JP2002111665A - Local area network monitoring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a local area network monitoring device which can detect automatically routers to each terminal in a route with an easy protocol and monitor integrally the network components including the routers in LAN. SOLUTION: A monitoring terminal 1-1 sends 'traceroute' command to each terminal to make each router in the delivery route return response information. Routers R1, R2, for example, return response information by the 'traceroute' to a terminal B1. Monitoring terminal 1-1 detects all routers in the LAN based on the response information and the responding order from each router to register the configuration, and the monitoring terminal also sends 'ping' command, which is used to confirm a response from the communication partner, to each of router R1 through 6 that were detected by the 'traceroute' command operations to each terminal and registered, and monitors the status (normality) of each router R1 through 6 by the situation whether the response is returned or not.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a local area network (LAN) monitoring device, and more particularly to a local area network monitoring device for automatically registering and monitoring a router constituting a local area network and its arrangement.

[0002] In recent years, the information society has rapidly progressed, and many LANs of various scales have appeared. In an extended large-scale LAN, there may be a plurality of data delivery paths to the destination terminal. When the network is duplicated to ensure operational reliability, there are at least two data delivery paths. Exists.

A LAN having a plurality of delivery routes as described above
In the above, even if a failure occurs in some routers or transmission paths, data delivery is performed without hindrance. Will be discovered only when the system is in a failure state at the same time. The present invention is designed to prevent such a situation from occurring.
The present invention relates to a local area network monitoring device for centrally monitoring network components including a router in a local area network.

[0004]

2. Description of the Related Art When monitoring nodes in a network, a simple network management protocol (SNMP) is used.
ol), the node management using a network management protocol is often performed, but the management cannot be performed on a node that does not support SNMP.

[0005]

On a LAN having a plurality of delivery routes, a router on a route to each terminal can be automatically set by a simple protocol without using an advanced protocol such as SNMP. Detect and LAN
It is an object of the present invention to provide a local area network monitoring device capable of centrally monitoring network components including a router in the network.

[0006]

In order to solve the above-mentioned problems, a local area network monitoring apparatus according to the present invention provides a trace route for confirming response information and response time from each router on a delivery route to each terminal. Use the (traceroute) command to detect routers and register them. In addition, the status (normality) of routers and terminals on the LAN is monitored using a ping command used to confirm the response of the communication partner.

That is, according to the present invention, there is provided (1) a trace route for returning response information from each router on a delivery route to a terminal on a local area network in a local area network monitoring device installed on the local area network. (Traceroute) command, and includes router detection means for detecting a router existing on the local area network based on response information from each router to the traceroute command, and address information of the detected router. Router registration means for registering router information.

[0010] (2) There is provided router status confirmation means for periodically transmitting a ping command to the router registered in the router registration means and confirming the normality of the router based on the presence or absence of a response. It is a thing.

(3) The router registration means detects the arrangement order of routers existing on the local area network based on response information from each router to the traceroute command and the response order. And means for generating and registering a router arrangement configuration.

(4) A shortest delivery route is extracted from a plurality of delivery routes based on the router configuration registered in the router registration means, and is connected to the same router as the local area network monitoring device. The best delivery route notifying means for notifying the best delivery route to the terminal.

(5) Broadcast information is transmitted to all the routers registered in the router registration means, and based on response information from the terminal to the broadcast information, the broadcast information is transmitted to the local area network. It comprises terminal detection means for detecting all existing terminals, and terminal registration means for registering terminal information including address information of the detected terminals.

(6) Grouping the information of the router registered in the router registration means and the information of the terminals registered in the terminal registration means on the basis of their address information,
Further, there is provided a means for linking and displaying the address information with the device name.

(7) A ping (ping) command is periodically transmitted to the router registered in the router registration unit and the terminal registered in the terminal registration unit. There is provided means for calculating a response rate of each router and each terminal, and totaling the response rates of each router and each terminal for each group based on the address information.

[0014]

FIG. 1 is an explanatory diagram of a router monitoring procedure according to the present invention. (A) of the figure shows a configuration example of a local area network (LAN) to be monitored, and (b) of the figure shows a trace route (tracer).
oute) shows a sequence of detecting a router on a delivery route by sending a command, and FIG. 3C shows a sequence for checking the state (normality) of the router by sending a ping command.

[0015] As shown in FIG.
A local area network monitoring device (hereinafter, referred to as a monitoring terminal) 1-1 is installed on N. As the monitoring terminal 1-1, an information terminal device or a server is used. The monitoring terminals 1-1 include terminals A1, B1, B2, C on the LAN.
1 are registered, but routers R1-R
The IP address of No. 6 has not been registered, and the arrangement configuration of the routers on the LAN is not grasped by the monitoring terminal 1-1.

