JP6175806B2 - COMMUNICATION INFORMATION DETECTING DEVICE, COMMUNICATION INFORMATION DETECTING METHOD, AND PROGRAM - Google Patents

Description

  The present invention relates to IPv6 (Internet Protocol version 6) technology.

  Currently, IPv6 is already supported in various terminals such as personal computers and portable devices, and IPv6 packets are already flowing through the network. In addition, the global address newly acquired in the future is only an IPv6 address, and the IPv6 of the network will be further rapidly advanced in the future. Thereby, the environment where IPv4 and IPv6 coexist will expand in the future.

  Here, as prior art documents dealing with IPv6 addresses, there are Patent Documents 1 to 3 shown below.

JP 2010-157798 A JP 2008-016972 A JP 2007-028171 A

  At present, not only the public network but also the private network such as a corporate network is in a situation where the usage form of IPv6 is not grasped. For example, there is a high possibility that an IPv4 address is managed for each terminal in a network, but whether each terminal supports IPv6, whether each terminal performs IPv6 communication, etc. Not managed.

  Such a situation is explained by the following characteristics of IPv6. First, in IPv6, a plurality of IPv6 addresses are set for one network interface. The IPv6 address is provided with a scope such as a link local scope, a global scope, and a unique local scope, and a plurality of IPv6 addresses such as a link local address, a global address, a unique local address, and the like are provided according to these scopes. Is set.

  IPv6 has an automatic address setting function. For example, the link local address is automatically set according to the data link layer address (MAC (Media Access Control) address or the like) when the IPv6 protocol stack is activated. The global address is automatically set according to RA (Router Advertisement) or DHCPv6 (Dynamic Host Configuration Protocol for IPv6). In addition, the IPv6 address can be set manually. Further, the state of the IPv6 address is managed, and there may be an address that is updated like a temporary address defined by RFC (Request for Comments) 3041, or an address that is discarded when it expires.

  As described above, in the IPv6 environment, a plurality of IPv6 addresses are set in each communication device in a state not intended by the user, and the set IPv6 addresses are updated according to time. Therefore, it is very difficult to accurately grasp the usage form of IPv6.

  However, if the introduction of IPv6 proceeds in such an unmanaged state, there is a possibility of falling into a kind of chaos state. In such a chaotic state, communication failure such as communication failure and communication delay may occur. For example, in order to shift from IPv4 to IPv6, the communication stack of each terminal performs a fallback process in which IPv6 communication is preferentially executed and IPv4 communication is performed when IPv6 communication fails. In this fallback process, a waiting time is normally set for determining that the IPv6 communication is unsuccessful, which causes a communication delay.

  Therefore, when IPv6 is introduced, it is important to properly sort the chaos state as described above and reduce the influence of communication failure. In other words, it is important to correctly grasp the usage mode of IPv6 in the network. However, if many restrictions are provided on the non-detection side in order to grasp this, it will not be possible to cope with the current large number of networks in various forms. The restrictions on the non-detection side include, for example, the necessity of function addition and function correction for each communication device on the non-detection side, network conditions, and the like.

  The present invention has been made in consideration of such points, and provides a technique for grasping the IPv6 usage modes of various communication devices with high versatility.

The first communication information detection apparatus provided by the present invention includes address information acquisition means for acquiring address information indicating both an IPv6 address and a layer 2 address held by a node holding an IPv6 address and a layer 2 address. Candidate address generating means for generating a candidate address that is an IPv6 address not indicated in the address information and is an IPv6 address presumed to be held by the node, based on the address information; and the candidate address Address confirmation means for confirming whether or not the information is held by the node, and candidate interface ID calculation means for converting a layer 2 address indicated by the address information by a predetermined method and calculating a candidate interface ID. Have.
The candidate address generation means generates the candidate address whose network prefix is the network prefix of the IPv6 address indicated by the address information and whose interface ID is the candidate interface ID.
The second communication information detection apparatus provided by the present invention includes address information acquisition means for acquiring address information indicating both an IPv6 address and a layer 2 address held by a node holding an IPv6 address and a layer 2 address; Candidate address generating means for generating a candidate address that is an IPv6 address not indicated in the address information and is an IPv6 address presumed to be held by the node, based on the address information; and the candidate address Is stored in the node, an address confirmation means for confirming whether or not the information is held by the node, and a pre-store for storing prefix information including a network prefix that is a known network prefix and is different from the network prefix of the IPv6 address indicated by the address information. Fix information storing means, a candidate interface ID calculating means for converting a layer 2 address indicated by the address information by a predetermined method and calculating a candidate interface ID, and an interface ID of an IPv6 address indicated by the address information is the address Determination means for determining whether or not the candidate interface ID calculated from the layer 2 address indicated by the information matches.
The candidate address generation unit, when the determination unit determines that the interface ID of the IPv6 address indicated by the address information matches the candidate interface ID calculated from the layer 2 address indicated by the address information, Is the network prefix acquired from the prefix information storage means, and the interface ID is the interface address of the IPv6 address indicated by the address information.
Further, when the candidate address generation unit determines that the interface ID of the IPv6 address indicated by the address information does not match the candidate interface ID calculated from the layer 2 address indicated by the address information by the determination unit The network prefix is the network prefix of the IPv6 address indicated by the address information, and the candidate address whose interface ID is the candidate interface ID is generated.

The first program provided by the present invention is a program that causes a computer to function as the first communication information detection apparatus. The program causes the computer to have the functions of each functional component of the communication information detection apparatus provided by the present invention.
The second program provided by the present invention is a program that causes a computer to function as the second communication information detection apparatus. The program causes the computer to have the functions of each functional component of the communication information detection apparatus provided by the present invention.

The first communication information detection method provided by the present invention is executed by a computer. The communication information detection method is shown in the address information acquisition step of acquiring address information indicating both the IPv6 address and the layer 2 address held by the node holding the IPv6 address and the layer 2 address, and the address information. A candidate address generation step of generating a candidate address that is an IPv6 address that is not yet an IPv6 address that is assumed to be held by the node based on the address information, and the candidate address is held by the node And an address confirmation step for confirming whether or not the layer 2 address indicated by the address information is converted by a predetermined method and a candidate interface ID is calculated .
In the candidate address generation step, the candidate address whose network prefix is the network prefix of the IPv6 address indicated by the address information and whose interface ID is the candidate interface ID is generated.
The second communication information detection method provided by the present invention is executed by a computer. The communication information detection method is shown in the address information acquisition step of acquiring address information indicating both the IPv6 address and the layer 2 address held by the node holding the IPv6 address and the layer 2 address, and the address information. A candidate address generation step of generating a candidate address that is an IPv6 address that is not yet an IPv6 address that is assumed to be held by the node based on the address information, and the candidate address is held by the node An address confirmation step for confirming whether the address information is present, a layer 2 address indicated by the address information is converted by a predetermined method to calculate a candidate interface ID, and an IPv6 address indicated by the address information Interface I But having a determination step of determining whether the match the candidate interface ID which is calculated from the layer 2 addresses the address information indicates.
The computer has prefix information storage means for storing prefix information including a network prefix that is a known network prefix and that is different from the network prefix of the IPv6 address indicated by the address information.
In the candidate address generation step, 1) when it is determined in the determination step that the interface ID of the IPv6 address indicated by the address information matches the candidate interface ID calculated from the layer 2 address indicated by the address information, Generating a candidate address in which a network prefix is a network prefix acquired from the prefix information storage means and an interface ID is an interface ID of an IPv6 address indicated by the address information; and 2) in the determination step, the address information When it is determined that the interface ID of the IPv6 address indicated by the address information does not match the candidate interface ID calculated from the layer 2 address indicated by the address information, Ikkusu is a network prefix of the IPv6 address indicated by the address information, interface ID generates the candidate address is the candidate interface ID.

