JP3952786B2 - COMMUNICATION SYSTEM AND METHOD FOR DETECTING NEW PARTICIPATION DEVICE USED FOR THE SAME - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a communication system and a newly-joined communication device detection method used therefor, and more particularly to a method for detecting a communication device newly participating in a network.
[0002]
[Prior art]
Conventionally, in a network, when a communication device that performs communication for the first time is connected to the network, information for communication with the communication device is not set at all.
[0003]
Therefore, before starting actual communication, various information for communication is not only transmitted to communication devices newly participating in the network, but also to communication devices that manage configuration information etc. of existing networks. Must be set.
[0004]
[Problems to be solved by the invention]
In the above-described conventional network, setting the information necessary for communication in each apparatus requires a very troublesome work, and it is required to automatically perform such a work. Actually, automatic setting of such information is not easy, and the current situation is that manual setting is performed.
[0005]
In addition, there is a demand for making the setting efficiently and immediately when a newly participating communication device is connected to the network. However, at present, it is not easy to immediately detect that a new communication device has joined the network.
[0006]
In addition, it is necessary to avoid additionally installing a new function for realizing such information setting automatically in a communication apparatus newly joining the network.
[0007]
New communication devices that join the network are devices with various implementations, and it is difficult to create new functions according to these implementations and to add them to those devices. The administrator of the device will not easily permit the addition of new functions, and even if it is permitted, the effort will be very large. That is, in order to realize this function, it is expected that the communication apparatus newly joining the network can be performed without adding any function.
[0008]
Accordingly, an object of the present invention is to solve the above-described problems, and to use a communication system that can immediately detect when the communication apparatus is connected without adding a function to the newly participating communication apparatus. It is an object of the present invention to provide a new participation communication device detection method.
[0009]
[Means for Solving the Problems]
The communication system according to the present invention is a communication system for sending an address duplication detection packet for verifying whether an address to be used exists on the network when the communication device is newly connected to the network,
A packet monitoring apparatus comprising: monitoring means for monitoring packets on the network; and detection means for detecting the address duplication detection packet among packets monitored by the monitoring means ;
In the packet monitoring device, when the detection unit does not detect a response packet indicating duplication of the address for the packet within a predetermined time after the packet for address duplication detection is transmitted, Detecting that a new communication device is connected to the network .
[0010]
The communication device detection method for new participation according to the present invention is a communication for transmitting an address duplication detection packet for verifying whether an address to be used exists on the network when the communication device is newly connected to the network. A newly-joined communication device detection method in a system,
Packet monitoring unit for monitoring a packet on the network, performs the steps of detecting a packet for the address overlap detection from the packets the monitoring,
When the packet monitoring device does not detect a response packet indicating the address duplication for the packet within a predetermined time after the packet for address duplication detection is transmitted, a new communication is made to the network. Detecting that the device is connected .
[0011]
In other words, the network of the present invention can be newly added to the network without adding a function to the communication device itself in a communication environment in which communication devices having various implementations dynamically participate in the network. A system for immediately detecting the occurrence of the failure is provided.
[0012]
The first procedure for a communication device that newly joins the network to start communication is to create an address, confirm that the created address is not duplicated on the network, and then set it on its own device. It is to be. In this address setting procedure, a packet for confirming (detecting) duplication on the network of the address created by the own device from the newly joined communication device to the network (hereinafter referred to as address duplication detection) Packet).
[0013]
Therefore, a packet monitoring device for monitoring the address duplication detection packet is installed on the network in advance, and the address duplication detection packet sent from the communication device newly joined to the network and a predetermined time. When the packet monitoring device detects the presence / absence of a response packet to the packet, it is possible to immediately detect that a new communication device has joined the network.
[0014]
The address duplication detection packet to be detected is sent out in the procedure that is first performed by the communication device newly joined to the network to start communication. Detection of participation will be performed immediately.