Therefore, the monitoring terminal 1-1 sends a traceroute command to each registered terminal. By transmitting the traceroute command, the IP addresses of the routers are returned to the monitoring terminal 1-1 from all the routers present on the delivery route to the destination terminal.

FIG. 3B shows a case where a traceroute command is transmitted to the terminal B1. Each of the routers R1 and R2 on the delivery route from the monitoring terminal 1-1 to the terminal B1 receives an IP address. Addresses r1 and r
2 is returned to the monitoring terminal 1-1, and the monitoring terminal 1-1
The routers R1 and R2 on N are recognized. The monitoring terminal 1-1 registers router information such as the IP addresses of the recognized routers R1 and R2.

The monitoring terminal 1-1 similarly sends a traceroute command to each terminal having a known IP address, thereby transmitting each of the routers R1 to R on the LAN.
6 and register them. That is, by transmitting a traceroute command to the terminal B2, the routers R3, R4, R6, and R5 are detected, and the traceroute (trac) is transmitted to the terminal C1.
eroute) command, the router R3,
Router R4 is detected.

Here, by transmitting a traceroute command to all the terminals, duplicate routers may be detected, but by deleting the duplicated router information, All routers on the LAN are centrally registered in the monitoring terminal 1-1.

Next, the monitoring terminal 1-1 sends a ping command to each of the routers R1 to R6 detected and registered by the traceroute command periodically or as needed according to the operation status. Then, the status (normality) of each of the routers R1 to R6 is confirmed based on the presence or absence of a response to the command.

FIG. 1C shows an example in which a ping command is transmitted from the monitoring terminal 1-1 to the routers R1 and R2, and the ping command is transmitted from the router R1.
In this example, a response to the command is obtained, there is no response to the ping command from the router R2, and a timeout occurs.

The monitoring terminal 1-1 determines that the router R1 is normal because a response to the ping command is obtained from the router R1, and there is no response to the ping command from the router R2. , Router R2
It is determined that some trouble or abnormality has occurred.

Further, the monitoring terminal 1-1 accumulates the number of times a ping command is transmitted and the number of responses to the registered routers R1 to R6 in an arbitrary cycle, and calculates a response rate. From the numerical value of the response rate, it is possible to not only detect a permanent failure of the router body but also grasp a temporary failure occurrence state in the network.

Also, by transmitting a traceroute command from the monitoring terminal 1-1 to each terminal, and registering the routers in the order in which the routers are detected by the response, the arrangement configuration of the routers up to each terminal in the network is achieved. (System configuration on the LAN) can be automatically generated.

That is, in the example of the network configuration shown in FIG. 1A, the routers R1 and R2 are sequentially arranged from the monitoring terminal 1-1 to the terminal B1 according to the response order of the traceroute command. Monitoring terminal 1-
Routers R3, R4, R
6 and R5 are arranged, and routers R3 and R4 are arranged in order between the monitoring terminal 1-1 and the terminal C1.
It recognizes that the router 3 is located between -1 and the terminal A1.

The monitoring terminal 1-1 visually displays the router arrangement configuration (system configuration on the LAN) recognized on the basis of the response order of the traceroute command on the monitoring terminal screen. FIG. 2A shows a display example on the monitor terminal screen of the router arrangement configuration obtained by transmitting a traceroute command from the monitor terminal to the terminal B1.

The monitoring terminal 1-1 displays the router arrangement configuration (system configuration on the LAN), and issues an alarm for a router failure detected by the presence or absence of a response to a ping command, and blinks the failure location. Is displayed by a buzzer sound or the like. In addition, a response rate to a ping command is also displayed, and a network failure occurrence state is numerically displayed.

Further, the monitoring terminal 1-1 groups the IP addresses of the routers detected by the transmission of the traceroute command for each network according to the subnet mask, as shown in FIG. 2B. Create a database.

The router IP address in the database is linked to an arbitrary device name or device name, and the IP address of the router grouped for each network is displayed on the monitoring terminal screen together with the corresponding device name. Similarly, the IP address of each terminal is also grouped for each network by the subnet mask, linked to an arbitrary device name, and displayed on the monitor terminal screen.

After recognizing the router configuration (system configuration on the LAN) based on the traceroute, the best (shortest) delivery route from the network to which the monitoring terminal 1-1 belongs to a terminal belonging to another network is as follows. Search according to the procedure described in.