  According to each aspect described above, it is possible to provide a technique for grasping the IPv6 usage mode of various communication devices with high versatility.

It is a block diagram which shows the communication information detection apparatus which concerns on Embodiment 1. FIG. It is a figure which shows the structure of an IPv6 address. It is a block diagram which shows the hardware constitutions of the communication information detection apparatus which concerns on Embodiment 1. FIG. 6 is a flowchart illustrating a flow of communication information detection processing by the communication information detection apparatus according to the first embodiment. It is a block diagram which shows the communication information detection apparatus which concerns on the modification 1-1. It is a block diagram which shows the communication information detection apparatus which concerns on Embodiment 2. FIG. It is a figure which shows notionally the method in which the candidate address generation part of Embodiment 2 produces | generates a candidate address. 6 is a flowchart illustrating a flow of communication information detection processing by the communication information detection apparatus according to the second embodiment. It is a block diagram which shows the communication information detection apparatus which concerns on Embodiment 3. It is a figure which shows notionally the method in which the candidate address generation part of Embodiment 3 produces | generates a candidate address. 10 is a flowchart illustrating a flow of communication information detection processing by the communication information detection apparatus according to the third embodiment. It is a block diagram which shows the communication information detection apparatus which concerns on Embodiment 4. It is a figure which shows notionally the method in which the candidate address generation part of Embodiment 4 produces | generates a candidate address. 10 is a flowchart illustrating a flow of communication information detection processing by the communication information detection apparatus according to the fourth embodiment. It is a block diagram which shows the communication information detection apparatus which concerns on Embodiment 5. FIG. 10 is a flowchart illustrating a flow of communication information detection processing by the communication information detection apparatus according to the fifth embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same reference numerals are given to the same components, and the description will be omitted as appropriate.

[Embodiment 1]
FIG. 1 is a block diagram illustrating a communication information detection apparatus 2000 according to the first embodiment. In FIG. 1, arrows indicate the flow of information. In FIG. 1, each block shows a functional unit configuration, not a hardware unit configuration.

<Assumed environment>
The communication information detection apparatus 2000 is connected to a node 3000 having an IPv6 address and a layer 2 address through a network 4000 so as to communicate with each other. Here, the node is a network interface. The network interface is provided in a computer such as a PC (Personal Computer), a server computer, or a portable computer. The node may be a physical network interface or a virtual network interface. The virtual network interface is, for example, a virtual NIC (Network Interface Card) included in the virtual computer. The node 3000 may have a plurality of IPv6 addresses. A plurality of nodes 3000 may exist.

  The network 4000 connecting the communication information detection device 2000 and the node 3000 may be a wired network, a wireless network, or a network in which wired and wireless are mixed.

  The IPv6 address is a 128-bit address. The IPv6 address is a combination of a network prefix and an interface ID. For example, as shown in FIG. 2, the IPv6 address has a 64-bit network prefix and a 64-bit interface ID. Here, the length of the network prefix and the length of the interface ID are not limited to 64 bits. However, the total of the length of the network prefix and the length of the interface ID is 128 bits.

  The network prefix is an identifier of a subnetwork at the network layer (layer 3) level of the OSI (Open Systems Interconnection) reference model. Each node having an IPv6 address with a common network prefix belongs to the same subnetwork at the layer 3 level. The interface ID is an identifier for identifying each node belonging to the same subnetwork at the layer 3 level.

  The layer 2 address is an address handled in the data link layer (layer 2) of the OSI reference model. The layer 2 address is, for example, a MAC address in the Ethernet (registered trademark) protocol.

  Under the assumed environment described above, the communication information detection apparatus 2000 collects the usage forms of the IPv6 address by the node 3000. Specifically, the communication information detection apparatus 2000 determines an IPv6 address that is not indicated in address information described later, from among the IPv6 addresses held by the node 3000.

<Address information acquisition unit 2020>
The communication information detection apparatus 2000 includes an address information acquisition unit 2020. The address information acquisition unit 2020 receives address information. The address information indicates one or more of an IPv6 address held by the node 3000 and a layer 2 address held by the node 3000.

  The address information acquisition unit 2020 acquires address information by various methods. For example, the address information acquisition unit 2020 accepts manual input of address information. In addition, for example, the address information acquisition unit 2020 acquires address information from another device that stores the address information.

  In addition, for example, the address information acquisition unit 2020 may extract a layer 2 address or an IPv6 address from data flowing on the network 4000. For example, the communication information detection apparatus 2000 extracts the layer 2 address from the header of the layer 2 frame included in the data flowing on the network 4000. Further, the communication information detection apparatus 2000 extracts an IPv6 address from the header of the IPv6 packet included in the data flowing on the network 4000. In this case, the communication information detection apparatus 2000 treats the node that holds the extracted layer 2 address, IPv6 address, or a combination of the layer 2 address and the IPv6 address as the node 3000. Further, the communication information detection apparatus 2000 treats the extracted layer 2 address, IPv6 address, or a combination of the layer 2 address and the IPv6 address as address information of the node 3000.

<Candidate address generation unit 2080>
The communication information detection apparatus 2000 includes a candidate address generation unit 2080. Candidate address generation unit 2080 generates a candidate address based on the address information of node 3000. The candidate address is an IPv6 address that is not indicated in the address information of the node 3000 and is assumed to be held by the node 3000.

  In general, when the node 3000 holds a plurality of IPv6 addresses, there is often a relationship between the plurality of IPv6 addresses. For example, a plurality of IPv6 addresses held by the node 3000 may have a common interface ID. Therefore, when the address information of the node 3000 indicates an IPv6 address, for example, the communication information detection apparatus 2000 determines a part of the candidate address using the network prefix or interface ID of the IPv6 address indicated by the address information.

  In many cases, there is also a relationship between the IPv6 address held by the node 3000 and the layer 2 address. For example, the interface ID of the IPv6 address held by the node 3000 may be a value obtained by converting the layer 2 address of the node 3000 according to a certain rule. Therefore, when the address information of the node 3000 indicates a layer 2 address, for example, the communication information detection apparatus 2000 determines a part of the candidate address based on, for example, the layer 2 address indicated by the address information.

<Address confirmation unit 2100>
The communication information detection apparatus 2000 includes an address confirmation unit 2100. The address confirmation unit 2100 confirms whether the candidate address is held by the node 3000.

  The address confirmation unit 2100 confirms whether or not the candidate address is held by the node 3000 using, for example, an NS (Neighbor Solicitation) message defined in IPv6. Below, the example of the specific method is demonstrated.

  The address confirmation unit 2100 stores the candidate address at the target address indicated by the NS message. Then, the address confirmation unit 2100 broadcasts the NS message at the layer 2 level. When receiving the NS message, the IPv6 node holding the candidate address transmits an NA (Neighbor Advertisement) message defined in IPv6 to the communication information detecting apparatus 2000. At this time, the IPv6 node that transmits the NA message stores its layer 2 address in the source address indicated by the NA message.

  Then, the communication information detection apparatus 2000 compares the source address indicated by the received NA message with the layer 2 address of the node 3000. When the source address indicated by the NA message matches the layer 2 address of the node 3000, the address confirmation unit 2100 determines that the candidate address is held by the node 3000. Here, since the address confirmation unit 2100 performs the above comparison, the communication information detection apparatus 2000 needs to acquire the layer 2 address of the node 3000. This method will be described later.

