WO2016139937A1 - 情報処理システム、代理サーバ、アドレス重複防止方法及びコンピュータ読み取り可能記録媒体 - Google Patents
情報処理システム、代理サーバ、アドレス重複防止方法及びコンピュータ読み取り可能記録媒体 Download PDFInfo
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- WO2016139937A1 WO2016139937A1 PCT/JP2016/001117 JP2016001117W WO2016139937A1 WO 2016139937 A1 WO2016139937 A1 WO 2016139937A1 JP 2016001117 W JP2016001117 W JP 2016001117W WO 2016139937 A1 WO2016139937 A1 WO 2016139937A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/50—Address allocation
- H04L61/5007—Internet protocol [IP] addresses
- H04L61/5014—Internet protocol [IP] addresses using dynamic host configuration protocol [DHCP] or bootstrap protocol [BOOTP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/09—Mapping addresses
- H04L61/10—Mapping addresses of different types
- H04L61/103—Mapping addresses of different types across network layers, e.g. resolution of network layer into physical layer addresses or address resolution protocol [ARP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/09—Mapping addresses
- H04L61/10—Mapping addresses of different types
- H04L61/106—Mapping addresses of different types across networks, e.g. mapping telephone numbers to data network addresses
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/09—Mapping addresses
- H04L61/25—Mapping addresses of the same type
- H04L61/2503—Translation of Internet protocol [IP] addresses
- H04L61/2521—Translation architectures other than single NAT servers
- H04L61/2528—Translation at a proxy
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/50—Address allocation
- H04L61/5046—Resolving address allocation conflicts; Testing of addresses
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/50—Address allocation
- H04L61/5092—Address allocation by self-assignment, e.g. picking addresses at random and testing if they are already in use
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/59—Network arrangements, protocols or services for addressing or naming using proxies for addressing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L2101/00—Indexing scheme associated with group H04L61/00
- H04L2101/60—Types of network addresses
- H04L2101/618—Details of network addresses
- H04L2101/622—Layer-2 addresses, e.g. medium access control [MAC] addresses
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L2101/00—Indexing scheme associated with group H04L61/00
- H04L2101/60—Types of network addresses
- H04L2101/668—Internet protocol [IP] address subnets
Definitions
- the present invention relates to an information processing system that dynamically assigns an IP (Internet Protocol) address in response to a request from a terminal, a proxy server, an address duplication prevention method, and a program for causing a computer to execute the method.
- IP Internet Protocol
- IP address management is performed by using a DHCP (Dynamic Host Configuration Configuration Protocol) and dynamically assigning an IP address by the server.
- DHCP Dynamic Host Configuration Configuration Protocol
- Non-Patent Document 1 A method of dynamically assigning an IP address is described in “3.1 Client-server interaction-address assignment” of RFC 2131 (referred to as Non-Patent Document 1) formulated by IETF (Internet Engineering Task Force). . The method will be briefly described.
- the DHCP server transmits an ICMP (Internet Control Message Protocol) echo request addressed to the IP address to be allocated in order to check whether the IP address allocated to the client terminal is already used. Then, the DHCP server determines whether or not the designated IP address is used depending on whether or not there is an ICMP echo response from any of the client terminals.
- ICMP Internet Control Message Protocol
- the DHCP server uses ICMP to check the use status of the IP address, and by not assigning an already used IP address, the same IP address is duplicated to a plurality of client terminals. To prevent assignment.
- IPv6 Internet Protocol Version 6
- RFC 3315 referred to as Non-Patent Document 2.
- Patent Document 1 discloses a method in which a single DHCP server manages an IP address by providing a DHCP relay agent between subnets in a network in which a plurality of subnets are connected via a router.
- Patent Document 2 discloses that a plurality of DHCP servers are provided in a network in order to increase the reliability when assigning IP addresses.
- the network between the DHCP server and the client terminal does not have IP reachability, that is, predetermined communication via the network cannot be performed.
- the ICMP echo request does not reach the client terminal from the DHCP server.
- communication by ICMP may be blocked by a firewall set in a communication device such as a router that relays communication between a subnet to which a DHCP server is connected and a subnet to which a client terminal is connected.
- the DHCP server cannot check the usage status of the IP address. In this case, the DHCP server cannot check the presence / absence of duplicate assignment of IP addresses. Then, the DHCP server may assign the same IP address to a plurality of client terminals in the same subnet.
- the present invention has been made to solve the above-described problems of the technology, and an information processing system, a proxy server, an address duplication prevention method, and a method for preventing duplication of IP address assignment in a computer.
- the main purpose is to provide a program for execution.
- an information processing system When there is a request for address allocation from the client terminal, a request message requesting confirmation of the usage status of the target address is transmitted to a second subnet different from the first subnet to which the own device is connected, and the request A DHCP server that receives a response message including a confirmation result for the message from the second subnet and determines whether to assign an address to the client terminal based on the confirmation result; When a request message is received from the DHCP server connected to the second subnet, an echo request for requesting a reply to the client terminal that uses the target address is sent to the subnet to which the client terminal that requested the address assignment is connected. A proxy server that sends a response message to the DHCP server including a response result indicating whether or not there is a response to the echo request; Have
- the proxy server in one embodiment of the present invention, Upon receipt of the address assignment request from the client terminal, the usage status of the target address is confirmed from the DHCP server connected to the first subnet via the second subnet different from the first subnet.
- Use confirmation processing means for receiving a request message to request and returning a response message including a confirmation result for the request message to the DHCP server;
- the usage confirmation processing unit receives the request message from the DHCP server, it sends an echo request for requesting a reply to the client terminal using the targeted address to the subnet to which the client terminal that requested the address assignment is connected.
- Exploration processing means for notifying the use confirmation processing unit as a confirmation result of the presence or absence of a response to the echo request; Have
- An address duplication prevention method is an address duplication prevention method by a proxy server connected to a subnet different from the DHCP server, When a request message requesting confirmation of the usage status of the target address is received from the DHCP server that has received a request for address allocation from the client terminal, a response is requested to the client terminal using the target address. Send an echo request to the subnet to which the client terminal that requested the address assignment is connected, Generate a response message that includes the presence or absence of a response to the echo request as a confirmation result for the request message, The generated response message is returned to the DHCP server.
- the computer-readable recording medium is provided in a computer connected to a different subnet from the DHCP server.
- a request message requesting confirmation of the usage status of the target address is received from the DHCP server that has received a request for address allocation from the client terminal, a response is requested to the client terminal using the target address.
- a program for executing a procedure for returning the generated response message to the DHCP server is stored temporarily.
- the DHCP server it is possible for the DHCP server to check whether or not the IP address is used even if the route through which the DHCP server and the client terminal communicate by DHCP is a network without IP reachability. It is possible to prevent duplicating addresses.
- each component of each system indicates a functional unit block. Part or all of each component of each system is realized by an arbitrary combination of a computer 500 and a program as shown in FIG. 8, for example.
- the computer 500 includes the following configuration as an example.
- CPU Central Processing Unit
- ROM Read Only Memory
- RAM Random Access Memory
- a program 504 loaded into the RAM 503
- a storage device 505 for storing the program 504
- a drive device 507 for reading / writing the recording medium 506
- Communication interface 508 connected to the communication network 509
- An input / output interface 510 for inputting / outputting data -Bus 511 connecting each component
- Each component of each device in each embodiment is realized by the CPU 501 acquiring and executing a program 504 that realizes these functions.
- the program 504 that realizes the function of each component of each device is stored in advance in the storage device 505 or the RAM 503, for example, and is read by the CPU 501 as necessary.
- the program 504 may be supplied to the CPU 501 via the communication network 509 or may be stored in the recording medium 506 in advance, and the drive device 507 may read the program and supply it to the CPU 501.
- each device may be realized by an arbitrary combination of the information processing device 500 and a program that are separately provided for each component.
- a plurality of constituent elements included in each device may be realized by an arbitrary combination of one information processing device 500 and a program.
- each device is realized by a general-purpose or dedicated circuit, a processor, or a combination thereof. These may be constituted by a single chip cage or may be constituted by a plurality of chip cages connected via a bus. Part or all of each component of each device may be realized by a combination of the above-described circuit and the like and a program.
- FIG. 1 is a block diagram illustrating a configuration example of a network including an information processing system according to the present embodiment.
- the network shown in FIG. 1 has a configuration having subnets 50A to 50D.
- the subnet 50A is connected to the subnet 50B via the router 41, and is connected to the subnet 50D via the router 43.
- the subnet 50D is connected to the subnet 50C via the router 42.
- the DHCP server 10 is connected to the subnet 50B.
- the DHCP proxy server 20 is connected to the subnet 50C.
- the information processing system of this embodiment includes a DHCP server 10 and a DHCP proxy server 20.
- the DHCP server 10 is connected to the subnet 50A via the subnet 50B and the router 41, and is connected to the subnet 50C via the router 42.
- DHCP client terminals hereinafter simply referred to as “client terminals” 31, 32 are connected to the subnet 50A.
- the DHCP server 10 is a server that distributes network setting information to the client terminals 31 and 32.
- the client terminals 31 and 32 are terminals that request network setting information from the DHCP server 10 using DHCP and acquire the network setting information from the DHCP server 10.
- the network setting information includes a subnet mask in addition to the IP address.
- the IP address includes a network address that is different for each subnet and a host address that is different for each terminal.
- the DHCP proxy server 20 receives a request for confirming the IP address usage status from the DHCP server 10 and confirms whether or not the IP address to be confirmed is being used instead of the DHCP server 10.
- Routers 41-43 relay communications between subnets.
- the router 41 has a DHCP relay agent function in addition to a general router function. Therefore, an IP address assignment request and an assignment to the request are performed via the router 41.
- FIG. 2 is a functional block diagram showing a configuration example of the DHCP server shown in FIG.
- the DHCP server 10 includes an information processing unit 11 and a storage unit 15.
- the DHCP server 10 is realized by the computer 500 or the like described above. That is, the information processing unit 11 includes a memory (not shown) that stores a program, and a CPU (Central Processing Unit) (not shown) that executes processing according to the program.
- a memory not shown
- CPU Central Processing Unit
- the storage unit 15 includes a DHCP related information storage unit 16 and a proxy address storage unit 17.
- the information processing unit 11 includes a DHCP processing unit 12 and an address duplication confirmation processing unit 13. When the CPU executes the program, the DHCP processing unit 12 and the address duplication confirmation processing unit 13 are virtually configured in the DHCP server 10.
- the DHCP processing unit 12 and the DHCP related information storage unit 16 correspond to a configuration provided in a general DHCP server.
- the address duplication confirmation processing unit 13 and the proxy destination address storage unit 17 are configurations added to the DHCP server of this embodiment.
- the DHCP related information storage unit 16 stores information held by a general DHCPv4 server and a DHCPv6 server.
- the DHCP related information storage unit 16 stores information on the usage status of the generated IP address.
- the usage status information of the IP address indicates whether the generated IP address is “in use”, “unused”, or “unusable”.
- the DHCP related information storage unit 16 manages the IP address assigned by the DHCP processing unit 12 as “in use”.
- the proxy destination address storage unit 17 stores the IP address of the DHCP proxy server 20. In the present embodiment, it is assumed that the IP address of the DHCP proxy server 20 is stored in the proxy destination address storage unit 17 in advance.
- the means used when the proxy destination address storage unit 17 stores the IP address of the DHCP proxy server 20 is not particularly limited.
- the DHCP processing unit 12 distributes and manages IPv4 (Internet Protocol Version 4) / IPv6 network setting information to client terminals.
- the DHCP processing unit 12 has functions of a general DHCPv4 server and a DHCPv6 server, and executes standard protocol processing disclosed in Non-Patent Document 1, Non-Patent Document 2, and the like.
- the DHCP processing unit 12 refers to the DHCP related information storage unit 16 and selects an unused IP address or newly generates an IP address.
- the DHCP processing unit 12 assigns an IP address whose usage status has been confirmed when the IP address has not been used. In addition, when the IP address whose usage status has been confirmed is used, the DHCP processing unit 12 selects or generates another IP address.
- the address duplication confirmation processing unit 13 confirms the actual usage status of the IP address selected or generated by the DHCP processing unit 12.
- the address duplication confirmation processing unit 13 has a function of transmitting a request message and a function of receiving a response message from the DHCP proxy server 20.
- the request message is a message requesting the DHCP proxy server 20 to confirm the use status of the IP address.
- the address duplication confirmation processing unit 13 determines whether or not the IP address whose usage status has been confirmed is actually allocated to the client terminal, according to the result of checking the usage status of the IP address.
- the confirmation result of the use status of the IP address is included in the response message received from the DHCP proxy server 20.
- FIG. 4 is a diagram showing an example of a request message for requesting confirmation of the usage status of the IP address.
- the request message is transmitted from the DHCP server to the DHCP proxy server.
- FIG. 5 is a diagram showing an example of a response message including a confirmation result of the use status of the IP address.
- the response message is transmitted from the DHCP proxy server to the DHCP server.
- the “IP address to be confirmed” column describes the IP address to be used, ie, the IP address determined by the DHCP server 10.
- the “IP address to be confirmed” column describes the IP address that has been confirmed to be used, that is, the IP address designated by the DHCP server 10 in the request message.
- the confirmation result the confirmation result of the use status of the IP address confirmed by the DHCP proxy server 20 is described. Specifically, a value indicating “in use” or “unused” information is described in the “confirmation result” column.
- FIG. 3 is a functional block diagram showing a configuration example of the DHCP proxy server shown in FIG.
- the DHCP proxy server 20 includes an address use confirmation processing unit 21 and a search processing unit 22.
- the DHCP proxy server 20 is provided with a memory (not shown) for storing a program and a CPU (not shown) for executing processing according to the program. That is, the DHCP proxy server 20 is realized by the computer 500 shown in FIG. As the CPU executes the program, the address use confirmation processing unit 21 and the search processing unit 22 are virtually configured in the DHCP proxy server 20.
- the address use confirmation processing unit 21 receives the request message from the DHCP server 10 and transmits a response message including the confirmation result to the DHCP server 10.
- the request message is a message requesting confirmation of the usage status of the designated IP address.
- the search processing unit 22 confirms the usage status of the designated IP address and responds with the result.
- the search processing unit 22 sends an echo request to the subnet connected to the client terminal that requested the IP address assignment, with the address included in the request message as the destination.
- the echo request is a request to the terminal to change the destination of the received message and return it. Further, the search processing unit 22 notifies the address use confirmation processing unit 21 of the presence or absence of an echo response.
- the echo response is a response to the echo request.
- a case of using ICMP will be described in this embodiment, and a case of using ARP (Address Resolution Protocol) will be described in a second embodiment.
- ARP Address Resolution Protocol
- the method of confirming the usage status of the IP address is not limited to using these communication protocols.
- a case where the protocol is IPv4 will be described as an example, but the present embodiment can also be applied to a case where the protocol is IPv6.
- the search processing unit 22 When using ICMP, the search processing unit 22 transmits an ICMP echo request with the specified IP address as the destination. Then, the search processing unit 22 determines that the IP address is used when there is an ICMP echo response. The search processing unit 22 determines that the IP address is not used when there is no ICMP echo response. The search processing unit 22 notifies the address use confirmation processing unit 21 of the presence / absence of an ICMP echo response as a confirmation result.
- FIG. 4 is a flowchart showing the operation procedure of the system of this embodiment.
- Step F01 The client terminal 31 requests IP address assignment by DHCP.
- the procedure of the DHCP protocol conforms to Non-Patent Document 1, which is a standard technology, and detailed description thereof is omitted here.
- the DHCP relay agent function executed by the router 41 an IP address allocation request message is transferred from the client terminal 31 to the DHCP server 10 arranged on the subnet 50B.
- Step F11 When the DHCP server 10 receives the IP address assignment request from the client terminal 31, the DHCP processing unit 12 refers to the DHCP related information storage unit 16 and selects one unused IP address.
- Step F12 The DHCP processing unit 12 requests the address duplication confirmation processing unit 13 to confirm the usage status of the IP address selected in Step F11.
- Step F13 The address duplication confirmation processing unit 13 refers to the proxy destination address storage unit 17 and identifies the IP address of the DHCP proxy server 20. Subsequently, the address duplication confirmation processing unit 13 transmits a message requesting the DHCP proxy server 20 to confirm whether or not the IP address selected by the DHCP processing unit 12 is used.
- Step F21 When the DHCP proxy server 20 receives from the DHCP server 10 a message requesting confirmation of the usage status of the designated IP address, the address usage confirmation processing unit 21 searches for confirmation of the usage status of the designated IP address. Request to the processing unit 22.
- the search processing unit 22 sends an ICMP echo request to the subnet 50A with the designated IP address as the destination. Specifically, the search processing unit 22 sends an ICMP echo request addressed to the IP address in which the subnet 50A is set as the network address to the subnet 50C. The ICMP echo request is read from the network address by the router 42 and transferred to the router 43 via the subnet 50D. In the router 43, since the network address of the ICMP echo request is set to the subnet 50A, the router 43 sends the ICMP echo request to the subnet 50A. In this way, the ICMP echo request reaches the subnet 50A via the subnet 50C, the router 42, the subnet 50D, and the router 43.
- the ICMP echo response reaches the DHCP proxy server 20 through a path reverse to the transfer of the ICMP echo request.
- the search processing unit 22 determines that the designated IP address is used when there is an ICMP echo response, and determines that the designated IP address is not used when there is no ICMP echo response.
- the search processing unit 22 notifies the address use confirmation processing unit 21 of the presence / absence of an ICMP echo response as a confirmation result.
- Step F23 The address usage confirmation processing unit 21 generates a response message including the confirmation result of the usage status of the designated IP address and transmits it to the DHCP server 10.
- Step F14 When the address duplication confirmation processing unit 13 of the DHCP server 10 receives the response message of the confirmation result of the use status of the designated IP address from the DHCP proxy server 20, the address duplication confirmation processing unit 13 notifies the DHCP processing unit 12 of the confirmation result.
- Step F15 Based on the confirmation result notified in Step F14, the DHCP processing unit 12 determines whether or not the target IP address is used.
- Step F16 When the target IP address is not used in the confirmation result notified in Step F14, the DHCP processing unit 12 assigns the IP address to the client terminal 31 according to the DHCP protocol.
- Step F17 If the target IP address is already used in the confirmation result notified in Step F14, the DHCP processing unit 12 returns to Step F11 and selects another IP address.
- Step F02 The client terminal 31 receives an IP address assignment via the router 41 according to the DHCP protocol.
- the DHCP server assigns the same IP address to a plurality of client terminals in duplicate. Can be prevented.
- the reason will be briefly explained.
- the DHCP server designates an IP address to a proxy server connected to a subnet different from that of the own device, and requests confirmation of the usage status.
- the proxy server sends an ICMP echo request with the specified IP address as the destination, the proxy server is connected to a different subnet from the DHCP server, so that the ICMP passes through a communication path other than the network without IP reachability. The echo request is forwarded.
- the proxy server can confirm whether or not the IP address to be confirmed is used in the subnet to which the client terminal as the IP address allocation request source belongs.
- the DHCP server can prevent duplicate assignment of IP addresses by determining whether the target IP address is used based on the confirmation result received from the proxy server.
- the DHCP proxy server uses ICMP to check the usage status of the IP address.
- ARP is used as a communication protocol instead of ICMP.
- a client terminal that does not support ICMP does not respond to the ICMP echo request.
- the IP address duplication check cannot be performed, and the same IP address may be duplicately assigned to a plurality of client terminals.
- ARP that is supported by many client terminals is used when confirming the usage status of the IP address.
- FIG. 7 is a block diagram showing a configuration example of a network including the information processing system of the present embodiment.
- the DHCP proxy server 20 is connected to the subnet 50C as shown in FIG.
- the DHCP proxy server 20 is connected to the subnet 50A. That is, the DHCP proxy server 20 and the client terminal that requests IP address assignment are arranged in the same subnet 50A.
- the search processing unit 22 of the DHCP proxy server 20 transmits an ARP request to the subnet 50A to which the client terminal that requested the IP address assignment is connected, with the designated IP address as the destination. Then, when there is an ARP response, the search processing unit 22 determines that the IP address is being used. The search processing unit 22 determines that the IP address is not used when there is no ARP response.
- step F22 it is possible to use the ARP as the IP address usage status confirmation means in step F22 described with reference to FIG. 6 of the first embodiment.
- the operation in step F22 in the flowchart shown in FIG. 6 corresponds to the configuration described with reference to FIG. 7 and is replaced with the following operation in step F22 'in the present embodiment.
- Step F22 ' The search processing unit 22 of the DHCP proxy server 20 transmits an ARP request to the subnet 50A with the designated IP address as the destination. Then, the search processing unit 22 determines that the IP address is used when there is an ARP response, and determines that the IP address is not used when there is no ARP response. The search processing unit 22 notifies the address use confirmation processing unit 21 of the presence or absence of an ARP response as a confirmation result.
- the DHCP proxy server checks the usage status of the IP address using ARP instead of ICMP as the communication protocol. Since a general client terminal supports ARP necessary for normal communication, even if the client terminal does not respond to ICMP, the DHCP proxy server may check whether an IP address is used. It becomes possible. Even if ICMP is not supported by the client terminal in the search target subnet, the DHCP server refers to the confirmation result by the DHCP proxy server to prevent the same IP address from being assigned to a plurality of client terminals. Can do.
- a program describing the execution procedure of the address duplication prevention method of this embodiment may be installed in a computer including a server.
- the same effect as that of the above-described embodiment can be obtained by installing and executing the program on a computer already connected to the network.
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Abstract
Description
クライアント端末からアドレス割り当ての要求があると、対象とされたアドレスの使用状況の確認を要求する要求メッセージを、自装置が接続される第1のサブネットとは異なる第2のサブネットに送信し、要求メッセージに対する確認結果を含む応答メッセージを第2のサブネットから受信すると、アドレスをクライアント端末に割り当てるか否かを確認結果に基づいて判定するDHCPサーバと、
第2のサブネットに接続され、DHCPサーバから要求メッセージを受信すると、対象とされたアドレスを使用するクライアント端末に対して返信を要求するエコー要求をアドレス割り当てを要求したクライアント端末が接続されたサブネットに送出し、該エコー要求に対する応答の有無を確認結果として含む応答メッセージをDHCPサーバに送信する代理サーバと、
を有する。
クライアント端末からのアドレス割り当ての要求を受けた、第1のサブネットに接続されたDHCPサーバから該第1のサブネットとは異なる第2のサブネットを介して、対象とされたアドレスの使用状況の確認を要求する要求メッセージを受信し、要求メッセージに対する確認結果を含む応答メッセージをDHCPサーバに返信する使用確認処理手段と、
使用確認処理部がDHCPサーバから要求メッセージを受信すると、対象とされたアドレスを使用するクライアント端末に対して返信を要求するエコー要求を、アドレス割り当てを要求したクライアント端末が接続されたサブネットに送出し、該エコー要求に対する応答の有無を確認結果として使用確認処理部に通知する探査処理手段と、
を有する。
クライアント端末からのアドレス割り当ての要求を受けたDHCPサーバから、対象とされたアドレスの使用状況の確認を要求する要求メッセージを受信すると、対象とされたアドレスを使用するクライアント端末に対して返信を要求するエコー要求を、アドレス割り当てを要求したクライアント端末が接続されたサブネットに送出し、
エコー要求に対する応答の有無を、要求メッセージに対する確認結果として含む応答メッセージを生成し、
生成した応答メッセージをDHCPサーバに返信する。
クライアント端末からのアドレス割り当ての要求を受けたDHCPサーバから、対象とされたアドレスの使用状況の確認を要求する要求メッセージを受信すると、対象とされたアドレスを使用するクライアント端末に対して返信を要求するエコー要求を、アドレス割り当てを要求したクライアント端末が接続されたサブネットに送出する手順と、
エコー要求に対する応答であるエコー応答の有無を、要求メッセージに対する確認結果として含む応答メッセージを生成する手順と、
生成した応答メッセージをDHCPサーバに返信する手順を実行させるプログラムを非一時的に格納する。
・ROM(Read Only Memory)502
・RAM(Random Access Memory)503
・RAM503にロードされるプログラム504
・プログラム504を格納する記憶装置505
・記録媒体506の読み書きを行うドライブ装置507
・通信ネットワーク509と接続する通信インターフェース508
・データの入出力を行う入出力インターフェース510
・各構成要素を接続するバス511
各実施形態における各装置の各構成要素は、これらの機能を実現するプログラム504をCPU501が取得して実行することで実現される。各装置の各構成要素の機能を実現するプログラム504は、例えば、予め記憶装置505やRAM503に格納されており、必要に応じてCPU501が読み出す。なお、プログラム504は、通信ネットワーク509を介してCPU501に供給されてもよいし、予め記録媒体506に格納されており、ドライブ装置507が当該プログラムを読み出してCPU501に供給してもよい。
本実施形態の情報処理システムを含むネットワークの構成を説明する。図1は本実施形態の情報処理システムを含むネットワークの一構成例を示すブロック図である。
第1の実施形態では、DHCP代理サーバがIPアドレスの使用状況の確認にICMPを用いたが、本実施形態では、通信プロトコルとして、ICMPの代わりにARPを利用する。
20 DHCP代理サーバ
21 アドレス使用確認処理部
22 探査処理部
Claims (6)
- クライアント端末からアドレス割り当ての要求があると、対象とされたアドレスの使用状況の確認を要求する要求メッセージを、自装置が接続される第1のサブネットとは異なる第2のサブネットに送信し、該要求メッセージに対する確認結果を含む応答メッセージを前記第2のサブネットから受信すると、前記アドレスを前記クライアント端末に割り当てるか否かを前記確認結果に基づいて判定するDHCPサーバと、
前記第2のサブネットに接続され、前記DHCPサーバから前記要求メッセージを受信すると、前記対象とされたアドレスを使用するクライアント端末に対して返信を要求するエコー要求を、前記アドレス割り当てを要求したクライアント端末が接続されたサブネットに送出し、該エコー要求に対する応答の有無を前記確認結果として含む前記応答メッセージを前記DHCPサーバに送信する代理サーバと、
を有する情報処理システム。 - クライアント端末からのアドレス割り当ての要求を受けた、第1のサブネットに接続されたDHCPサーバから、該第1のサブネットとは異なる第2のサブネットを介して対象とされたアドレスの使用状況の確認を要求する要求メッセージを受信し、該要求メッセージに対する確認結果を含む応答メッセージを前記DHCPサーバに返信する使用確認処理手段と、
前記使用確認処理部が前記DHCPサーバから前記要求メッセージを受信すると、前記対象とされたアドレスを使用するクライアント端末に対して返信を要求するエコー要求を、前記アドレス割り当てを要求したクライアント端末が接続されたサブネットに送出し、該エコー要求に対する応答の有無を前記確認結果として前記使用確認処理部に通知する探査処理手段と、
を有する代理サーバ。 - 前記エコー要求はICMP(Internet Control Message Protocol)エコー要求またはARP(Address Resolution Protocol)要求である、請求項2に記載の代理サーバ。
- 前記クライアント端末が前記第2のサブネットに接続されている場合、前記探査処理手段は、前記エコー要求として前記ARP要求を利用する、請求項3に記載の代理サーバ。
- DHCPサーバとは異なるサブネットに接続された代理サーバによるアドレス重複防止方法であって、
クライアント端末からのアドレス割り当ての要求を受けた前記DHCPサーバから、対象とされたアドレスの使用状況の確認を要求する要求メッセージを受信すると、前記対象とされたアドレスを使用するクライアント端末に対して返信を要求するエコー要求を、前記アドレス割り当てを要求したクライアント端末が接続されたサブネットに送出し、
前記エコー要求に対する応答の有無を、前記要求メッセージに対する確認結果として含む応答メッセージを生成し、
生成した前記応答メッセージを前記DHCPサーバに返信する、アドレス重複防止方法。 - DHCPサーバとは異なるサブネットに接続されたコンピュータに、
クライアント端末からのアドレス割り当ての要求を受けた前記DHCPサーバから、対象とされたアドレスの使用状況の確認を要求する要求メッセージを受信すると、前記対象とされたアドレスを使用するクライアント端末に対して返信を要求するエコー要求を、前記アドレス割り当てを要求したクライアント端末が接続されたサブネットに送出する手順と、
前記エコー要求に対する応答の有無を、前記要求メッセージに対する確認結果として含む応答メッセージを生成する手順と、
生成した前記応答メッセージを前記DHCPサーバに返信する手順を実行させるプログラムを格納した、コンピュータ読み取り可能記録媒体。
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CN109428983A (zh) * | 2017-08-31 | 2019-03-05 | 佳能株式会社 | 信息处理装置及其控制方法和存储介质 |
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EP3919344A1 (en) * | 2020-06-05 | 2021-12-08 | Mitsubishi Electric R&D Centre Europe B.V. | Method for geolocating an interference source in a communication-based transport system |
CN114374670B (zh) * | 2021-12-29 | 2024-04-30 | 中国电信股份有限公司 | 管理ip资源池的方法、装置、dhcp服务器及存储介质 |
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