JPH04154330A - Network address competition avoiding system - Google Patents

Abstract

PURPOSE:To avoid the competition of a network address by informing the change of a utilization state of the network address on the computer in use to the other host computer and allowing its computer to store it. CONSTITUTION:An informing means 140 informs a facto that a host computer 100 uses a network address (a) to a host computer 200 through a communication distribution processor 300. When the notice from the host computer 100 is received, in the host computer 200, a communication managing means 210 actuates an investigating means 230. The investigating means 230 decides whether it is the inquiry of the utilization state of a network address or a notice related to the change of the utilization state of the network address, and since it is the notice related to the change of the utilization state of the network address, it is stored that the network address (a) for which the start of the utilization is informed is being used by the other host computer 100.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a network address conflict avoidance method, and in particular, the present invention relates to a network address conflict avoidance method, and particularly when a plurality of host computers are connected to one or more communication distributed processing devices and a plurality of communication devices via a public network. This paper relates to a network address conflict avoidance method in a network system that is currently being used.

(Prior Art) Conventionally, in a network system, there is no method for avoiding network address conflicts, and when a network address conflict is detected, the call setup that caused the conflict is caused to fail.

[Problem that the invention attempts to solve]

In the conventional network system described above, there is no way to avoid network address conflicts, so when a network address conflict is detected, the call setup that caused the conflict simply fails, and the call setup has to be restarted. There is a drawback.

In view of the above-mentioned points, an object of the present invention is to notify and store changes in the usage status of a network address on a host computer to other host computers, and to store the changes when a network address is allocated on another host computer. An object of the present invention is to provide a network address conflict avoidance method that avoids network address conflicts by referring to the usage status of network addresses currently available.

[Means to solve the problem]

The network address conflict avoidance method of the present invention is applicable to a network system in which a plurality of host computers are connected to one or more communication distributed processing devices and a plurality of communication devices via a public network, in which a host computer communicates with a communication device. notification means for notifying other host computers of changes in the usage status of network addresses when starting and ending the process; an investigation means for investigating whether a seven-note work address to be assigned on the host computer is in use on another host computer;
address assignment means that allocates a unique network address as a network system to the communication device on its own host computer while querying the investigation means;
and communication management means for controlling communication with the communication device using the network address assigned by the address assignment means.

[Effect]

In the network address conflict avoidance method of the present invention, the notification means notifies other host computers of a change in the usage status of the network address when the own host computer starts and ends communication with the communication device, and the investigation means It memorizes changes in the usage status of network addresses notified from the notification means of the convenience store, investigates whether the network address to be assigned on the own host computer is in use on another host computer, and assigns the address. The means allocates a unique network address as a network system to the communication device on its own host computer while inquiring the investigating means, and the communication management means controls communication with the communication device using the network address allocated by the address allocating means.

〔Example〕

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a network system to which a network address conflict avoidance method according to an embodiment of the present invention is applied. This network system includes two host computers 100 and 200,
A communication distributed processing device 300 connected to the host computers 100 and 200, a public network 400 connected to the communication distributed processing device 300, and a communication distributed processing device 300 connected to the public network 400.
It is composed of three communication devices 500, 600 and 700.

The host computers 100 and 200 have communication management means 110 and 210, address assignment means 120 and 220 that assign network addresses to each communication device 500, 600 and 700, and investigate whether the network address is in use by another host computer. investigating means 130 and 230 for checking, and notifying means 14 for notifying other host computers when there is a change in the usage status of a network address on the own host computer.
0 and 240.

Referring to FIG. 2, the processing of the investigation means 130 and 230 includes a judgment step S1 for determining whether the inquiry is about the usage status of a network address or a notification regarding a change in the usage status of the network address, and the use of the network address of another host computer. It consists of an investigation/response step S2 for investigating the situation and answering whether the corresponding network address is usable or not, and a storage step S3 for storing notifications regarding changes in the usage status of the network address from other host computers.

Next, the operation of the network address conflict avoidance system of this embodiment configured as described above will be explained.

First, assume that the communication device 500 starts communicating with the host computer 100 via the public network 400. Note that the communication at this time may be a call originating from the host computer 100 or an incoming call to the host computer 100.

In the host computer 100, when starting communication with the communication device 500, the communication management means 110 activates the address assignment means 120.