[0015]
An address duplication detection packet is generated only once when communication is started for the first time after the communication apparatus is connected to the network. Although this is different from the original purpose, this packet has characteristics suitable for the purpose of detecting a communication device newly joined to the network, and newly joined to the network by monitoring this address duplication detection packet. The method for detecting the communication device is an optimal system that is not excessive or insufficient as a system.
[0016]
In addition, after detecting that a communication device has joined the network, it is necessary to set the address information of the detected communication device in various devices to prepare a communication environment, and a new communication device joins the network. It is necessary to acquire the address information of the detected communication device as well as to detect that the communication device newly joined the network for the address duplication detection packet detected by the packet monitoring device. The address information of the detected communication device can be acquired at the same time.
[0017]
As described above, the present invention introduces a packet monitoring device, detects a packet for address duplication detection issued in the address setting procedure that is first performed by a communication device newly participating in the network, By detecting the presence or absence of a response packet for the packet within the time, it is immediately detected that the communication device newly joined the network without adding a function to the communication device newly joining the network. It becomes possible to do.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a communication system according to an embodiment of the present invention. 1, a communication system according to an embodiment of the present invention includes an existing communication device group 1 that manages configuration information and the like of a network 100, a communication device 2 that newly participates in the network 100, and a communication device group 1. And a packet monitoring device 3 that monitors packets sent from the communication device 2 to the network 100 and detects a target packet, and a network 100 that connects these devices.
[0019]
The existing communication device group 1 has a configuration of the network 100 used for assisting in address setting of the information management device 11 that stores and updates information for communication and the communication device 2 that newly participates in the network 100. And a notification device 12 for notifying information. The communication device 2 newly participating in the network 100 includes an address setting unit 21 that realizes address setting.
[0020]
The packet monitoring device 3 includes a packet monitoring unit 31 that monitors a packet flowing through the connected network 100, and a packet detection unit 32 that detects a target packet from the monitored packets.
[0021]
FIG. 2 is a sequence chart showing an operation when address setting is successful in the communication system according to the embodiment of the present invention. With reference to these FIG. 1 and FIG. 2, the operation at the time of successful address setting of the communication apparatus 2 newly participating in the network 100 in the communication system according to an embodiment of the present invention will be described.
[0022]
First, in order to perform communication, the communication apparatus 2 is connected to the network 100 by performing processing such as physically connecting a cable (not shown) or turning on the apparatus (step S1 in FIG. 2). ).
[0023]
Next, as a procedure that the communication device 2 performs first, an address setting unit 21 performs address setting (steps S2 to S7 in FIG. 2). A method for automatically performing this address setting is published as RFC (Request For Comments) 2462 by the IETF (Internet Engineering Task Force).
[0024]
In the address setting procedure, the communication device 2 receives a packet issued from the notification device 12 in the existing communication device group 1 that manages the configuration information and the like of the network 100 and notifies the configuration information of the network 100. Is performed (steps S3 and S4 in FIG. 2).
[0025]
Since the packet for notifying the configuration information is flowed on the network 100 at regular intervals, the communication device 2 can receive the packet for notifying the configuration information when waiting for the regular interval.
[0026]
When it is desired to receive a packet for notifying the configuration information without waiting for the time, as an optional method, the communication device 2 can issue a packet for requesting immediate issuance of the packet for notifying the configuration information. Then, the notification device 12 can issue a packet for notifying the configuration information of the network 100, and the communication device 2 can receive the packet for notifying the configuration information (steps S2 to S4 in FIG. 2).
[0027]
Information obtained from the packet for notifying the received configuration information (identification information for identifying the network 100, etc.) is combined with the identification information of the communication device 2 and becomes a candidate for an address used by the communication device 2 (step in FIG. 2). S3, S4).
[0028]
It is confirmed that this candidate address is not a duplicate address that is already used by another communication apparatus. As this method, “neighbor search” published as RFC 2461 by IETF is used. First, a packet for confirming that the address is not a duplicate address used by another communication apparatus (hereinafter referred to as an address duplication detection packet) is issued from the communication apparatus 2 to the network 100 by multicast. Is done. This address duplication detection packet includes candidate address information (step S5 in FIG. 2).
[0029]
If another communication apparatus already connected to the network 100 has already used the candidate address, the address duplication detection packet is received when the other communication apparatus receives a packet for address duplication detection. In response to the detection packet, a response packet indicating that the candidate address is already used and duplicated and cannot be used by the communication device 2 is sent out by multicast (steps S5 and S6 in FIG. 2). ).
[0030]
In the case where the candidate addresses are duplicated as described above, a response packet indicating duplication is sent within a certain time after the address duplication detection packet for verifying that the candidate address can be used is sent. Always sent out.
[0031]
When the candidate addresses are not duplicated, a response packet indicating duplication is not sent to the network 100. Therefore, after confirming that the candidate address is available, after confirming that the address duplication detection packet is sent, even if it waits for a certain time, no response packet indicating duplication is sent at all. The candidate address is an address that can be used by the communication device 2 (steps S5 and S6 in FIG. 2).
[0032]
Whether the packet monitoring device 3 flows to the connected network 100 and an address duplication detection packet for verifying whether candidate addresses are duplicated or a response packet indicating duplication does not flow within a predetermined time. Is monitoring.
[0033]
By monitoring these packets, the packet monitoring device 3 can grasp a series of address setting procedures and the state of the communication device 2 without adding a new function to the communication device 2.
[0034]
If the packet monitoring device 3 cannot detect a response packet indicating duplication after waiting for a certain time after detecting a packet for address duplication detection for verifying whether a candidate address is duplicated, the packet monitoring device 3 can confirm that the address setting of the communication device 2 has been performed correctly, and at the same time, detects that a new communication device 2 has joined the network 100 (step S7 in FIG. 2).
[0035]
The packet for address duplication detection for verifying whether the candidate address is duplicated includes information on the candidate address. By this detection processing, the packet monitoring device 3 adds a new communication device 2 to the network 100. In addition to detecting participation, address information used by the new communication device 2 can be acquired.
[0036]
It is possible to check whether the address information acquired in the packet monitoring device 3 belongs to a valid address space. When the acquired address information is information belonging to an unauthorized address space, it can be processed as if it was not detected that a new communication device 2 joined the network 100.
[0037]
As described above, in this embodiment, the packet monitoring device 3 monitors the address duplication detection packet and the response packet indicating the duplication corresponding to the first procedure performed by the communication device 2 newly participating in the network 100. By detecting that the new communication device 2 has joined the network 100, the new communication device 2 connected to the network 100 can be immediately detected when the communication device 2 connects to the network 100. .
[0038]
In the present embodiment, the address duplication detection packet generated in accordance with the procedure performed for the communication apparatus 2 newly participating in the network 100 to start communication and the response packet indicating the duplication to the packet are communicated. By monitoring using the packet monitoring device 3 outside the device 2, it is possible to detect that the communication device 2 has newly joined the network 100, so that the communication device 2 newly joining the network 100 can be detected. It is possible to detect that the communication apparatus 2 has newly joined the network 100 without adding a function to the communication apparatus 2 itself.
[0039]
Furthermore, in this embodiment, the communication device 2 that newly participates in the network 100 monitored by using the packet monitoring device 3 transmits the packet to the address duplication detection packet generated in accordance with the procedure performed for starting communication. Since the address information used by the device 2 is included, it is possible not only to detect that a new communication device 2 has joined the network 100 but also to simultaneously acquire the address information used by the communication device 2. .
[0040]
Furthermore, in the present embodiment, the communication device 2 newly participating in the network 100 generates an address duplication detection packet associated with a procedure that is first performed once when communication is started and a response packet indicating duplication for the packet. By monitoring with the packet monitoring device 3, a new communication device 2 connected to the network 100 can be detected.
