for storing a resolved address is not provided. Note that a mark “*” in the figure indicates a group name.

The resolved address routing table 19
Is not set from the external device, and as shown in FIG. 7, in the initial state, the fields of the transmission destination address and the connection transfer destination are unregistered, and thereafter, as shown in FIG. The destination address and the connection transfer destination are registered from the solving unit 17. Here, as described later, the transmission destination address “100.100.100.11/10”
0.1100.10.112/100.100.10
0.113 ... "and the corresponding connection transfer destination" 03
-1000-0001 / 06-1000-0001 / 0
3-1000-0001 ... "has been registered. The registered transmission destination address and connection transfer destination are searched by the routing engine unit 15 as described later.

Next, the operation of the second embodiment will be described. In the operation of the second embodiment, the name address resolution unit 17 stores the group name stored in the inquiry packet from the LAN terminals 22 and 23 through the LAN interface unit 13 and the determination unit 14 into the name routing table 18 shown in FIG. For the destination name field. Connect with the connection forwarding destination corresponding to this destination name,
The reply packet is received. The operation up to this receiving operation is the same as that of the first embodiment. In the second embodiment, as shown in FIG. 8, the name address resolving unit 17 registers the destination address (resolved address) of the name queried from the reply packet in the resolved address routing table 19 together with the connection transfer destination. I do.

In the second embodiment, the routing engine unit 15 refers to the resolved address routing table 19 in order to determine a connection transfer destination of a normal communication packet from the LAN terminals 22 and 23. .

Next, the operation of the second embodiment will be specifically described. The LAN terminals 22 and 23 receive the destination name "tky".
1. tky. any. com ", it is necessary to know the LAN terminal address (transmission address) of the transmission destination of this name, and sends an inquiry packet to the dialup router device 12 for executing the name address resolution. In the dialup router device 12, the inquiry packet is input to the name address resolution unit 17 through the LAN interface unit 13 and the determination unit 14. The name address resolving unit 17 determines the destination name “tky1.tky.any.com” stored in the packet as shown in FIG.
Refer to the name routing table 18 in FIG.

The connection destination "03-1000-0001" that matches the group name "* .tky.any.com" is found by reference by the name address resolution unit 17. Next, the connection transfer destination “03-1000-000
1 is connected, and after the connection, the connection transfer destination "0"
A further inquiry is made to the LAN terminal accommodated in the LAN on the other side (not shown) that executes the name address resolution of "3-1000-0001", and the destination address "100.100.100.111" which is the resolved address is further inquired. To get. The resolved address dress is sent by the name address resolution unit 17 to the resolved address routing table 19 shown in FIG. 7 and registered as shown in FIG.

Thus, the resolved address is obtained,
The destination address “100.100.100.112/100.10” is set in the resolved address routing table 19.
0.100.113 ”is registered. After this registration, a reply is sent to the LAN terminals 22 and 23 that transmitted the inquiry packet via the discrimination unit 14 and the LAN interface unit 13 for the transmission destination address.

The LAN terminals 22 and 23 send out a normal communication packet storing the destination address “100.100.100.111” to the dialup router device 12. In the dialup router device 12, a communication packet is input to the routing engine unit 15 through the LAN interface unit 13 and the determination unit 14. The routing engine unit 15 refers to the resolved address routing table 19, connects to the connection transfer destination that matches the transmission destination address through the WAN control unit 20 and the WAN interface unit 21, and transfers the communication packet. Note that the destination name "tky2.tky.any.com"
In the case of, only the resolved address is changed, and communication by the connection becomes possible through execution of the same name address resolution as in the case of the destination name "tky1.tky.any.com".

As described above, in the second embodiment, dialup routing of group names of a plurality of LAN terminals having the same connection transfer destination can be set.

[0057]

As is apparent from the above description, according to the dialup router device of the present invention, a resolved address is obtained and registered from the name of the LAN terminal, and then the dialup routine is performed based on the destination name. Have been working.
As a result, operability in connection to the destination address is improved. Furthermore, it is not necessary to provide a terminal for performing name address resolution on one LAN, and the size of the device can be reduced.

According to the dialup router device of the present invention, a resolved address is obtained and registered from the group names of a plurality of LAN terminals having the same connection transfer destination, and thereafter, the dialup is performed based on the destination name. I am doing routine. As a result, the operability is improved as described above, and
The apparatus scale can be reduced, and dialup routing can be performed from a group name of a plurality of LAN terminals having the same connection transfer destination.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a dialup router device according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining the contents of an address routing table in the first embodiment.