  On the other hand, when the source address indicated by the NA message does not match the layer 2 address of the node 3000, the address confirmation unit 2100 determines that the candidate address is not held by the node 3000. In this case, the communication information detection apparatus 2000 may associate the source address (layer 2 address) indicated by the NA message with the candidate address (IPv6 address) to generate new address information.

  The communication information detection apparatus 2000 determines that the candidate address is not held by the node 3000 when the NA message is not received even after the elapse of a predetermined length or longer after the NS message is transmitted, for example. Furthermore, in this case, the communication information detection apparatus 2000 can recognize that there is no IPv6 node that holds a candidate address among the nodes that are communicably connected to the communication information detection apparatus 2000.

  The communication information detection apparatus 2000 acquires the layer 2 address of the node 3000 by the following method. First, when the address information of the node 3000 indicates a layer 2 address, the communication information detection apparatus 2000 acquires the layer 2 address of the node 3000 from the address information. When the layer 2 address of the node 3000 is not indicated in the address information, for example, the communication information detection apparatus 2000 acquires the layer 2 address of the node 3000 using the NS message. Specifically, the communication information detection apparatus 2000 stores the IPv6 address indicated in the address information in the target address of the NS message, and transmits the NS message. Then, the communication information detection apparatus 2000 acquires the layer 2 address of the node 3000 from the received NA message.

<Hardware configuration>
FIG. 3 is a block diagram illustrating a hardware configuration of the communication information detection apparatus 2000 according to the first embodiment. In FIG. 3, the communication information detection apparatus 2000 includes a bus 1020, a CPU 1040, a RAM 1060, a storage 1080, and a network interface 1100.

  The bus 1020 is a transmission path for the CPU 1040, the RAM 1060, the storage 1080, and the network interface 1100 to transmit / receive information to / from each other.

  The network interface 1100 is a network interface that communicates with the node 3000 via the network 4000. The network interface 1100 may be a network interface that connects a wireless line or a network interface that connects a wired line.

  The CPU 1040 implements the function of the address information acquisition unit 2020 by executing the address information acquisition module 1220. The CPU 1040 implements the function of the candidate address generation unit 2080 by executing the candidate address generation module 1260. The CPU 1040 implements the function of the address confirmation unit 2100 by executing the address confirmation module 1280.

  The address information acquisition module 1220, the candidate address generation module 1260, and the address confirmation module 1280 are stored in the storage 1080, for example. Then, each of the modules is read by the CPU 1040, for example, into the RAM 1060. Here, each of the modules may be stored in the RAM 1060. Moreover, when the communication information detection apparatus 2000 has a ROM, each of the modules may be stored in the ROM.

  The storage 1080 is a storage device such as a hard disk, a USB memory, or an SSD (Solid State Drive). The storage 1080 may be a storage device such as a RAM or a ROM.

<Flow of communication information detection process>
FIG. 4 is a flowchart illustrating a flow of communication information detection processing performed by the communication information detection apparatus 2000 according to the first embodiment.

  In step S102, the address information acquisition unit 2020 acquires the address information of the node 3000.

  In step S104, the candidate address generation unit 2080 generates a candidate address based on the address information.

  In step S <b> 106, the address confirmation unit 2100 confirms whether the candidate address is held by the node 3000.

<Action and effect>
Since the IPv6 address is a 128-bit address, the address space is wide. Therefore, it takes a long time to collect IPv6 addresses held by the node 3000 by brute force. Therefore, it is practically impossible to check the usage mode of the IPv6 address by the node 3000 by brute force.

  Accordingly, the communication information detection apparatus 2000 generates a candidate address that is assumed to be held by the node 3000 based on address information indicating one or more of the layer 2 address of the node 3000 and the IPv6 address of the node 3000. . As described above, there is often a relationship between a plurality of IPv6 addresses held by the node 3000 or between an IPv6 address held by the node 3000 and a layer 2 address. Therefore, the communication information detection apparatus 2000 considers such characteristics of the IPv6 address, and associatively generates an IPv6 address presumed to be held by the node 3000 from a known IPv6 address or a layer 2 address. As a result, according to the communication information detection apparatus 2000 of the present embodiment, IPv6 addresses not indicated in the address information among the IPv6 addresses held by the node 3000 are collected in a short time.

  When the node 3000 holds a plurality of IPv6 addresses, a plurality of IPv6 addresses held by the node 3000 are linked by using the communication information detection apparatus 2000. If the layer 2 address held by the node 3000 is acquired, the IPv6 address held by the node 3000 and the layer 2 address are linked.

  Further, it is assumed that the node 3000 further holds an IPv4 address. In this case, if the IPv4 address of the node 3000 is acquired, the IPv6 address and the IPv4 address held by the node 3000 are linked. If the layer 2 address held by the node 3000 is acquired, the IPv4 address, IPv6 address, and layer 2 address held by the node 3000 are linked. Here, since the method of acquiring the IPv4 address of the node is a known method, the description thereof is omitted.

<Modification 1-1>
The communication information detection apparatus 2000 of Embodiment 1 may further have the following functions. The communication information detection apparatus 2000 according to the first embodiment having the following functions is referred to as a communication information detection apparatus 2000 according to Modification 1-1. FIG. 5 is a block diagram illustrating a communication information detection apparatus 2000 according to Modification 1-1.

  The communication information detection apparatus 2000 of Modification 1-1 further includes an address information storage unit 2140 that stores the address information acquired by the address information acquisition unit 2020.

  The address confirmation unit 2100 of Modification 1-1 updates the address information of the node 3000. Specifically, the address confirmation unit 2100 adds the candidate address confirmed as the IPv6 address held by the node 3000 to the node information of the node 3000 as the IPv6 address held by the node 3000.

<Action and effect>
According to the communication information detection apparatus 2000 of the modified example 1-1, the usage form of the IPv6 address by the node 3000 is stored as address information. When the node 3000 holds a plurality of IPv6 addresses, a plurality of IPv6 addresses held by the node 3000 are linked as address information. If the layer 2 address held by the node 3000 is acquired, the IPv6 address and the layer 2 address held by the node 3000 are linked as address information.

  Further, it is assumed that the node 3000 further holds an IPv4 address. In this case, if the IPv4 address of the node 3000 is acquired, the IPv6 address and the IPv4 address held by the node 3000 are linked as address information. If the layer 2 address held by the node 3000 is acquired, the IPv4 address, IPv6 address, and layer 2 address held by the node 3000 are linked as address information.

<Modification 1-2>
The address confirming unit 2100 of the modification 1-1 has a function of determining whether or not the candidate address is a known IPv6 address before confirming whether or not the candidate address is held by the node 3000. You may have. The communication information detection apparatus 2000 according to the first embodiment in which the address confirmation unit 2100 has the above function is referred to as a communication information detection apparatus 2000 according to Modification 1-2.

  Here, the communication information detection apparatus 2000 according to the modified example 1-2 treats the IPv6 address indicated in the address information stored in the address information storage unit 2140 as a known IPv6 address. Specifically, an IPv6 address corresponding to one of the following two is treated as known. The first case is a case where the IPv6 address matches the IPv6 address indicated by any of the address information acquired by the address information acquisition unit 2020 so far. The second case is a case where the IPv6 address matches the candidate address that has been confirmed by the address confirmation unit 2100 so far as being held in a certain node.