[0041]
At this time, in this embodiment, the address duplication detection packet generated in accordance with the procedure performed for the communication device 2 newly participating in the network 100 to be monitored using the packet monitoring device 3 to start communication, Since address information used by the new communication device 2 is included and it is possible to verify whether the address information belongs to an illegal address space, communication is performed by setting an address in an invalid address space. In the case of the communication device 2 that starts the communication, it can be processed as if it was not detected that a new communication device 2 joined the network 100.
[0042]
FIG. 3 is a sequence chart showing the operation when address setting fails in the communication system according to the embodiment of the present invention. 1 and 3, in the communication system according to the embodiment of the present invention, the operation when the address setting of the communication device 2 newly participating in the network 100 fails, that is, the newly added communication device 2 is generated. The operation when the address already exists on the network 100 and is duplicated will be described.
[0043]
First, in order to perform communication, processing such as physically connecting a cable or the like or turning on the power of the apparatus is performed, and the communication apparatus 2 newly participating in the network 100 is connected to the network 100.
[0044]
Next, the address setting unit 21 performs address setting as the procedure that the communication device 2 performs first. The address setting procedure is performed by receiving in the communication device 2 a packet issued from the notification device 12 in the existing communication device group 1 and notifying the configuration information of the network 100.
[0045]
Since the packet for notifying the configuration information is sent over the network 100 at regular intervals, the communication device 2 can receive the packet for notifying the configuration information when waiting for the regular interval.
[0046]
When it is desired to receive a packet for notifying the configuration information without waiting for the time, as an optional method, the communication device 2 can issue a packet for requesting immediate issuance of the packet for notifying the configuration information. Then, the notification device 12 can issue a packet for notifying the configuration information of the network 100, and the communication device 2 can receive the packet for notifying the configuration information.
[0047]
Information obtained from the packet that notifies the received configuration information (identification information that identifies the network 100, etc.) is combined with the identification information that the communication device 2 has, and becomes a candidate for an address that the communication device 2 uses.
[0048]
The address duplication detection packet for verifying that the candidate address is not a duplicate address that is already used by another communication device and verifying that it is an available address is 2 to the network 100 by multicast. The address duplication detection packet for this verification includes candidate address information.
[0049]
If another communication device already connected to the network has already used this candidate address, the address duplication detection is performed when the packet for address duplication detection is received by the other communication device. A response packet indicating that the candidate address is already used and duplicated and cannot be used by the communication device 2 is sent out by multicast (step S8 in FIG. 3).
[0050]
In the case where the candidate addresses are duplicated as described above, a response packet indicating duplication is sent within a certain time after the address duplication detection packet for verifying that the candidate address can be used is sent. Always sent out.
[0051]
When the packet monitoring device 3 receives a response packet indicating duplication within a certain time, it is detected that the newly added communication device 2 cannot be registered using the address (step S9 in FIG. 3). , S10).
[0052]
FIG. 4 is a sequence chart showing the operation of the communication system according to another embodiment of the present invention. A communication system according to another embodiment of the present invention has the same configuration as that of the communication system according to one embodiment of the present invention shown in FIG. In this embodiment, a case will be described in which an IP (Internet Protocol) address is not desired to be used for a newly added communication device 2 for some reason in one embodiment of the present invention.
[0053]
In this case, the configuration of each apparatus is the same as that of the embodiment of the present invention, but the packet monitoring apparatus 3 includes a packet transmission unit 33 (not shown) for intentionally transmitting a packet indicating address duplication.
[0054]
First, in order to perform communication, processing such as physically connecting a cable or the like or turning on the power of the apparatus is performed, and the communication apparatus 2 newly participating in the network 100 is connected to the network 100.
[0055]
Next, the address setting is performed by the address acquisition setting unit 21 in the communication device 2 as a procedure that the communication device 2 performs first. This address setting procedure is the same as that in the embodiment of the present invention described above. Information obtained from the packet that notifies the received configuration information (identification information that identifies the network 100, etc.) is combined with the identification information that the communication device 2 has, and becomes a candidate for an address that the communication device 2 uses.
[0056]
The address duplication detection packet for verifying that the candidate address is not a duplicate address that is already used by another communication device and verifying that it is an available address is 2 to the network 100 by multicast. The address duplication detection packet for this verification includes candidate address information.
