JPH06141032A - Lan fault intervening device - Google Patents

Abstract

PURPOSE:To complete the meaningless re-transmission of multi-address data and to prevent communication efficiency on a local area network (LAN) from being lowered by issuing a false response to the multiple address data re-transmitted frequently. CONSTITUTION:A LAN monitoring means 3 monitors the multiple address data received from the LAN and response data for that via a LAN communication controller 2, and stores the transmission origin node information of each mltiple address data, the number of times of re-transmission, and response request destination node information on the LAN. Furthermore, the means 3 monitors the communication efficiency of all the data on the LAN, and instructs the transmission of false response data to a false response means 4 by detecting the multiple address data for a response request node in which the number of times of re-transmission exceeds a prescribed value when the communication efficiency goes less than a regulated value. The means 4 generates the false response data including the medium access control address of a LAN fault intervening device 1 itself, and transmits it to a transmission origin node. Thereby, the re-transmission of the multiple address data can be completed, which prevents the communication efficiency on the LAN from being lowered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a LAN failure intervention device, and more particularly to TCP (Transmission Control Protocol) / I.
In a local area network (hereinafter referred to as LAN) that uses P (Internet Control) as a communication protocol, a LAN that prevents a significant decrease in communication efficiency due to heavy use of broadcast data correctly defined in the communication protocol.
Obstacle intervention device.

[0002]

2. Description of the Related Art In the TCP / IP communication protocol, when it is desired to transmit data from a node # 1 on a LAN to a node # 2 and the medium access control address used for designation of the destination is unknown, FIG. As shown in (a),
Data including the IP address of node # 2 is broadcast data 8
And send it to all nodes. When the IP address in the data is its own IP address, the node # 2 receiving this broadcast data 8 sends the response data 9 including its own medium access control address to the node # 2 as shown in FIG. 2B. Send back to 1. After that, the node # 1 transmits the necessary data to the node # 2 by using the received medium access control address of the node # 2.

When the node # 1 does not exist on the LAN or transmits the broadcast data using the IP address of the node X which is in a dormant state, the response data from the node X cannot be received, and therefore the broadcast data is transmitted a prescribed number of times. repeat. If there is still no response, it is determined that the corresponding node does not exist on the LAN or is in the dormant state, and the broadcast process is terminated.

[0004]

As described above, the LA
When broadcast data targeted for a node not operating on N is repeatedly transmitted from a plurality of nodes, the communication amount on the LAN remarkably increases and the data communication efficiency decreases, which makes communication practically difficult. Become. However, since there is no effective avoidance procedure on the communication protocol, there is a problem that the LAN remains in a communication difficult state.

An object of the present invention is to provide a LAN failure intervention device for preventing a significant decrease in communication efficiency due to heavy use of broadcast data correctly defined in a communication protocol.

[0006]

The LAN failure intervention apparatus of the present invention is connected to a local area network using TCP / IP as a communication protocol, and the communication efficiency on the network and the address notification request defined in the communication protocol. LAN monitoring means for monitoring the broadcast data and the response data for it, and issuing an instruction when the broadcast data matching the predetermined condition is detected when the communication efficiency falls below the predetermined value, and LAN
Pseudo response means for creating and transmitting pseudo response data for stopping the retransmission of the broadcast data designated by the instruction of the monitoring means, and communication data transmitted corresponding to the pseudo response data are stored and saved. Communication history storage means for
It comprises a status notification means for displaying or notifying the communication data and the pseudo response status stored in the communication history storage means upon request.

[0007]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

As shown in FIG. 1, a LAN fault intervention apparatus 1 of this embodiment is connected to a cable for a local area network, and a LAN communication controller 2 for controlling data transmission / reception to / from the LAN and a LAN communication controller on the LAN. LAN for monitoring communication efficiency, broadcast data and response data
The monitoring means 3, the pseudo response means 4 for transmitting the pseudo response data when the communication efficiency on the LAN falls below the specified value due to the retransmission of the broadcast data, and the LA for the pseudo response.
It comprises communication history storage means 5 for storing the communication data transmitted to the N failure intervention device 1, and status notification means 6 for displaying the simulated response status and the saved communication data on the status display 7 on request. There is.

