JP2002290617A - Dial-up router load sharing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system in which user side and center side networks are connected through a dial-up router to a dial line network, capable of sharing the load of a dial-up router arranged at a center side. SOLUTION: Pakcet data transmitted through a center side dial-up router 2 are detected by a load sharing device 1, and the line using state of each user is managed, the using situation of the number of public network channels connected to the center side is grasped, and path information to be used at dial-down from a server is dynamically set at the dial-up router having a dead channel, so that load sharing can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a router device for relaying a data packet. The present invention relates to a router device for relaying a data packet. The present invention relates to a technology for distributing a load.

[0002]

2. Description of the Related Art A conventional remote network using a dial-up network will be described. For example,
In a network configured by connecting a dial-up line such as an ISDN line or an ISDN line network, and a dial-up line network to a plurality of local area networks (hereinafter, referred to as LANs), a center is first connected from a user side LAN to a center. The case of dialing up to the local LAN will be described.

[0003] In many cases, a LAN on the center side, which receives a large number of dial-up connections from a plurality of users, provides a representative service with a public network such as an ISDN network. The representative number on the center side transmitted from is controlled by a control within the public network to receive an incoming call from a plurality of subscriber line numbers attached to the representative number to an appropriate vacant line. At this time, each subscriber line number corresponds to each center-side dial-up router on the center side. From the viewpoint of the end user, there is no need to be aware of multiple lines, so convenience is high. Even in a LAN, it is possible to realize load distribution of a plurality of dial-up routers.

[0004] The center-side dial-up router receiving the data packet from the user negotiates with the source user-side dial-up router in the data link layer and dials up the IP address pooled in the center-side router. Assigned to the router.

Next, a description will be given of dial-down transmission from the center to the user side. As a premise, the server on the center side holds the IP address (network address) of each user and the telephone number information corresponding to this in a table format, and as the routing information, the IP address of the user for each user.
It has static route information by assigning one center-side dial-up router to an address. Then, when making a dial-down connection from the center to the user, the server indexes the address of the output center dial-up router from the user's IP address and outputs the packet data to the LAN. Each center-side dial-up router has the table of the IP addresses of all the users and the telephone numbers of the users corresponding to the IP addresses, and transmits only its own packet data to the telephone number corresponding to the IP address of the user. Dial-down connection is executed.

[0006] Similarly to the above, the access point of the Internet Service Provider normally makes a dial-up connection from the user-side router to one telephone number of the access point and determines which router receives the call on the public network side. whether any center-side dial-up router to call to find a free channel in the representative handling service is unknown. The arriving router gives the pooled IP address to the user-side router, and a plurality of users can communicate using the IP address. When communication is completed and the line is disconnected, the IP address is released.

A line can be accommodated by directly connecting a terminal adapter (TA) instead of the dial-up router on the user side. In this case, similarly, communication is performed by statically assigning an IP address to the TA. it is possible.

[0008]

However, in the above-mentioned conventional system, dial-down connection is performed based on route information statically described for each dial-up router. It has the disadvantage that it cannot be controlled.

[0009] In addition, the public line that can be used by each user can share only the number of dial-up routers that are statically registered, and thus has the disadvantage that the public line cannot be used efficiently.

Accordingly, an object of the present invention is to provide a load distribution function capable of dynamically selecting a route to a plurality of dial-up routers even in a dial-up / down connection for a user who statically describes route information. Is to do. Another object of the present invention is to provide an efficient load distribution function by managing the communication state of each user and grasping the line use state of each dial-up router.

[0011]

Means for Solving the Problems] According to the first aspect of the invention, communications and dial-up line and dial line network, a plurality of networks and a user side of the network and the center side of the network is the dial-up router A load detecting means for the center-side dial-up router in a network system connected through a device, wherein the packet detecting means detects packet data flowing on the center-side network at a predetermined timing; and A communication state management means for managing a communication state of each user and a line use state of a dial-up router arranged at the center side by analyzing a network address of the user; and executing a dial-down connection from the server side to the user. The sensor And a route control unit for dynamically changing the route information describing the communication side dial-up router according to the communication state of each user analyzed by the communication state management unit and the line use status of the dial-up router. Thus, it is possible to obtain a load balancer for a center-side dial-up router.

[0012] According to the second aspect of the present invention, the route control means registers the dial-up router having a small load as the route information for the user when packet data of the user is newly detected. A load distribution device for a center-side dial-up router according to claim 1 can be obtained.

According to the third aspect of the present invention, when the packet data of the user has not been detected for a predetermined period of time, the route control means transmits the center-side dial-up router registered for the user to the route information. 3. The load balancing device for a center-side dial-up router according to claim 1 or 2, wherein

According to the fourth aspect of the present invention, a network in which a dial-up line and a dial line network, and a plurality of networks including a user-side network and a center-side network are connected through a communication device of a dial-up router. A computer-readable recording medium recording a data communication program applied to a system, comprising: a first step of detecting, at a predetermined timing, packet data flowing over a network on the center side; A second step of managing the communication status of each user and the line use status of the dial-up router arranged on the center side by analyzing the network address of the user, and executing a dial-down connection from the server side to the user. The sensor A third step of dynamically changing the route information describing the local dial-up router according to the communication state of each user analyzed in the second step and the line use status of the dial-up router; And a computer-readable recording medium on which a data communication program for causing a computer to execute the program is recorded.

According to the invention described in claim 5, the third step is a step of registering the dial-up router with a small load as route information for the user when packet data of the user is newly detected. A computer-readable recording medium on which the data communication program according to claim 4 is recorded can be obtained.

According to the invention described in claim 6, in the third step, when packet data of the user is not detected for a predetermined time, the center-side dial-up router registered for the user is connected to the route. it is possible to obtain a computer-readable recording medium recording a data communication program according to claim 4 or 5, wherein characterized in that it comprises a step of deleting the information.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a load distribution device for a dial-up router according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a network system provided with a dial-up router according to the present invention. In the communication system of FIG. 1, the server terminal 6, the dial-up router load distribution device 1, and the center-side dial-up router 2 are connected to a LAN 5. Further, the user terminal and the user side dial-up router 3 are connected to the LAN. Further, the center side dial-up router 3 is connected to the LAN. Further, the center-side dial-up router 2 and the user-side dial-up router 3 are connected to a public line network 4.

The user terminal holds the IP address (network address) of the server terminal 6 and a representative telephone number corresponding to the IP address.

The center-side dial-up router 2
Is the IP address (network address) of all user terminals connected to the user-side dial-up router 3
And the telephone number of the user corresponding to the IP address.

On the other hand, the dial-up router load distribution device 1 detects the packet data flowing on the LAN 5 and the network interface 11 serving as an input / output unit for the LAN 5 and detects the load state of the dial-up router 2 on the center side. A control unit 13 and a path control unit 1 that has path information for each user and rewrites according to the load state
And 2.

The load distribution control unit 13 includes a packet detection unit 133 for detecting a data packet received through the network interface as needed, a user information list 135 for storing information on users and a non-communication timer value,
A communication state management unit for analyzing the packet detection result with reference to the user information list and detecting a communication state of a user;
32, a gateway address of the dial-up router 2 and 134 for holding the number of public network channels, and dynamically changing the route information when the communication state of the user changes in consideration of the router information and the number of lines. State management unit 1
31.

Next, the operation will be described in detail. The state management unit 131 performs the following processing to correct the path information. That is, the processing sequence is executed according to the flow shown in FIG.

The state management unit 131 reads the gateway address information of each center-side dial-up router 2 registered in the center-side dial-up router information list 134 and the number of public network channels.

The communication state management unit 132 reads the IP address (network address) of the end user registered in the user information list 135 and the non-communication timer information.

The packet detecting section 133
Is measured, and the result is notified to the communication state management unit 132.

The communication state management unit 132 analyzes a network address from all traffic information passing through the load distribution device detected by the packet detection unit 133,
The traffic situation occurring between the center and the user is constantly managed. The communication state management unit 13 manages the communication state of each user, and when the line use state of each user changes, the state management unit 13
Notify 1. Specifically, when traffic to the user occurs and when there is no traffic to the user for a certain period of time (no-communication timer value), the state management unit 131 is notified that the line use state has changed.

The state management unit 131 registers and deletes the path information existing in the path control unit 12 when the line use state changes for each user.

The registration of the routing information is performed when a packet of the user is detected newly, the number of users connected to the center side dialup router determines availability of public network channels, the appropriate one Selected and executed. The route information is deleted when it is detected that the traffic of the user has changed for a certain period of time and the line use state has changed.

Next, referring to FIG.
The operation in which the status management unit 131 in the inside registers the route information in the route control unit 12 will be described. FIG. 2 shows the state management unit 13.
1 is a flow chart showing an example operational flow for registering the routing information in the routing control unit 12.

The communication state management unit 132 analyzes traffic from the measurement result of the packet detection unit 133 (step A1).

As a result of the traffic analysis, it is determined whether or not a target user exists (step A2).

If the result of the determination in step A2 is a match, it is determined whether or not there is route information corresponding to the user (step A3).

As a result of the determination in step A3, if they match, data transfer (step A7) is carried out based on the route information (actual data is transferred to the dial-up router 2 conforming to the routing information). If they do not match,
Whether the available public line channel exists makes the determination (step A4).

If the result of the determination in step A4 is that they match, the center side dial-up router is selected (step A4).
5) Register the route information (step A6) and execute data transfer (step A7) based on the route information.

If the result of the determination in steps A2 and A4 is that they do not match, a reply indicating that there is no route is returned by an ICMP message (step A8).

Next, the load distribution control unit 13 with reference to FIG. 3
The operation in which the status management unit 131 in the inside deletes the route information in the route control unit 12 will be described.

FIG. 2 shows that the state management unit 131
Is a flow chart showing an example operational flow for deleting the routing information in the.

The packet detector 132 constantly monitors the line use status of each user (step B1).

It is determined whether there is no traffic generated for each user for a certain period of time (step B2).

If the result of determination in step B2 is that they match, the path information for the target user is deleted (step B3). When performing a dial-up / down connection, it is usually limited to one of the center side router. If the IP routing information is not set to one, the route differs between the outgoing and returning data packets, causing problems such as the use of two channels of INS (registered trademark) lines. The above registration is registration of routing information. By registering the routing information, it is determined to which center-side router the IP packet addressed to the user should be forwarded, and then forwarded. The center-side dial-up router communicates by sending a call to the user-side dial-up router based on the address of the transferred IP packet. (It is assumed that all center-side routers have routing information of all users). After the above deletion, there is no registration of routing information, so select the center side router. afterwards,
Register routing information and transfer IP packets.

As another embodiment of the present invention, by linking the monitoring function of the center-side dial-up router 2 with the router information list, it is possible to cope with a failure of the center-side dial-up router 2 and improve reliability. It can be reduced to become.

The server has the function of the above-described dial-up router load distribution device, and the server itself detects packet data flowing on the network on the center side to dynamically change the route information. May be.

Further, the dynamic change of the path information described above is a technique that can be executed by software.

[0044]

As described above, the present invention has the following effects. The first effect is that a plurality of center-side dial-up routers can be dynamically used. The reason is that this dial-up router load balancer manages the line usage status for each user and grasps the usage status of the number of public network channels connected to each center-side dial-up router, so that the available channels can be dynamically allocated. This is because there is a dial-up router is the route selection.

A second effect is that the center dial-up router can be used dynamically without performing any special processing. The reason for this is to have a communication state management unit and to grasp the line use state for each user in the present apparatus.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment according to the present invention.

FIG. 2 is a flowchart showing an example of a load distribution operation flow according to the present invention.

FIG. 3 is a flowchart illustrating an example of a path information correction operation blow according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dial-up load distribution apparatus 11 Network interface 12 Route control part 13 Load distribution control part 131 State management part 132 Communication state management part 133 Packet detection part 134 Center side dial-up router information list 135 User information list 2 Center side dial-up router 3 User side dial-up router 4 Public line network 5 LAN 6 Server

Claims (6)

[Claims] 1. A center-side dial-up router in a network system in which a dial-up line and a dial line network, and a plurality of networks including a user-side network and a center-side network are connected through a communication device of the dial-up router. A packet detecting means for detecting packet data flowing on the center side network at a predetermined timing,
A communication state management unit that manages a communication state for each user and a line use state of a dial-up router disposed on the center side by analyzing a network address of the detected packet data; and Route information describing the center-side dial-up router through which a dial-down connection is executed is analyzed according to the communication status of each user analyzed by the communication status management means and the line usage status of the dial-up router. A load balancing device for a center-side dial-up router, comprising: a route control unit that dynamically changes. 2. The routing control means according to claim 1, wherein, when packet data of the user is newly detected, the dial-up router having a small load is registered as the routing information for the user. Load balancer for the center-side dial-up router. 3. The method according to claim 2, wherein the route control means deletes a center dial-up router registered for the user from the route information when the packet data of the user has not been detected for a predetermined time. Claim 1
Or the load balancing device of the center-side dial-up router according to 2. 4. A data communication program applied to a network system in which a dial-up line and a dial line network, and a plurality of networks including a user-side network and a center-side network are connected through a communication device of a dial-up router. A first step of detecting packet data flowing on the center-side network at a predetermined timing, and analyzing a network address of the detected packet data. A second step of managing a communication state for each user and a line use status of a dial-up router arranged on the center side, and the center-side dial through which a dial-down connection is made from the server side to the user Up router For performing a third step of dynamically changed in accordance with the described routing information to the line usage of the dial-up router and the communication state for each of the users that are analyzed by the second step, to the computer A computer-readable recording medium on which the data communication program is recorded. 5. The method according to claim 3, wherein the third step includes a step of registering the dial-up router with a small load as route information for the user when packet data of the user is newly detected. Item 7. A computer-readable recording medium recording the data communication program according to Item 4. 6. The third step includes, when packet data of the user has not been detected for a certain period of time, deleting a center-side dial-up router registered for the user from the route information. A computer-readable recording medium on which the data communication program according to claim 4 is recorded.