  The address confirmation unit 2100 determines whether the candidate address is included in the address information stored in the address information storage unit 2140 before confirming whether the candidate address is held by the node 3000. judge. When the candidate address is included in the address information, the address confirmation unit 2100 does not confirm whether the candidate address is held by the node 3000.

<Action and effect>
The communication information detection apparatus 2000 according to the modified example 1-2 does not confirm whether or not the candidate address that is a known IPv6 address is held by the node 3000. Therefore, when the communication information detection apparatus 2000 according to the modified example 1-2 is used, the number of communications performed by the communication information detection apparatus 2000 with respect to the node 3000 decreases, and the amount of data flowing through the network 4000 decreases. As a result, when the communication information detection apparatus 2000 according to Modification 1-2 is used, the communication load on the network 4000 is reduced.

[Embodiment 2]
FIG. 6 is a block diagram illustrating a communication information detection apparatus 2000 according to the second embodiment. Here, among the functional components shown in FIG. 6, the functional components shown in FIG. 1 having the same reference numerals have the same functions as the functional components shown in FIG. In FIG. 6, each functional configuration unit indicates a functional unit configuration, not a hardware unit configuration.

<Address information acquisition unit 2020>
The address information acquisition unit 2020 according to the second embodiment acquires address information indicating the IPv6 address of the node 3000.

<Prefix information storage unit 2060>
The communication information detection apparatus 2000 according to the second embodiment includes a prefix information storage unit 2060. The prefix information storage unit 2060 stores prefix information that is a known network prefix and includes a network prefix that is different from the network prefix of the IPv6 address of the node 3000 indicated by the address information. However, the prefix information may include a network prefix of the IPv6 address of the node 3000 indicated by the address information.

  There are various methods by which the prefix information storage unit 2060 obtains prefix information. For example, the prefix information storage unit 2060 acquires the network prefix when the communication information detection apparatus 2000 receives a network prefix notification from the router. The prefix information storage unit 2060 stores prefix information indicating the acquired network prefix.

  For example, the communication information detection apparatus 2000 uses an RS (Router Solicitation) message defined in IPv6, and acquires the network prefix of the subnetwork managed by each router from each router. Here, since the method of acquiring the network prefix managed by each router using the RS message is a known method, the description thereof is omitted.

  In addition, for example, the prefix information storage unit 2060 may accept manual input of prefix information. In addition, for example, the prefix information storage unit 2060 may acquire prefix information from another device.

<Candidate address generation unit 2080>
The candidate address generation unit 2080 according to the second embodiment generates a candidate address using the network prefix stored in the prefix information storage unit 2060 and the interface ID of the IPv6 address indicated by the address information.

  Specifically, the candidate address generation unit 2080 uses a known network prefix stored in the prefix information storage unit 2060 as the network prefix of the candidate address. The candidate address generation unit 2080 uses the interface ID of the IPv6 address indicated by the address information as the interface ID of the candidate address.

  FIG. 7 is a diagram conceptually illustrating a method by which the candidate address generation unit 2080 according to the second embodiment generates candidate addresses. Here, in the example of FIG. 7, the prefix information indicates three network prefixes 2001: 0db8: 0101: 0001, 2001: 0db8: 0234: 0101, and 2001: 0db8: ffff: 0132. The address information indicates an IPv6 address of 2001: 0db8: 0000: 0001: 0000: 0000: 0000: 0000A.

  Therefore, the candidate address generation unit 2080 uses 2001: 0db8: 0101: 0001, which is one of the network prefixes indicated by the prefix information, as the network prefix of the candidate address. The candidate address generation unit 2080 uses 0000: 0000: 0000: 0000A, which is the interface ID of the IPv6 address indicated by the address information, as the interface ID of the candidate address. As a result, the candidate address generation unit 2080 generates an IPv6 address of 2001: 0db8: 0101: 0001: 0000: 0000: 0000: 0000A as the candidate address.

<Flow of communication information detection process>
FIG. 8 is a flowchart illustrating a flow of communication information detection processing performed by the communication information detection apparatus 2000 according to the second embodiment.

  In step S <b> 202, the address information acquisition unit 2020 acquires the address information of the node 3000.

  In step S204, the candidate address generation unit 2080 obtains a known network prefix from the prefix information storage unit 2060.

  In step S206, the candidate address generation unit 2080 generates a candidate address using the network prefix acquired from the prefix information storage unit 2060 and the interface ID of the IPv6 address indicated by the address information.

  In step S <b> 208, the address confirmation unit 2100 confirms whether the candidate address is held by the node 3000.

  Here, it is assumed that the prefix information storage unit 2060 stores a plurality of network prefixes. In this case, the candidate address generation unit 2080 may generate a candidate address for one network prefix, or may generate a candidate address for each of a plurality of network prefixes. When the candidate address generation unit 2080 generates a plurality of candidate addresses, for example, the address confirmation unit 2100 confirms whether or not the candidate address is held by the node 3000 for each of the generated candidate addresses.

<Action and effect>
The communication information detection apparatus 2000 uses the known network prefix and the interface ID of the IPv6 address held by the node 3000 to associatively generate an IPv6 address that is assumed to be held by the node 3000. Since the communication information detection apparatus 2000 and the node 3000 are connected to be communicable, the node 3000 is highly likely to belong to a subnetwork known by the communication information detection apparatus 2000. Therefore, by using the communication information detection apparatus 2000 of the second embodiment, the IPv6 addresses held by the node 3000 are collected in a short time.

[Embodiment 3]
FIG. 9 is a block diagram illustrating a communication information detection apparatus 2000 according to the third embodiment. Here, among the functional components shown in FIG. 9, the functional components shown in FIG. 1 or 6 are the same as the functional components shown in FIG. 1 or FIG. It has a function. In FIG. 9, each functional configuration unit indicates a functional unit configuration, not a hardware unit configuration.

<Address information acquisition unit 2020>
The address information acquisition unit 2020 according to the third embodiment receives address information indicating the IPv6 address of the node 3000 and the layer 2 address of the node 3000.

<Candidate interface ID calculation unit 2040>
The communication information detection apparatus 2000 includes a candidate interface ID calculation unit 2040. The candidate interface ID calculation unit 2040 converts the layer 2 address indicated by the address information by a predetermined method, and calculates a candidate interface ID.

  Here, as a general method for assigning an IPv6 address to a node, the MAC address of the node is converted into a value in the EUI-64 (registered trademark) format, and the IPv6 address interface of the node is used by using the value. There is a method for determining the ID. Since this method is a known method, a detailed description of this method is omitted. Therefore, the predetermined method is, for example, a method of converting the layer 2 address of the node 3000 into a value in the EUI-64 (registered trademark) format and using the value.

<Candidate address generation unit 2080>
The candidate address generation unit 2080 generates a candidate address using the network prefix of the IPv6 address indicated by the address information and the candidate interface ID calculated by the candidate interface ID calculation unit 2040. Specifically, the candidate address generation unit 2080 uses the network prefix of the IPv6 address indicated by the address information as the network prefix of the candidate address. Further, the candidate address generation unit 2080 uses the candidate interface ID calculated by the candidate interface ID calculation unit 2040 as the interface ID of the candidate address.

  FIG. 10 is a diagram conceptually illustrating a method by which the candidate address generation unit 2080 according to the third embodiment generates a candidate address. Here, in the example of FIG. 10, the address information indicates an IPv6 address of 2001: 0db8: 0000: 0001: 0000: 0000: 0000: 0000A. Further, the address information indicates a layer 2 address of XX: XX: XX: XX: XX: XX. Then, the candidate interface ID calculation unit 2040 converts the layer 2 address indicated by the address information by a predetermined method, and generates a candidate interface ID of 0000: 0000: 0000: 0000B.

  Therefore, the candidate address generation unit 2080 uses 2001: 0db8: 0000: 0001, which is the network prefix of the IPv6 address indicated by the address information, as the network prefix of the candidate address. Further, the candidate address generation unit 2080 uses 0000: 0000: 0000: 0000B that is a candidate interface ID as the interface ID of the candidate address. As a result, the candidate address generation unit 2080 generates an IPv6 address of 2001: 0db8: 0000: 0001: 0000: 0000: 0000: 0000B as the candidate address.

<Flow of communication information detection process>
FIG. 11 is a flowchart illustrating a flow of communication information detection processing performed by the communication information detection apparatus 2000 according to the third embodiment.

  In step S302, the address information acquisition unit 2020 acquires the address information of the node 3000.

  In step S304, the candidate interface ID calculation unit 2040 calculates a candidate interface ID from the layer 2 address indicated by the address information.

  In step S306, the candidate address generation unit 2080 generates a candidate address using the network prefix of the IPv6 address indicated by the address information and the candidate interface ID calculated by the candidate interface ID calculation unit 2040.

  In step S308, the address confirmation unit 2100 confirms whether the candidate address is held by the node 3000.

<Action and effect>
According to the present embodiment, the communication information detection apparatus 2000 uses the IPv6 address indicated by the address information and the layer 2 address indicated by the address information to associatively determine the IPv6 address that is assumed to be held by the node 3000. Generate. Here, as described above, there is often a relationship between the IPv6 address held by the node 3000 and the layer 2 address held by the node 3000. Therefore, the communication information detection apparatus 2000 considers such characteristics of the IPv6 address, and associatively generates an IPv6 address that is assumed to be held by the node 3000 from the known IPv6 address and the layer 2 address. . As a result, IPv6 addresses held by the node 3000 are collected in a short time.

<Modification 3-1>
The communication information detection apparatus 2000 according to the third embodiment may have a function of further generating candidate addresses by the same method as the communication information detection apparatus 2000 according to the second embodiment. The communication information detection apparatus 2000 in this case is referred to as a communication information detection apparatus 2000 of Modification 3-1.

<Action and effect>
By using the communication information detection apparatus 2000 of the modified example 3-1, more IPv6 addresses held by the node 3000 are collected compared to the case of using the communication information detection apparatus 2000 of the third embodiment. .

[Embodiment 4]
FIG. 12 is a block diagram illustrating a communication information detection apparatus 2000 according to the fourth embodiment. Here, among the functional components shown in FIG. 12, the functional components shown in FIG. 1, FIG. 6, or FIG. 9 with the same reference numerals are the same as those in FIG. 1, FIG. 6, or FIG. It has the same function as the functional component of the code. In FIG. 12, each functional configuration unit indicates a functional unit configuration, not a hardware unit configuration.

<Address information acquisition unit 2020>
The address information acquisition unit 2020 acquires address information indicating the layer 2 address of the node 3000.

<Candidate address generation unit 2080>
The candidate address generation unit 2080 generates a candidate address using the network prefix acquired from the prefix information storage unit 2060 and the candidate interface ID calculated by the candidate interface ID calculation unit 2040. Specifically, the candidate address generation unit 2080 uses the network prefix acquired from the prefix information storage unit 2060 as the network prefix of the candidate address. Further, the candidate address generation unit 2080 uses the candidate interface ID calculated by the candidate interface ID calculation unit 2040 as the interface ID of the candidate address.

  FIG. 13 is a diagram conceptually illustrating how the candidate address generation unit 2080 according to the fourth embodiment generates a candidate address. Here, in the example of FIG. 13, the prefix information indicates three network prefixes 2001: 0db8: 0101: 0001, 2001: 0db8: 0234: 0101, and 2001: 0db8: ffff: 0132. The address information indicates a layer 2 address of XX: XX: XX: XX: XX: XX. Then, the candidate interface ID calculation unit 2040 converts the layer 2 address indicated by the address information by a predetermined method, and generates a candidate interface ID of 0000: 0000: 0000: 000B.

  Therefore, the candidate address generation unit 2080 uses 2001: 0db8: 0101: 0001, which is one of the network prefixes indicated by the prefix information, as the network prefix of the candidate address. Further, the candidate address generation unit 2080 uses 0000: 0000: 0000: 000B that is a candidate interface ID as the interface ID of the candidate address. As a result, the candidate address generation unit 2080 generates an IPv6 address of 2001: 0db8: 0101: 0001: 0000: 0000: 0000: 000B as the candidate address.

<Flow of communication information detection process>
FIG. 14 is a flowchart illustrating a flow of communication information detection processing by the communication information detection apparatus 2000 according to the fourth embodiment.

  In step S402, the address information acquisition unit 2020 acquires the address information of the node 3000.

  In step S404, the candidate interface ID calculation unit 2040 calculates a candidate interface ID from the layer 2 address indicated by the address information.

  In step S406, the candidate address generation unit 2080 obtains a network prefix from the prefix information storage unit 2060.

  In step S408, the candidate address generation unit 2080 generates a candidate address using the network prefix acquired from the prefix information storage unit 2060 and the candidate interface ID calculated by the candidate interface ID calculation unit 2040.

  In step S410, the address confirmation unit 2100 confirms whether the candidate address is held by the node 3000.

  Here, it is assumed that the prefix information storage unit 2060 stores a plurality of network prefixes. In this case, the candidate address generation unit 2080 may generate a candidate address for one network prefix, or may generate a candidate address for each of a plurality of network prefixes. When the candidate address generation unit 2080 generates a plurality of candidate addresses, the address confirmation unit 2100 confirms whether or not the candidate address is held by the node 3000 for each of the generated candidate addresses.

<Action and effect>
The communication information detection apparatus 2000 uses the known network prefix and the IPv6 address of the node 3000 indicated by the address information to associatively generate an IPv6 address that is assumed to be held by the node 3000. Here, since the communication information detection apparatus 2000 and the node 3000 are communicably connected, the node 3000 is highly likely to belong to a subnetwork known by the communication information detection apparatus 2000. In many cases, there is a relation between the IPv6 address held by the node 3000 and the layer 2 address held by the node 3000. Therefore, in consideration of the characteristics of these IPv6 addresses, the communication information detection apparatus 2000 is presumed to be held by the node 3000 from two known information, that is, a known network prefix and a layer 2 address of the node 3000. An IPv6 address is generated associatively. As a result, IPv6 addresses held by the node 3000 are collected in a short time.

<Modification 4-1>
The candidate address generation unit 2080 has a function of further generating candidate addresses by the same method as any one or more of the candidate address generation unit 2080 of the second embodiment and the candidate address generation unit 2080 of the third embodiment. Also good. The communication information detection apparatus 2000 in this case is referred to as a communication information detection apparatus 2000 according to Modification 4-1. In the communication information detection apparatus 2000 of the modification 4-1, the address information acquired by the address information acquisition unit 2020 further indicates the IPv6 address of the node 3000.

<Action and effect>
By using the communication information detection apparatus 2000 of the modified example 4-1, more IPv6 addresses held by the node 3000 are collected as compared to the case of using the communication information detection apparatus 2000 of the fourth embodiment. .

[Embodiment 5]
FIG. 15 is a block diagram illustrating a communication information detection apparatus 2000 according to the fifth embodiment. Here, among the functional components shown in FIG. 15, the functional components shown in FIG. 1, FIG. 6, FIG. 9, or FIG. Or, it has the same function as the functional component having the same reference numeral in FIG. In FIG. 15, each functional configuration unit indicates a functional unit configuration, not a hardware unit configuration.

<Address information acquisition unit 2020>
The address information acquired by the address information acquisition unit 2020 indicates the layer 2 address of the node 3000 and the IPv6 address of the node 3000.

<Determining unit 2120>
The communication information detection apparatus 2000 according to the fifth embodiment further includes a determination unit 2120. The determination unit 2120 determines whether the interface ID of the IPv6 address indicated by the address information matches the candidate interface ID calculated by the candidate interface ID calculation unit 2040.

<Candidate address generation unit 2080>
The processing performed by the candidate address generation unit 2080 differs depending on the determination result of the determination unit 2120. Assume that the determination unit 2120 determines that the interface ID of the IPv6 address indicated by the address information matches the candidate network ID calculated by the candidate interface ID calculation unit 2040. In this case, the candidate address generation unit 2080 generates a candidate address by the same method as the candidate address generation unit 2080 of the second embodiment.

  On the other hand, it is assumed that the determination unit 2120 determines that the interface ID of the IPv6 address indicated by the address information does not match the candidate network ID calculated by the candidate interface ID calculation unit 2040. In this case, the candidate address generation unit 2080 generates a candidate address by the same method as the candidate address generation unit 2080 of the third embodiment.

<Flow of communication information detection process>
FIG. 16 is a flowchart illustrating a flow of communication information detection processing by the communication information detection apparatus 2000 according to the fifth embodiment.

  In step S502, the address information acquisition unit 2020 acquires the address information of the node 3000.

  In step S504, the candidate interface ID calculation unit 2040 calculates a candidate interface ID from the layer 2 address indicated by the address information.

  In step S506, the determination unit 2120 determines whether the interface ID of the IPv6 address indicated by the address information matches the candidate network ID calculated in step S504. If the interface ID of the IPv6 address indicated by the address information matches the candidate network ID calculated in step S504, the communication information detection process proceeds to step S508. On the other hand, when the interface ID of the IPv6 address indicated by the address information does not match the candidate network ID calculated in step S504, the communication information detection process proceeds to step S512.

  In step S508, the candidate address generation unit 2080 acquires a network prefix from the prefix information storage unit 2060.

  In step S510, the candidate address generation unit 2080 generates a candidate address using the network prefix acquired from the prefix information storage unit 2060 and the interface ID of the IPv6 address indicated by the address information.

  In step S512, the candidate address generation unit 2080 generates a candidate address using the network prefix of the IPv6 address indicated by the address information and the candidate interface ID generated in step S504.

  In step S 514, the address confirmation unit 2100 confirms whether the candidate address is held by the node 3000.

<Action and effect>
With the above configuration, the communication information detection device 2000 generates candidate addresses using different methods based on the determination result of the determination unit 2120. By doing so, the communication information detection apparatus 2000 confirms whether or not the candidate address held by the node 3000 has a high probability, the node 3000 holds the candidate address. Therefore, by using the communication information detection apparatus 2000 of the third embodiment, the IPv6 address held by the node 3000 can be grasped in a shorter time.

<Modification 5-1>
When the determination unit 2120 determines that the interface ID of the IPv6 address indicated by the address information does not match the candidate network ID calculated from the layer 2 address indicated by the address information, the candidate address generation unit 2080 Candidate addresses may be further generated by the same method as the candidate address generation unit 2080. The communication information detection apparatus 2000 in this case is referred to as a communication information detection apparatus 2000 of Modification 5-1.

<Action and effect>
By using the communication information detection apparatus 2000 of the modified example 5-1, more IPv6 addresses held by the node 3000 are collected compared to the case of using the communication information detection apparatus 2000 of the fifth embodiment. .

  As mentioned above, although embodiment and modification of this invention were described with reference to drawings, these are illustrations of this invention, the combination of the said embodiment and modification, and various structures other than the said embodiment and modification Can also be adopted.

Hereinafter, examples of the reference form will be added.
1. Address information acquisition means for acquiring address information indicating any one or more of an IPv6 address or a layer 2 address held by a node holding an IPv6 address and a layer 2 address;
Candidate address generation means for generating a candidate address that is an IPv6 address not indicated in the address information and is an IPv6 address presumed to be held by the node based on the address information;
Address confirmation means for confirming whether the candidate address is held by the node;
A communication information detecting apparatus having
2. The address information indicates an IPv6 address of the node;
Prefix information storage means for storing prefix information including a network prefix that is a known network prefix and is different from the network prefix of the IPv6 address indicated by the address information;
The candidate address generating means generates a candidate address in which the network prefix is a network prefix acquired from the prefix information storage means, and the interface ID is an interface ID of an IPv6 address indicated by the address information;
And features 1. The communication information detection device according to 1.
3. The address information indicates an IPv6 address of the node and a layer 2 address of the node;
A candidate interface ID calculating means for converting a layer 2 address indicated by the address information by a predetermined method and calculating a candidate interface ID;
The candidate address generating means generates the candidate address, wherein the network prefix is a network prefix of the IPv6 address indicated by the address information, and the interface ID is the candidate interface ID;
Characterized by Or 2. The communication information detection device according to 1.
4). The address information indicates a layer 2 address of the node;
Prefix information storage means for storing prefix information including a network prefix that is a known network prefix and is different from the network prefix of the IPv6 address indicated by the address information;
A candidate interface ID calculating means for converting a layer 2 address indicated by the address information by a predetermined method and calculating a candidate interface ID;
Have
The candidate address generating means generates the candidate address in which a network prefix is a network prefix acquired from the prefix information storage means, and an interface ID is the candidate interface ID;
Characterized by To 3. The communication information detection apparatus according to any one of the above.
5. The address information indicates an IPv6 address of the node and a layer 2 address of the node;
Prefix information storage means for storing prefix information including a network prefix that is a known network prefix and is different from the network prefix of the IPv6 address indicated by the address information;
A candidate interface ID calculating means for converting a layer 2 address indicated by the address information by a predetermined method and calculating a candidate interface ID;
A determination unit that determines whether an interface ID of an IPv6 address indicated by the address information matches the candidate interface ID calculated from a layer 2 address indicated by the address information;
The candidate address generation means includes
When the determination unit determines that the interface ID of the IPv6 address indicated by the address information matches the candidate interface ID calculated from the layer 2 address indicated by the address information, a network prefix is stored in the prefix information storage unit. And generating the candidate address whose interface ID is the interface ID of the IPv6 address indicated by the address information,
When the determination unit determines that the interface ID of the IPv6 address indicated by the address information does not match the candidate interface ID calculated from the layer 2 address indicated by the address information, the network prefix indicates that the address information indicates Generating the candidate address, which is a network prefix of the indicated IPv6 address and whose interface ID is the candidate interface ID;
Characterized by The communication information detection device according to 1.
6). The candidate address generating means, when the determining means determines that the interface ID of the IPv6 address indicated by the address information does not match the candidate interface ID calculated from the layer 2 address indicated by the address information, 4. An IPv6 address whose prefix is a network prefix acquired from the prefix information storage unit and whose interface ID is the candidate interface ID is further generated as the candidate address. The communication information detection device according to 1.
7). Address information storage means for storing the address information;
The address confirmation means stores the candidate address confirmed as an IPv6 address held by the node as an IPv6 address held by the node in the address information storage means. 1. Add to the address information To 6. The communication information detection apparatus according to any one of the above.
8). A program for causing a computer to function as a communication information detecting device,
An address information acquisition function for acquiring address information indicating any one or more of an IPv6 address or a layer 2 address held by a node holding an IPv6 address and a layer 2 address;
A candidate address generation function for generating a candidate address that is an IPv6 address not indicated in the address information and is an IPv6 address presumed to be held by the node based on the address information;
An address confirmation function for confirming whether the candidate address is held by the node;
A program to give
9. 8). The program described in
The address information indicates an IPv6 address of the node;
The computer has a prefix information storage function for storing prefix information including a network prefix that is a known network prefix and is different from the network prefix of the IPv6 address indicated by the address information,
The candidate address generation function generates a candidate address in which a network prefix is a network prefix acquired from the prefix information storage function, and an interface ID is an interface ID of an IPv6 address indicated by the address information;
A program characterized by
10. 8). Or 9. The program described in
The address information indicates an IPv6 address of the node and a layer 2 address of the node;
The computer is provided with a candidate interface ID calculation function for converting a layer 2 address indicated by the address information by a predetermined method and calculating a candidate interface ID,
The candidate address generation function generates the candidate address in which a network prefix is a network prefix of an IPv6 address indicated by the address information, and an interface ID is the candidate interface ID.
A program characterized by
11. 8). To 10. A program according to any one of the following:
The address information indicates a layer 2 address of the node;
In the computer,
A prefix information storage function for storing prefix information including a network prefix that is a known network prefix and is different from the network prefix of the IPv6 address indicated by the address information;
A candidate interface ID calculation function for converting a layer 2 address indicated by the address information by a predetermined method and calculating a candidate interface ID;
Hold
The candidate address generation function generates the candidate address in which a network prefix is a network prefix acquired from the prefix information storage function, and an interface ID is the candidate interface ID.
A program characterized by
12 8). The program described in
The address information indicates an IPv6 address of the node and a layer 2 address of the node;
In the computer,
A prefix information storage function for storing prefix information including a network prefix that is a known network prefix and is different from the network prefix of the IPv6 address indicated by the address information;
A candidate interface ID calculation function for converting a layer 2 address indicated by the address information by a predetermined method and calculating a candidate interface ID;
A determination function for determining whether an interface ID of an IPv6 address indicated by the address information matches the candidate interface ID calculated from a layer 2 address indicated by the address information;
The candidate address generation function is:
When the determination function determines that the interface ID of the IPv6 address indicated by the address information matches the candidate interface ID calculated from the layer 2 address indicated by the address information, a network prefix is stored in the prefix information storage function. And generating the candidate address whose interface ID is the interface ID of the IPv6 address indicated by the address information,
When the determination function determines that the interface ID of the IPv6 address indicated by the address information does not match the candidate interface ID calculated from the layer 2 address indicated by the address information, the network prefix indicates that the address information is Generating the candidate address, which is a network prefix of the indicated IPv6 address and whose interface ID is the candidate interface ID;
A program characterized by
13. When the candidate address generation function determines that the interface ID of the IPv6 address indicated by the address information does not match the candidate interface ID calculated from the layer 2 address indicated by the address information by the determination function, 11. An IPv6 address whose prefix is a network prefix acquired from the prefix information storage function and whose interface ID is the candidate interface ID is further generated as the candidate address. The program described in.
14 An address information storage function for storing the address information;
The address confirmation function stores the address of the node stored by the address information storage function as the IPv6 address held by the node, with the candidate address confirmed as an IPv6 address held by the node. Add to information To 12. The program as described in any one.
15. A communication information detection method executed by a computer,
An address information acquisition step of acquiring address information indicating any one or more of an IPv6 address and a layer 2 address held by a node holding an IPv6 address and a layer 2 address;
A candidate address generation step of generating a candidate address that is an IPv6 address not indicated in the address information and is an IPv6 address presumed to be held by the node based on the address information;
An address confirmation step for confirming whether the candidate address is held by the node;
A communication information detection method comprising:
16. 15. The communication information detection method according to claim 1,
The address information indicates an IPv6 address of the node;
A prefix information storing step of storing prefix information including a network prefix that is a known network prefix and is different from the network prefix of the IPv6 address indicated by the address information;
The candidate address generating step generates a candidate address in which the network prefix is a network prefix acquired from the prefix information storing step, and the interface ID is an interface ID of an IPv6 address indicated by the address information;
A communication information detecting method.
17. 15. Or 16. The communication information detection method according to claim 1,
The address information indicates an IPv6 address of the node and a layer 2 address of the node;
A candidate interface ID calculating step of converting a layer 2 address indicated by the address information by a predetermined method and calculating a candidate interface ID;
In the candidate address generation step, the computer generates the candidate address in which a network prefix is a network prefix of an IPv6 address indicated by the address information, and an interface ID is the candidate interface ID.
A communication information detecting method.
18. 15. To 17. A communication information detection method according to any one of the above,
The address information indicates a layer 2 address of the node;
A prefix information storing step for storing prefix information including a network prefix that is a known network prefix and is different from the network prefix of the IPv6 address indicated by the address information;
A candidate interface ID calculating step of converting a layer 2 address indicated by the address information by a predetermined method and calculating a candidate interface ID;
Have
The candidate address generating step includes generating the candidate address in which the computer has a network prefix acquired from the prefix information storing step and an interface ID is the candidate interface ID;
A communication information detecting method.
19. 15. The communication information detection method according to claim 1,
The address information indicates an IPv6 address of the node and a layer 2 address of the node;
A prefix information storing step for storing prefix information including a network prefix that is a known network prefix and is different from the network prefix of the IPv6 address indicated by the address information;
A candidate interface ID calculating step of converting a layer 2 address indicated by the address information by a predetermined method and calculating a candidate interface ID;
A determination step of determining whether an interface ID of an IPv6 address indicated by the address information matches the candidate interface ID calculated from a layer 2 address indicated by the address information;
Have
The candidate address generation step includes:
When the determination step determines that the interface ID of the IPv6 address indicated by the address information matches the candidate interface ID calculated from the layer 2 address indicated by the address information, a network prefix is stored in the prefix information storage step. And generating the candidate address whose interface ID is the interface ID of the IPv6 address indicated by the address information,
When the determination step determines that the interface ID of the IPv6 address indicated by the address information does not match the candidate interface ID calculated from the layer 2 address indicated by the address information, the network prefix indicates that the address information indicates Generating the candidate address, which is a network prefix of the indicated IPv6 address and whose interface ID is the candidate interface ID;
A communication information detecting method.
20. In the candidate address generation step, when it is determined by the determination step that the interface ID of the IPv6 address indicated by the address information does not match the candidate interface ID calculated from the layer 2 address indicated by the address information, 18. An IPv6 address whose prefix is the network prefix acquired from the prefix information storage step and whose interface ID is the candidate interface ID is further generated as the candidate address. The communication information detection method described in 1.
21. An address information storing step for storing the address information;
In the address confirmation step, the candidate address confirmed by the computer as an IPv6 address held by the node is set as an IPv6 address held by the node, and the node information stored in the address information step is stored. 15. Add to the address information To 20. The communication information detection method according to any one of the above.