[0057]
If the administrator of the network 100 does not want to use the address issued from the communication device 2 for some reason, the candidate address can be used as in the case where the candidate address is duplicated. After receiving a packet for address duplication detection for verifying this, a packet indicating duplication is sent out from the packet transmission unit 33 within a predetermined time (steps S11 and S12 in FIG. 4). By transmitting a packet indicating duplication, the communication device 2 recognizes that the candidate address is duplicated (step S13 in FIG. 4).
[0058]
For this reason, the communication device 2 cannot use the candidate address, selects another candidate address again, and again performs the above-described duplicate detection for the new candidate address. Note that the packet monitoring device 3 can perform processing so as not to detect that a new communication device 2 has joined the network 100 by sending a packet indicating duplication.
[0059]
【The invention's effect】
As described above, according to the present invention, in a communication system in which a communication device sends out a packet for address duplication detection when a new connection is made to a network, the packet monitoring device that monitors a packet on the network uses an address from the monitored packet. By detecting the packet for duplication detection, it is possible to immediately detect when the communication device is connected without adding a function to the newly participating communication device itself.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a communication system according to an embodiment of the present invention.
FIG. 2 is a sequence chart showing an operation when address setting is successful in the communication system according to the embodiment of the present invention.
FIG. 3 is a sequence chart illustrating an operation when address setting fails in the communication system according to the embodiment of the present invention.
FIG. 4 is a sequence chart showing an operation of a communication system according to another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Existing communication apparatus group 2 Communication apparatus newly participating in network 3 Packet monitoring apparatus 11 Information management apparatus 12 Notification apparatus 21 Address setting part 31 Packet monitoring part 32 Packet detection part 100 Network

Claims (8)

A communication system for multicasting a packet for address duplication detection for verifying whether an address to be used exists on the network when the communication device is newly connected to the network,
A packet monitoring device comprising: monitoring means for monitoring packets on the network; and detection means for detecting the address duplication detection packet among packets monitored by the monitoring means;
In the packet monitoring device, when the detection unit does not detect a response packet indicating duplication of the address for the packet within a predetermined time after the packet for address duplication detection is transmitted, A communication system that detects that a new communication device is connected to a network.   The packet monitoring device performs processing so as not to detect that a new communication device is connected to the network in the case of a communication device that starts communication by setting an address in an invalid address space. The communication system according to claim 1.   The communication system according to claim 1 or 2, wherein the address duplication detection packet includes address information used by a communication apparatus newly participating in the network. Means for sending a packet indicating address duplication when the address information indicates a preset address in the packet monitoring device;
4. The communication system according to claim 3, wherein the packet monitoring apparatus performs processing so as not to detect that a new communication apparatus is connected to the network by transmitting a packet indicating the address duplication. . A newly joined communication device detection method in a communication system in which a packet for address duplication detection for verifying whether or not an address to be used exists on the network when the communication device is newly connected to the network is multicast. There,
A packet monitoring device that monitors the packet on the network performs a step of detecting the address duplication detection packet from the monitored packet;
When the packet monitoring device does not detect a response packet indicating the address duplication for the packet within a predetermined time after the packet for address duplication detection is transmitted, a new communication is made to the network. A method for detecting a newly joined communication device, characterized by detecting that a device is connected.   The packet monitoring device performs processing so as not to detect that a new communication device is connected to the network in the case of a communication device that starts communication by setting an address in an invalid address space. The method of detecting a newly participating communication device according to claim 5.   7. The newly joining communication device detection method according to claim 5, wherein the address duplication detection packet includes address information used by the newly connected communication device.   The packet monitoring apparatus executes a step of transmitting a packet indicating address duplication when the address information indicates a preset address, and transmits a packet indicating the address duplication so that a new communication apparatus is added to the network. 8. The method for detecting a newly joined communication device according to claim 7, wherein processing is performed so that the connection is not detected.

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