Now, it is assumed that the arrangement configuration of the router from the monitoring terminal 1-1 to the terminal B of another network is a configuration example as shown in FIG. At this time, the monitoring terminal 1-
There are two delivery routes from 1 to terminal B as follows. (I) Monitoring terminal → router R1 → router R4 → router R3
→ Terminal B (ii) Monitoring terminal → Router R1 → Router R2 → Router R3
→ Terminal B

The monitoring terminal 1-1 performs the above (i) and (ii)
Are sequentially designated, a traceroute command is transmitted to the terminal B, and the response time to each command is measured. FIG. 3B shows a trace route by specifying the delivery route of the above (i).
FIG. 3C shows the response return status when the trace route (traceroute) is performed by specifying the delivery route of the above (ii).

The monitoring terminal 1-1 determines the response time T1 of the delivery route (i) and the response time T2 of the delivery route (ii).
, And the best route with a short response time, that is, the best response is recognized. The monitoring terminal 1-1 transmits the information of the recognized best route on the same network as the monitoring terminal 1-1 (that is, connected to the same router as the monitoring terminal 1-1).
Notify other terminal A. The terminal A transmits data to the terminal B by designating the best route information notified from the monitoring terminal 1-1.

Next, a procedure for detecting all terminals connected to each network on the LAN will be described.
Trace route to each terminal on the LAN (tracer
oute) In the detection of the router by the command transmission, the monitoring terminal 1-1 does not necessarily include all the terminals A1, A2, B1,
It is not necessary to recognize the IP addresses of B2, C1, and C2, and the IP addresses of at least one terminal (at least one terminal directly connected to each router) in each network on the LAN are recognized. If you have
All routers can be detected by a traceroute addressed to those terminals.

Therefore, the monitoring terminal 1-1 transmits the broadcast information using the multicast address to each of the detected routers, and receives a response to the broadcast information from each terminal, thereby performing the broadcast. It is possible to detect the IP addresses of all terminals accommodated in the communication information transmission destination router.

FIG. 4 shows a procedure for detecting all terminals by transmitting the above-mentioned broadcast information. (A) of the figure shows an example of an arrangement configuration of all terminals to be detected on a LAN. (B) of FIG.
Shows an example in which broadcast information using a multicast address is sent from the monitoring terminal 1-1 to the router R4. Responses are returned from all the terminals C1 and C2 connected to the router R4. -1 detects the IP addresses of the terminals C1 and C2.

The monitoring terminal 1-1 similarly detects and registers all terminals in each network on the LAN by sending out broadcast information using a multicast address to all other routers. Recognize the terminal arrangement in the LAN.

The monitoring terminal 1-1 sends a ping command to each registered terminal to constantly monitor the status of each terminal. Furthermore, the monitoring terminal 1-1 periodically transmits a ping (ping) command to each router and each terminal, collects data on the presence or absence of a response to the ping command for each network group, and calculates a response rate. Then, the state of deterioration of the communication quality of each network is identified.

FIG. 5 shows a display example of a response rate of each network and a totaled result on the monitor terminal screen. The monitoring terminal 1-1 determines a threshold percentage of the response rate as appropriate, and determines and outputs a failure of each network by comparing the threshold percentage with the response rate.

FIG. 6 shows a processing procedure for changing the delivery route according to the response time to the ping command. When there are a plurality of delivery routes from a certain terminal to another certain terminal, a shortest route is detected based on a response time of a ping command, and route control is performed so that data is transferred by the shortest route.

When each router and each terminal have the arrangement shown in FIG. 6A, for example, there are the following two delivery routes from the terminal A1 to the terminal B1. (I) Router R1 → Router R2 → Terminal B1 (ii) Router R3 → Router R4 → Router R6 → Router R
5 → Terminal B1

The above two delivery routes correspond to the monitoring terminal 1-1.
It is grasped by. Therefore, the terminal A1 is the monitoring terminal 1
-1 is requested to confirm the shortest route to the terminal B1 (6-1). The monitoring terminal 1-1 that has received the request transmits the terminal B
1 and searches for the above two routes, and pings (pi) to the terminal B1.
ng) command and send a ping for each route
The response time to the command is measured, and the path with the short response time is detected as the shortest path.

The monitoring terminal 1-1 notifies the shortest path information to the terminal B1 to the terminal A1 (6-2), and the terminal A1 sends the shortest path information to the terminal B1 according to the shortest path information notified from the monitoring terminal 1-1. The delivery route is changed, and thereafter, data is transferred to the terminal B1 via the shortest route (6-3).

[0044]

As described above, according to the present invention,
The monitoring terminal sends a traceroute command, and based on the response information from each router on the delivery route to each terminal, the monitoring terminal detects and registers the router, so that the monitoring terminal can send the router Without inputting address information, the monitoring terminal can collectively grasp information of each router on the LAN.

Also, the above traceroute (traceroute)
A ping command is periodically transmitted from the monitoring terminal to each router in the LAN identified by the above, and a response to the ping command from each router is received. The normality of each router can be monitored, and even if a failure occurs on a router on a plurality of delivery routes, the failure of the router can be found early.

Also, by generating a router arrangement configuration based on response information from each router to the traceroute command and the response order, the LA
The system configuration on N can be created with a small amount of information and displayed on the monitor terminal screen, and the system configuration on the LAN can be grasped collectively by the monitor terminal.

The shortest delivery route is extracted from the plurality of delivery routes based on the arrangement of the routers, and the terminal is notified of the best delivery route, thereby causing the terminal to transfer information via the shortest route. Time can be reduced.

Also, broadcast information is transmitted to all registered routers, and all terminals existing on the local area network are detected based on response information from the terminals to the broadcast information. Thus, all terminals in the LAN can be centrally grasped and managed.

The routers and terminals that have been detected and registered are grouped based on their address information, and the address information is linked to the device names and displayed, so that the names of the routers and terminals are collectively displayed. Registration can be made, and management and operation can be simplified.

Also, by periodically transmitting a ping command to a registered router terminal and summing up the response rate for each network group, not only permanent router failure but also transmission The status of occurrence of a temporary failure in a road or a network is grasped, and it is possible to easily determine quality deterioration for each network group.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a router monitoring procedure according to the present invention.

FIG. 2 is a diagram showing a display example of a system configuration according to the present invention and a database grouped for each network.

FIG. 3 is a diagram showing a procedure for searching for a best delivery route based on a traceroute of the present invention.

FIG. 4 is a diagram showing a procedure for detecting all terminals by sending broadcast information according to the present invention.

FIG. 5 is a diagram showing a display example of a response rate of each network and a totaling result thereof according to the present invention.

FIG. 6 is a diagram showing a procedure for changing a delivery route by a ping command according to the present invention.

[Explanation of symbols]

 1-1 monitoring terminal A1, A2, B1, B2, C1, C2 terminal R1, R2, R3, R4, R5, R6 router

 ──────────────────────────────────────────────────続 き Continuation of the front page F term (reference) 5B089 GB02 HA06 JA35 JB10 KA12 KB03 KC30 5K030 HA08 HD03 HD07 KA05 LB05 MA07 MA12 MA14

Claims (7)

[Claims] 1. A local area network monitoring device installed on a local area network, wherein a terminal on the local area network is set as a destination.
A traceroute command for returning response information from each router on the delivery route is transmitted, and a router existing on the local area network is detected based on response information from each router to the traceroute command. A local area network monitoring device comprising: router detection means; and router registration means for registering router information including address information of the detected router. 2. A router status confirmation means for periodically transmitting a ping command to a router registered in the router registration means and confirming the normality of the router based on the presence or absence of a response. The local area network monitoring device according to claim 1, wherein: 3. The router registering means detects an arrangement order of routers existing on a local area network based on response information from each router to the traceroute command and an order of the responses, and 3. The local area network monitoring device according to claim 1, further comprising means for generating and registering an arrangement configuration. 4. A shortest delivery route is extracted from a plurality of delivery routes based on an arrangement configuration of routers registered in the router registration means, and the shortest delivery route is extracted to a terminal connected to the same router as the local area network monitoring device. 4. The local area network monitoring device according to claim 3, further comprising a best delivery route notification unit for notifying the best delivery route. 5. Broadcast information is transmitted to all routers registered in the router registering means, and based on response information from the terminal to the broadcast information, all broadcast information existing on the local area network is transmitted. The local area according to any one of claims 1 to 4, further comprising: a terminal detecting unit that detects the terminal of the local area; and a terminal registering unit that registers information of the terminal including address information of the detected terminal. Network monitoring device. 6. Grouping information on routers registered in the router registration means and terminals registered in the terminal registration means on the basis of their address information, and linking the address information to a device name. 6. The local area network monitoring device according to claim 5, further comprising: means for displaying the information. 7. A ping command is periodically transmitted to a router registered in the router registration unit and a terminal registered in the terminal registration unit, and each of the routers is determined based on the response. 7. The local area network monitoring according to claim 6, further comprising: means for calculating a response rate of each terminal and totalizing the response rates of each router and each terminal for each group based on the address information. apparatus.