FIG. 3 is a diagram for explaining an initial setting state of a name routing table in the first embodiment.

FIG. 4 is a diagram for explaining a registration state of a destination address in a name routing table in the first embodiment.

FIG. 5 is a block diagram illustrating a configuration of a second embodiment.

FIG. 6 is a diagram for explaining registered contents of a name routing table in the second embodiment.

FIG. 7 is a diagram for explaining an initial state of a resolved address routing table in the second embodiment.

FIG. 8 is a diagram for explaining registered contents of a resolved address routing table in the second embodiment.

[Explanation of symbols]

 1,12 Dialup router device 2,13 LAN interface unit 3,14 Discrimination unit 4,15 Routing engine unit 5,16 Address routing table 6,17 Name address resolution unit 7,18 Name routing table 8,20 WAN control unit 9 , 21 WAN interface unit 10, 11, 22, 23 LAN terminal 19 Solved address routing table

Claims (6)

(57) [Claims] 1. A dialup router device connected by a dialup routing from a LAN terminal accommodated in one LAN to a LAN terminal accommodated in the other LAN through a network. Connects to the connection transfer destination corresponding to the LAN terminal name on the other side, receives the address of the terminal on the other LAN for performing name address resolution notified from the connection transfer destination, and stores the destination address in the terminal address. A dialup router device comprising: a name address resolution executing means for notifying the LAN terminal name and acquiring and registering the resolved address and connecting to the registered destination address by dialup routing. 2. The diagram according to claim 1, wherein the name address resolution executing means acquires the destination address of the other side based on the name of the LAN terminal and the connection transfer destination registered in advance on the other side. Lap router device. 3. A LAN interface unit for performing an interface process with a LAN terminal as the name address resolution executing means, and determining an inquiry about execution of name address resolution from the LAN terminal through the LAN interface unit.
A determining unit for transmitting the received packet to the LAN terminal through the LAN interface unit; a name routing table in which a destination name, a destination address, and a connection transfer destination are registered correspondingly; A routing engine unit that searches the name routing table for a connection transfer destination of a destination address stored in a packet and sends the connection destination, and a destination address and a connection transfer destination searched by the routing engine unit are registered and associated with each other. An address routing table, a name address resolution unit for performing a name address resolution for acquiring a destination address registered in the name routing table, a call control for the destination address from the LAN terminal, and Control for notifying the connection result to the LAN terminal A network control unit that performs, die wrap router device of claim 1, wherein a network interface unit for processing an interface with the network, characterized in that it comprises for. 4. A dialup router device connected by a dialup routing from a LAN terminal accommodated in one LAN to a LAN terminal accommodated in the other LAN through a network, wherein the one LAN terminal sends out. A LAN on the other side for connecting to a connection transfer destination having a group name of a plurality of LAN terminals having the same connection transfer destination corresponding to the name of the LAN terminal of the transmission destination and performing the name address resolution notified from the connection transfer destination Receiving the address of the terminal, and notifying the received terminal address of the destination LAN terminal name to acquire and register the resolved address, and connecting to the registered destination address by dialup routing. A dialup router device comprising execution means. 5. The method according to claim 1, wherein the name address solution executing means acquires and registers a transmission destination address and a connection transfer destination based on a group name and a connection transfer destination of a plurality of LAN terminals on the other side registered in advance. The dialup router device according to claim 4, wherein 6. The name address resolution executing means includes a LAN interface unit for performing an interface process with a LAN terminal, a destination name and a connection transfer destination which are group names of a plurality of LAN terminals having the same connection transfer destination. A name routing table to be registered as a request, and a query to execute name address resolution from the LAN terminal through the LAN interface unit.
Alternatively, a discrimination unit for transmitting the received packet to the LAN terminal through the LAN interface unit, and a connection transfer destination of a destination address stored in the packet from the LAN terminal is retrieved from the name routing table and transmitted. A routing engine unit, an address routing table in which a destination address searched by the routing engine unit and a connection transfer destination are registered correspondingly, and a name address resolution for acquiring the destination address registered in the name routing table Executing a call control for the destination address from the LAN terminal, a resolved address routing table in which the destination address and connection transfer destination from the name address resolution unit are registered, and The connection result to the LAN end A network control unit for controlling the notification to, die wrap router device according to claim 4, characterized in that it comprises a network interface unit for processing an interface with the network.