The LAN monitoring means 3 is a LAN communication controller 2
Broadcast data (broadcast data including an IP address for requesting notification of a medium access control address defined in the communication protocol) and response data to the broadcast data received from the LAN via the The transmission source node information of each of the broadcast data, the number of retransmissions, and the designated response request destination node information (IP address) are stored until the response data for the broadcast data is received. At this time, the number of retransmissions is totaled and accumulated for each IP address of the response request destination node. That is, when the broadcast data is transmitted from a plurality of transmission source nodes to a certain response request destination node that is in a dormant state, the total number of times of retransmission of these is stored. Furthermore, the communication efficiency of all data (including broadcast data and response data) on the LAN is also monitored, and the transmission of broadcast data and response data increases, and the communication efficiency on the LAN falls below a prescribed value. In this case, when the broadcast data for the response request destination node whose number of retransmissions exceeds a predetermined value is detected, the pseudo response means 4 is instructed to transmit the pseudo response data.

Upon receiving the instruction from the LAN monitoring means 3, the pseudo response means 4 creates pseudo response data including the medium access control address of the LAN fault intervention apparatus 1 itself, and transmits it to the transmission source node. As a result, the retransmission of the broadcast data is terminated and control is performed so as to improve the communication efficiency on the LAN.

The communication data transmitted from the transmission source node to the LAN fault intervention device 1 due to the pseudo response is
The communication history storage unit 5 stores and saves the pseudo response status (source node information, response request destination node information, date and time, etc.) and displays it on the status display 7 or transfers it to the source node according to an instruction from the status notification unit 6. To be done.

As described above, it is possible to prevent a decrease in communication efficiency due to frequent occurrence of broadcast data for nodes not operating on the LAN. If the condition for instructing the transmission of the pseudo response data is set to be larger than the specified number of repeated transmissions in the communication protocol when there is no response, only the broadcast data for the response request destination node in which the broadcast data is concentrated is the pseudo response. However, if all of the retransmitted broadcast data in the case where there is no normal response by setting it smaller than the specified number of times is targeted, the effect of improving the communication efficiency will be large.

[0014]

As described above, the LAN failure intervention apparatus of the present invention terminates the unnecessary retransmission of the broadcast data by making a pseudo response to the broadcast data having a large number of retransmissions. This is effective in preventing a significant decrease in communication efficiency on the LAN. It should be noted that since no pseudo response is made to the normal broadcast data, it does not prevent the source node of the broadcast data from acquiring the normal response data. Further, since the pseudo response is performed only when the communication efficiency is lowered, the function of recognizing the absence or suspension of the target node by the specified number of retransmissions is not hindered under normal conditions.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an address acquisition function based on broadcast data.

[Explanation of symbols]

 1 LAN Fault Intervention Device 2 LAN Communication Controller 3 LAN Monitoring Means 5 Communication History Storage Means 4 Pseudo Response Means 6 Status Notification Means 7 Status Indicators 8 Broadcast Data 9 Response Data

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H04L 29/14 8220-5K H04L 13/00 313

Claims (1)

[Claims] 1. Connected to a local area network using TCP / IP as a communication protocol, the communication efficiency on the network and the broadcast data for an address report request defined in the communication protocol and the response data to the broadcast data are provided. LAN monitoring means for issuing an instruction when detecting broadcast data which meets the predetermined condition when the communication efficiency falls below a predetermined value, and the broadcast data designated by the instruction of the LAN monitoring means. Pseudo response means for creating and transmitting pseudo response data for stopping retransmission, communication history storage means for storing and saving communication data transmitted corresponding to the pseudo response data, and the communication history upon request A status notification means for displaying or notifying the communication data stored in the storage means and the pseudo response status is provided. A LAN fault intervention device characterized by: