JPH10200526A - Method for managing state of ip node - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for managing a state of an IP node by which a TCP/IP network management system discriminates a state of the IP node, even under the TCP/IP network environment to which an IP address has been assigned dynamically. SOLUTION: A TCP/IP network management system sends a state confirmation request to an IP node (step 100) and confirms the state of the IP node, based on the presence of a response from the IP node (steps 104, 110, 112). The IP node making a response to the state confirmation request is identified by using a MAC address (step 106) to discriminate the identified IP node to be in an operating step (steps 110, 112).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an IP (Inter
The present invention relates to a state management method of a node, and in particular, to a TCP to which an IP address is dynamically assigned.
/ IP (Transmission Control)
Protcol / Internet Protocol
l) TCP / I suitable for application in a network environment
The present invention relates to a state management method of an IP node of a P network management system.

[0002]

2. Description of the Related Art A conventional IP node state management method is disclosed in, for example, Hisao Oogane, "TCP / IP and OSI Network Management", April 1993, Soft.
Research Center, p. 339, the TCP / IP network management system identifies the IP node based on the IP address, and determines the status of the IP node (operation status / (Stop state). Here, the IP address is fixedly assigned to each IP node.

[0003]

However, DHCP (Dynamic Host) which has recently been used has been used.
In the Configuration Protocol, an IP address is assigned when an IP node requests a host. Therefore, the IP address is not fixedly assigned to each IP node, but is dynamically assigned. That is, the IP address assigned to a certain IP node is canceled when the IP node stops, and can be assigned to another IP node that has newly requested the IP address within a short period of time. Therefore, a problem is occurring that the TCP / IP network management system cannot determine the state of the IP node using the IP address.

[0004] Regarding DHCP, for example, IE
TF RFC1541 "Dynamic Host
Configuration Protocol ".

[0005] Since the DHCP host assigns an IP address to an IP node, if the host notifies the TCP / IP network management system of the IP address change information, the TCP / I address is changed.
The P network management system can manage the status of the IP node as in the related art. However, the current DHCP host does not have a change information notification function.

An object of the present invention is to provide an IP node state management method that enables a TCP / IP network management system to determine the state of an IP node even in a TCP / IP network environment where IP addresses are dynamically assigned. It is in.

[0007]

In order to achieve the above object, according to the present invention, a status confirmation request is sent to an IP node, and based on the presence or absence of a response from the IP node, the IP
In the method for managing the status of an IP node by a TCP / IP network management system for confirming the status of the node, the IP address is dynamically assigned to the IP node in a TCP / IP network environment.
The CP / IP network management system identifies, using a MAC address, an IP node that has responded to the status confirmation request, and determines that the identified IP node is in an operating state. According to
Even in a TCP / IP network environment where IP addresses are dynamically assigned, the TCP / IP network management system can determine the state of the IP node.

[0008] In the above-mentioned IP node state management method,
Preferably, the TCP / IP network management system performs the identification of the IP node using the MAC address only when a response from the IP node changes from a state of no response to a state of response. With this method, the load required for the state management processing of the TCP / IP network management system can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for managing the status of an IP node according to an embodiment of the present invention will be described below with reference to FIGS. First, referring to FIG. 1 and FIG. 2, T using the IP node state management method according to an embodiment of the present invention will be described.
The TCP / IP network environment at a certain time point T0 and a certain time point Tn of the CP / IP network will be described.

FIG. 1 is an explanatory diagram showing a TCP / IP network environment at a certain time T0 of a TCP / IP network using an IP node state management method according to an embodiment of the present invention, and FIG. FIG. 2 is an explanatory diagram illustrating a TCP / IP network environment at a certain time Tn of a TCP / IP network using the IP node state management method according to an embodiment;

FIG. 1 shows TCP / I at a certain time T0.
1 shows a P network environment. The TCP / IP network management system 10 is a network 2 such as a LAN.
0 is connected to the router 30. TCP / I
The P network management system 10 has an IP
It has node attribute information 40. Details of the IP node attribute information 40 will be described later with reference to FIG. The router 30 is connected to a plurality of IP nodes 60A and 60B via a network 50 such as a LAN.

At a certain time T0, the IP node 60
A is assigned “I” as an IP address, and MAC (Media Access Co.) is assigned to A.
It is assumed that “M” is assigned as the (control) address. For the IP node 60B,
"J" is assigned as the IP address, and M
It is assumed that “N” is assigned as the AC address.

In the case where IP addresses are dynamically assigned such as DHCP, each IP address is transmitted from each of the IP nodes 60A and 60B to a host (not shown) via the network 50. At this point, an unused free address is allocated arbitrarily.

FIG. 2 shows TCP / I at a certain time Tn.
1 shows a P network environment. The same reference numerals as in FIG.
The same parts are shown. At time T0 shown in FIG. 1, it is assumed that IP node 60A is in the operating state, and then temporarily stops operating. And then again,
When the IP node 60A starts operating, the IP node 60A
A again requests the host for an IP address via the network 50, so that an IP address different from the last time is generally assigned.

That is, at a time point Tn different from the time point T0, “K” is assigned to the IP node 60A as the IP address, and the MAC (Media)
Access Control) address
It is assumed that “M” has been assigned. The MAC address is not changed since it is fixedly assigned to each IP node in advance. Also, I
For the P node 60B, as an IP address,
"I" is assigned, and as the MAC address,
It is assumed that “N” is assigned. That is, the time T
At 0, the IP address “I” assigned to the IP node 60A is assumed to be assigned to the IP node 60B at the time Tn.

As described above, in DHCP or the like, an IP address is dynamically assigned to each IP node. The IP address is, for example, 4
It is represented by byte address data.
On the other hand, the MAC address is
Fixedly assigned. The MAC address is represented by, for example, 6-byte address data.

Next, referring to FIG. 3, TCP / IP using the IP node state management method according to an embodiment of the present invention will be described.
The attribute information of the IP node of the network management system will be described. FIG. 3 is an explanatory diagram of the attribute information of the IP node included in the TCP / IP network management system using the IP node state management method according to one embodiment of the present invention.

FIG. 3A shows the attribute information 40 of the IP node at time T0. The IP node attribute information 40 includes an IP node 42, IP address information 44,
The MAC address information 46 is a table format corresponding to one to one. Here, the correspondence between the IP node 42 and the MAC address information 46 is fixed. That is, the MAC address “M” is fixedly associated with the IP node “A”, and the MAC address “N” is fixedly associated with the IP node “B”.

On the other hand, the IP address 44
2 dynamically. That is, at time T0 shown in FIG. 3A, the IP address “I” corresponds to the IP node “A”, and the IP address “J” corresponds to the IP node “B”. However, this correspondence is dynamic.

FIGS. 3B and 3C respectively show attribute information 40 of the IP node at different times.
These will be described together with the flowchart shown in FIG.

Next, a method for managing the state of an IP node according to an embodiment of the present invention will be described with reference to FIG. FIG. 4 is a flowchart illustrating a processing flow of an IP node state management method according to an embodiment of the present invention.

The flowchart shown in FIG.
It is assumed that the process is executed by the P network management system 10 at a constant cycle. Here, the fixed cycle is, for example, 5 minutes.

In step 100, the TCP / IP network management system 10 sends a status confirmation request to the IP address "I". Here, the time point Ti at which the TCP / IP network management system 10 transmits the request for status confirmation is a time point later than the time point T0 shown in FIG. The TCP / IP network management system 10
IP address "I" assigned to IP node A
A request for a state confirmation is transmitted to the server via the network 20, the router 30, and the network 50 using the attribute information 40 of the IP node.

Next, in step 102, TCP /
The IP network management system 10 checks whether there is a response to the status confirmation request to the IP node. If there is no response, the process proceeds to step 104, and if there is a response, the process proceeds to step 106.

At time Ti, the IP node 6
If 0A is stopped, the process goes to step 104 because the IP node 60A does not respond. In step 104, the TCP / IP network management system 10
Is an IP node "A" having an IP address "I",
It is determined that the state is "stop state".

On the other hand, if it is determined in step 102 that there is a response from the IP node, step 106
Proceed to. In step 106, the TCP / IP network management system 10 checks the MAC address of the IP node 60 that has responded. At time Ti, FIG.
As shown in FIG. 2, the IP node 60A may have responded, and as shown in FIG. 2, the IP node 60B may have responded.
Ask for an address.

The MAC address is determined by the IP node 60
MP (Simple Network Management)
ent Protocol) node, SNMP
It can be obtained directly from the IP node 60 through the request. If the IP node 60 is a non-SNMP node, I
It can be obtained indirectly from the router 30, which is an SNMP node on the same segment as the P node 60. For SNMP, for example, IETF R
FC1157 "A Simple Network
Management Protocol ".

In step 108, the TCP / IP network management system 10 determines whether or not the MAC address obtained in step 106 has been changed. If there is no change, the process proceeds to step 110. If there is a change, the process proceeds to step 112. move on.

Here, the obtained MAC address is
If it is “M”, the TCP / IP network management system 10 uses the attribute information 40 of the IP node shown in FIG. M ”and the obtained MAC address“ M ”are not changed,
Go to 10. In step 110, the TCP / IP network management system 10 transmits the status confirmation request to the IP node "A" for the IP address "I".
It is determined that it is in the “operating state”.

On the other hand, the obtained MAC address is
If it is “N”, the TCP / IP network management system 10 uses the attribute information 40 of the IP node shown in FIG. Since “M” and the obtained MAC address “N” have been changed, the process proceeds to step 112. In step 112, the TCP / I
The P network management system 10 uses the IP node attribute information 40 shown in FIG.
It is determined that the IP node “B” having the C address “N” is in the “operating state”.

Next, at step 114, the TCP /
As shown in FIG. 3B, the IP network management system 10 rewrites the IP address of the IP node “B” in the attribute information 40 of the IP node to “I”, and the attribute information of the IP node “A” is ,delete.

If the obtained MAC address is not included in the attribute information 40 of the IP node, it means that a new IP node is detected. Register during.

Next, at step 116, the TCP /
The IP network management system 10 checks the status of the next IP node “J”.

By repeating the above steps, it is possible to confirm the status of the IP nodes corresponding to all the IP addresses.

Since the TCP / IP network management system 10 can automatically detect the used IP node, for example, a new IP address “K” is assigned to the IP node “A”. And TCP /
The IP network management system 10 detects the assignment of the IP address and, as shown in FIG. 3C, assigns the IP address “A” in the IP node attribute information 40 to the IP node “A”.
Register the P address “K”. This means that
The status of the IP node “A” can be confirmed.

As described above, the TCP / IP network management system 10 issues a status confirmation request at a predetermined cycle to the IP address assigned to the IP node registered in the attribute information of the IP node. Then, by confirming the MAC address of the responding IP node, it is possible to confirm the state of the IP node corresponding to the MAC address even if the IP address is dynamically assigned. Become.

As described above, according to the present embodiment, the TCP / IP network management system can determine the state of an IP node even in a TCP / IP network environment where IP addresses are dynamically assigned. It becomes possible.

Next, a method for managing the state of an IP node according to another embodiment of the present invention will be described with reference to FIG.
FIG. 5 is a flowchart illustrating a processing flow of an IP node state management method according to another embodiment of the present invention. Note that the TCP / IP network environment is as shown in FIGS. 1 and 2, and the attribute information 40 of the IP node has a configuration as shown in FIG.

The flowchart shown in FIG.
It is assumed that the process is executed by the P network management system 10 at a constant cycle. Here, the fixed cycle is, for example, 5 minutes.

In this embodiment, step 105 is added between steps 102 and 106 of the method described with reference to FIG.

In step 100, the TCP / IP network management system 10 transmits a status confirmation request to the IP address "I". Here, the time point Ti at which the TCP / IP network management system 10 transmits the request for status confirmation is a time point later than the time point T0 shown in FIG. The TCP / IP network management system 10
IP address "I" assigned to IP node A
A request for a state confirmation is transmitted to the server via the network 20, the router 30, and the network 50 using the attribute information 40 of the IP node.

Next, in step 102, TCP /
The IP network management system 10 checks whether there is a response to the status confirmation request to the IP node. If there is no response, the process proceeds to step 104, and if there is a response, the process proceeds to step 106.

Here, at time Ti, the IP node 6
If 0A is stopped, the process goes to step 104 because the IP node 60A does not respond. In step 104, the TCP / IP network management system 10
Is an IP node "A" having an IP address "I",
It is determined that the state is "stop state".

On the other hand, if it is determined in step 102 that there is a response from the IP node, step 105
Proceed to. In step 105, the TCP / IP network management system 10 determines whether the request addressed to the IP address “I” has changed from no response to a response.
If it has not changed, the process proceeds to step 110, and if it has changed, the process proceeds to step 106. That is, the time Ti
Is compared with the response situation at the previous time point Ti-1. If there is a response at time Ti-1 and there is also a response at time Ti,
Assuming that it has not changed, the process proceeds to step 110. Also, there is no response at time Ti-1 and at time Ti-1
If there is a response in, it is determined that the response has changed, and the process proceeds to step 106.

If there is no change, in step 110, the TCP / IP network management system 10
I for the IP address "I" that sent the status confirmation request
The P node “A” determines that it is in the “operating state”.

On the other hand, when there is a change from no response to a response, the one that was not operating at the previous time point Ti-1 is newly operating, so the IP address “I” is Since it is highly likely that the IP node “A” that has transmitted the status confirmation request has been assigned to another IP node, the process proceeds to step 106. That is, in the present embodiment, the steps after step 106 are executed only when there is a high possibility that the IP node to which the predetermined IP address is assigned has changed.

In step 106, the TCP / IP network management system 10
Check the MAC address of 0. At time Ti,
As shown in FIG. 1, the same IP address “I” is again assigned to the IP node 60A to which the IP address “I” has been assigned, and the IP node 60A responds. As shown in FIG.
Since the P node 60B may have responded,
Find the MAC address of the P node.