The address allocating means 120 allocates network addresses that are not in use while repeatedly inquiring the investigating means 130 about the usage status of the network addresses.

The investigating means 130 determines whether the notification is a change in the network address usage status or a notification regarding a change in the network address usage status (step Sl). Address allocation means 120 investigates the usage status of the network address to be used and determines whether it is usable or not.
(Step S2).

Assume now that the address assignment means 120 assigns a certain network address a to the communication device 500.

Then, the communication management means 110 activates the notification means 140.

The notification means 140 notifies the communication distributed processing device 30 that the host computer 100 uses the network address a.
0 to the host computer 200.

In the host computer 200, the host computer 1
Upon receiving the notification from 00, the communication management means 210:
The investigation means 230 is activated.

The investigating means 230 determines whether the notification is about a change in the usage status of the network address or not (step S1), and since the notification is about a change in the usage status of the network address, Network address a whose start was notified
is in use by another post computer 100 (step S3).

Next, assume that the communication device 600 starts communicating with the host computer 200 via the public network 400.

In the host computer 200, when starting communication with the communication device 6°O, the communication management means 210 activates the address assignment means 220.

The address allocating means 220 allocates a network address that is not in use (in this case, other than network address a) while repeatedly inquiring the investigating means 230 about the usage status of the network address.

The investigating means 230 determines whether the notification is about a change in the network address usage status (step Sl), and determines whether the notification is about a change in the network address usage status. The address allocation means 220 investigates the usage status of the network address to be used and determines whether it is usable or not.
(Step S2).

Assume now that the address assignment means 220 has assigned a network address b (≠a) to the communication device 600.

Then, the communication management means 210 activates the notification means 240.

The notification means 240 notifies the communication distributed processing device 30 that the host computer 200 uses network address b.
0 to the host computer 100.

In the host computer 100, the host computer 2
Upon receiving the notification from 00, the communication management means 110:
The investigation means 130 is activated.

The investigating means 130 determines whether the notification is an adjustment to the usage status of the network address or a change in the usage status of the network address (Step S1). Network address b for which the start was notified
is in use by another host computer 200 (step S3).

Suppose then that the communication device 500 ends communication with the host computer 100.

In the host computer 100, the communication (ε management means 110
starts the notification means 140.

The notification means 140 notifies the host computer 200 via the communication distributed processing device 300 that the host computer 100 has finished using the network address a.

In the host computer 200, the host computer 1
Upon receiving the notification from 00, the communication management means 210:
The investigation means 230 is activated.

The investigating means 230 determines whether the notification is an adjustment to the usage status of the network address or a notification regarding a change in the usage status of the network address (step S1). Network address a that was notified of termination
is not in use by another host computer 100 (step S3).

In this way, it is possible to avoid conflict between the seven network addresses in the two host computers 100 and 200.

In the above embodiment, the case where there are two host computers has been described, but it goes without saying that the present invention is equally applicable even when there are three or more host computers.

〔Effect of the invention〕

As explained above, the present invention provides a host computer with a notification means, a tA check means address allocation means, and a communication management means, so that changes in the usage status of the network address used by the own host computer can be made to other host computers. When assigning a network address, the local host computer can refer to the usage status of 7 work addresses on other host computers and avoid network address conflicts, resulting in call setup failures due to network address conflicts. This has the effect of making it disappear.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing the configuration of a network system to which a network address conflict avoidance method according to an embodiment of the present invention is applied, and FIG. 2 is a flowchart showing the processing of the investigation means in FIG. be. In the diagram, 100.200 host computer, 110.210
- Communication management means, 120.220 Address assignment means, 130.230
- Investigation means, 140.240 - Notification means, 300... Communication distributed processing device, 400... Public network, 500.600,700 - Communication device, Sl... Judgment step, S2... Investigation・Answer step, S3... ・This is a memory step.

Claims (1)

[Claims] In a network system in which a plurality of host computers are connected to a plurality of communication devices via one or more communication distributed processing devices and a public network, when the own host computer starts communication with the communication device. and a notification means for notifying other host computers of the change in the usage status of the network address when the computer is terminated; An investigation means for investigating whether a network address to be assigned is in use on another host computer; and an address assignment means for allocating a unique network address as a network system to a communication device on its own host computer while inquiring this investigation means. and communication management means for controlling communication with a communication device using the network address assigned by the address assignment means.