1020 Bus 1040 CPU
1060 RAM
1080 Storage 1100 Network interface 1220 Address information acquisition module 1260 Candidate address generation module 1280 Address confirmation module 2000 Communication information detection device 2020 Address information acquisition unit 2040 Interface ID calculation unit 2060 Prefix information storage unit 2080 Candidate address generation unit 2100 Address confirmation unit 2120 Part 2140 address information storage part 3000 node 4000 network

Claims (10)

Address information acquisition means for acquiring address information indicating both the IPv6 address and the layer 2 address held by the node holding the IPv6 address and the layer 2 address;
Candidate address generation means for generating a candidate address that is an IPv6 address not indicated in the address information and is an IPv6 address presumed to be held by the node based on the address information;
Address confirmation means for confirming whether the candidate address is held by the node;
A candidate interface ID calculating means for converting a layer 2 address indicated by the address information by a predetermined method and calculating a candidate interface ID;
I have a,
The candidate address generating means generates the candidate address, wherein the network prefix is a network prefix of an IPv6 address indicated by the address information, and the interface ID is the candidate interface ID . A network prefix already known, and has a prefix information storage means for storing prefix information including a different network prefix and IPv6 address of the network prefix that indicates the address information,
The candidate address generation means further generates a candidate address in which the network prefix is a network prefix acquired from the prefix information storage means, and the interface ID is an interface ID of an IPv6 address indicated by the address information;
The communication information detecting apparatus according to claim 1. Includes a prefix information storage means for storing prefix information including a network prefix already known, a,
The candidate address generation means further generates the candidate address, wherein the network prefix is a network prefix acquired from the prefix information storage means, and the interface ID is the candidate interface ID;
Claim 1 Symbol placement of the communication information detecting apparatus characterized by. Address information acquisition means for acquiring address information indicating both the IPv6 address and the layer 2 address held by the node holding the IPv6 address and the layer 2 address;
Candidate address generation means for generating a candidate address that is an IPv6 address not indicated in the address information and is an IPv6 address presumed to be held by the node based on the address information;
Address confirmation means for confirming whether the candidate address is held by the node;
Prefix information storage means for storing prefix information including a network prefix that is a known network prefix and is different from the network prefix of the IPv6 address indicated by the address information;
A candidate interface ID calculating means for converting a layer 2 address indicated by the address information by a predetermined method and calculating a candidate interface ID;
Interface ID of the IPv6 address which the address information is indicated, possess a determination unit configured to determine whether coincident with said candidate interface ID which is calculated from the layer 2 addresses the address information indicates, and
The candidate address generation means includes
When the determination unit determines that the interface ID of the IPv6 address indicated by the address information matches the candidate interface ID calculated from the layer 2 address indicated by the address information, a network prefix is stored in the prefix information storage unit. And generating the candidate address whose interface ID is the interface ID of the IPv6 address indicated by the address information,
When the determination unit determines that the interface ID of the IPv6 address indicated by the address information does not match the candidate interface ID calculated from the layer 2 address indicated by the address information, the network prefix indicates that the address information indicates Generating the candidate address, which is a network prefix of the indicated IPv6 address and whose interface ID is the candidate interface ID;
Communication information detecting device you characterized. The candidate address generating means, when the determining means determines that the interface ID of the IPv6 address indicated by the address information does not match the candidate interface ID calculated from the layer 2 address indicated by the address information, 5. The communication information detection according to claim 4 , wherein an IPv6 address whose prefix is a network prefix acquired from the prefix information storage unit and whose interface ID is the candidate interface ID is further generated as the candidate address. apparatus. Address information storage means for storing the address information;
The address confirmation means stores the candidate address confirmed as an IPv6 address held by the node as an IPv6 address held by the node in the address information storage means. communication information detecting apparatus according to claim 1 to 5 any one adds to the address information. A program for causing a computer to function as a communication information detecting device,
An address information acquisition function for acquiring address information indicating both the IPv6 address and the layer 2 address held by the node holding the IPv6 address and the layer 2 address;
A candidate address generation function for generating a candidate address that is an IPv6 address not indicated in the address information and is an IPv6 address presumed to be held by the node based on the address information;
An address confirmation function for confirming whether the candidate address is held by the node;
A candidate interface ID calculation function for converting a layer 2 address indicated by the address information by a predetermined method and calculating a candidate interface ID;
It was given,
The candidate address generation function generates the candidate address in which a network prefix is a network prefix of an IPv6 address indicated by the address information, and an interface ID is the candidate interface ID . A communication information detection method executed by a computer,
An address information acquisition step of acquiring address information indicating both the IPv6 address and the layer 2 address held by the node holding the IPv6 address and the layer 2 address;
A candidate address generation step of generating a candidate address that is an IPv6 address not indicated in the address information and is an IPv6 address presumed to be held by the node based on the address information;
An address confirmation step for confirming whether the candidate address is held by the node;
A candidate interface ID calculating step of converting a layer 2 address indicated by the address information by a predetermined method and calculating a candidate interface ID;
I have a,
The communication information detecting method, wherein, in the candidate address generating step, the candidate address is generated in which a network prefix is a network prefix of an IPv6 address indicated by the address information and an interface ID is the candidate interface ID .   A program for causing a computer to function as a communication information detecting device,
    An address information acquisition function for acquiring address information indicating both the IPv6 address and the layer 2 address held by the node holding the IPv6 address and the layer 2 address;
    A candidate address generation function for generating a candidate address that is an IPv6 address not indicated in the address information and is an IPv6 address presumed to be held by the node based on the address information;
    An address confirmation function for confirming whether the candidate address is held by the node;
    A candidate interface ID calculation function for converting a layer 2 address indicated by the address information by a predetermined method and calculating a candidate interface ID;
    A determination function for determining whether an interface ID of an IPv6 address indicated by the address information matches the candidate interface ID calculated from a layer 2 address indicated by the address information;
  The computer has prefix information storage means for storing prefix information including a network prefix that is a known network prefix and that is different from the network prefix of the IPv6 address indicated by the address information,
  The candidate address generation function is:
    When the determination function determines that the interface ID of the IPv6 address indicated by the address information matches the candidate interface ID calculated from the layer 2 address indicated by the address information, a network prefix is stored in the prefix information storage unit. And generating the candidate address whose interface ID is the interface ID of the IPv6 address indicated by the address information,
    When the determination function determines that the interface ID of the IPv6 address indicated by the address information does not match the candidate interface ID calculated from the layer 2 address indicated by the address information, the network prefix indicates that the address information is A program characterized by generating the candidate address whose network ID is the IPv6 address shown and whose interface ID is the candidate interface ID.   A communication information detection method executed by a computer,
  An address information acquisition step of acquiring address information indicating both the IPv6 address and the layer 2 address held by the node holding the IPv6 address and the layer 2 address;
  A candidate address generation step of generating a candidate address that is an IPv6 address not indicated in the address information and is an IPv6 address presumed to be held by the node based on the address information;
  An address confirmation step for confirming whether the candidate address is held by the node;
  A candidate interface ID calculating step of converting a layer 2 address indicated by the address information by a predetermined method and calculating a candidate interface ID;
  Determining whether the interface ID of the IPv6 address indicated by the address information matches the candidate interface ID calculated from the layer 2 address indicated by the address information;
  The computer has prefix information storage means for storing prefix information including a network prefix that is a known network prefix and that is different from the network prefix of the IPv6 address indicated by the address information,
  In the candidate address generation step,
    In the determination step, when it is determined that the interface ID of the IPv6 address indicated by the address information matches the candidate interface ID calculated from the layer 2 address indicated by the address information, a network prefix is stored in the prefix information storage unit. And generating the candidate address whose interface ID is the interface ID of the IPv6 address indicated by the address information,
    In the determination step, when it is determined that the interface ID of the IPv6 address indicated by the address information does not match the candidate interface ID calculated from the layer 2 address indicated by the address information, the network prefix indicates that the address information indicates A communication information detection method, comprising: generating a candidate address whose network ID is an IPv6 address and whose interface ID is the candidate interface ID.

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