As for the MAC address, the IP node 60
MP (Simple Network Management)
ent Protocol) node, SNMP
It can be obtained directly from the IP node 60 through the request. If the IP node 60 is a non-SNMP node, I
It can be obtained indirectly from the router 30, which is an SNMP node on the same segment as the P node 60. For SNMP, for example, IETF R
FC1157 "A Simple Network
Management Protocol ".

In step 108, the TCP / IP network management system 10 determines whether or not the MAC address obtained in step 106 has been changed. If there is no change, the process proceeds to step 110. If there is, the process proceeds to step 112. move on.

Here, the obtained MAC address is
If it is “M”, the TCP / IP network management system 10 uses the attribute information 40 of the IP node shown in FIG. M ”and the obtained MAC address“ M ”are not changed,
Go to 10. In step 110, the TCP / IP network management system 10 transmits the status confirmation request to the IP node "A" for the IP address "I".
It is determined that it is in the “operating state”.

On the other hand, the obtained MAC address is
If it is “N”, the TCP / IP network management system 10 uses the attribute information 40 of the IP node shown in FIG. Since “M” and the obtained MAC address “N” have been changed, the process proceeds to step 112. In step 112, the TCP / I
The P network management system 10 uses the IP node attribute information 40 shown in FIG.
It is determined that the IP node “B” having the C address “N” is in the “operating state”.

Next, at step 114, the TCP /
As shown in FIG. 3B, the IP network management system 10 rewrites the IP address of the IP node “B” in the attribute information 40 of the IP node to “I”, and the attribute information of the IP node “A” is ,delete.

When the obtained MAC address is not included in the attribute information 40 of the IP node, it means that a new IP node is detected. Therefore, the MAC address and the value of the IP address are replaced with the value of the attribute information 40 of the IP node. Register during.

Next, at step 116, the TCP /
The IP network management system 10 checks the status of the next IP node “J”.

By repeating the above steps, the status of the IP nodes corresponding to all the IP addresses can be confirmed.

Since the TCP / IP network management system 10 can automatically detect the used IP node, for example, a new IP address “K” is assigned to the IP node “A”. And TCP /
The IP network management system 10 detects the assignment of the IP address and, as shown in FIG. 3C, assigns the IP address “A” in the IP node attribute information 40 to the IP node “A”.
Register the P address “K”. This means that
The status of the IP node “A” can be confirmed.

As described above, the TCP / IP network management system 10 sends a status confirmation request at a predetermined cycle to the IP address assigned to the IP node registered in the attribute information of the IP node. For the responding IP node, by confirming the MAC address based on the change of the response, even if the IP address is dynamically assigned, the state of the IP node corresponding to the MAC address is changed. It is possible to confirm.

Since step 106 and subsequent steps are executed only when there is a change in the response, the TCP /
This reduces the load required for the status confirmation processing of the IP network management system 10.

As described above, according to the present embodiment, the TCP / IP network management system can determine the state of an IP node even in a TCP / IP network environment where IP addresses are dynamically assigned. It becomes possible.

[0060]

According to the present invention, the TCP / IP network management system can be used in a TCP / IP network environment where IP addresses are dynamically assigned.
It is possible to determine the state of the node.

[Brief description of the drawings]

FIG. 1 is a timing T of a TCP / IP network using an IP node state management method according to an embodiment of the present invention;
FIG. 2 is an explanatory diagram showing a TCP / IP network environment at 0.

FIG. 2 is a timing T of a TCP / IP network using the IP node state management method according to an embodiment of the present invention;
3 is an explanatory diagram showing a TCP / IP network environment in n.

FIG. 3 is an explanatory diagram of attribute information of an IP node included in a TCP / IP network management system using an IP node state management method according to an embodiment of the present invention.

FIG. 4 is a flowchart illustrating a processing flow of an IP node state management method according to an embodiment of the present invention.

FIG. 5 is a flowchart illustrating a processing flow of an IP node state management method according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... TCP / IP network management system 20, 40 ... Network 30 ... Router 40 ... Attribute information of IP node 60A, 60B ... IP node

Claims (2)

[Claims] 1. A status confirmation request is sent to an IP node, and based on the presence or absence of a response from the IP node, an IP
In a state management method of an IP node by a TCP / IP network management system for confirming a state of a node, the TCP / IP network environment in which the IP address is dynamically assigned to the IP node, A network management system, comprising: identifying an IP node responding to the status confirmation request by using a MAC address; and determining that the identified IP node is in an operating state. 2. The method according to claim 1, wherein said TCP / IP network management system comprises:
A method for managing the status of an IP node, comprising: identifying an IP node using an AC address only when a response from the IP node changes from a non-response state to a response-present state.