JP2006237867A - Domain name providing apparatus, domain name management server, and domain name management system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a domain name providing apparatus for providing a domain name to a local communication apparatus, a domain name management server for managing the provided domain name and carrying out a name resolution, and a domain name management system using them. <P>SOLUTION: The domain name providing apparatus 1-A includes: a communication interface 13 connected to a transmission path of a local area network (LAN) and carrying out communication; a detection section 111 for detecting the local communication apparatus; a domain name provision section 112 for providing a domain name to the detected local communication apparatus; and a domain name registration section 113-A for managing a communication address of a router apparatus between the LAN and an external network, and the domain name and its communication address of the local communication apparatus in cross-reference with each other, and transmitting a communication signal for including the domain name and the communication address of the local communication apparatus to which the domain name is imparted to the domain name management server for carrying out the name resolution via the router apparatus. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a domain name assigning device that assigns a domain name to a local communication device in a local area network. The present invention also relates to a domain name management server that manages the domain name of the local communication device assigned by the domain name assigning device in association with the address of the local communication device. Furthermore, the present invention relates to a domain name management system including these domain name assigning device and domain name management server.

  In recent years, with the development of communication technology and the like, various devices are equipped with communication functions, and these devices are communicably connected to each other, so that these devices are abbreviated as “LAN”. To make up.) Here, a device having such a communication function in the LAN is referred to as a “local communication device”. Examples of the local communication device include a personal computer (hereinafter abbreviated as “PC”), a web camera (PC camera), an internet home appliance, and a residential device such as a lighting device or an electric lock, a security sensor, a disaster prevention sensor, or the like. Home security terminal.

  In such a LAN, in order to effectively use communication address resources, a private address (local address) that is normally used only in the LAN is assigned to each local communication device as a communication address (network address).

  For communication, it is necessary to use a communication address. For example, an IP address of version 4 is a notation in which numerical values such as 192.168.0.150 are listed, for example, and it is difficult for a person to become familiar with and remember. Hateful. Therefore, in the so-called Internet, by providing a DNS (Domain Name System) server that manages the correspondence between domain names and IP addresses and converts the domain name to an IP address according to the inquiry and returns the IP address. Communication using domain names that are familiar to humans and easy to remember is possible.

Therefore, if a DNS server is provided in the LAN and a domain name can be used in the LAN, the convenience is improved. However, in a home LAN or the like, there are only a few local communication devices. In such a case, the DNS server is used. The management load is high. As the solution, for example, a technique shown in Patent Document 1 can be cited. In this Patent Document 1, a host name (for example, “xxxx-digitalname-a20-dpro-1234”) composed of a plurality of character strings separated by a separator character (for example, “-” (hyphen)) is provided before product shipment. When communication is performed in advance and stored in the device a, the device a first generates an NI (Node Information) group address as a multicast address from an arbitrary combination of character strings constituting the host name. Next, the device a transmits an NI (Node Information) Query packet including the subject name (host name) to the LAN with the NI group address. Another device b in the LAN stores a host name having the same configuration in advance, generates an NI group address from an arbitrary combination of character strings constituting the host name, and receives an NI Query packet. When the NI group address of the received NI Query packet matches the NI group address generated by the own apparatus b, an NI Reply packet is returned to the NI Query packet. For this reason, the device a can receive the NI Reply packet including the host name as a reply to the NI Query packet from the other device b, and the host name and communication of the other device b from the received NI Reply packet. You can know the address. Therefore, thereafter, communication can be performed using the host name.
JP 2004-88428 A

  By the way, in the technique disclosed in Patent Document 1, the local communication device stores in advance a host name consisting of a plurality of character strings separated by separator characters before shipping the product, and performs the above-described procedure (protocol). It is necessary to have the functions to be realized. In other words, since the local communication device needs to implement the technology disclosed in Patent Document 1, the technology disclosed in Patent Document 1 connects a local communication device of an arbitrary specification to a LAN and domain name. Communication using cannot be performed.

  In recent years, a LAN often constitutes an intranet using a so-called Internet protocol group as a communication protocol, and many local communication devices operate on TCP / IP (Transmission Control Protocol / Internet Protocol). . Therefore, if such a local communication device operating on TCP / IP can be connected to the LAN and communicate using the domain name, the convenience for the user is improved.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a domain name assigning device that assigns a domain name to a local communication device so as to enable communication using a domain name. . It is another object of the present invention to provide a domain name management server that manages a domain name of a local communication device assigned by a domain name assigning device and a communication address of the local communication device in association with each other. Furthermore, it aims at providing the domain name management system provided with these domain name provision apparatuses and a domain name management server.

  To achieve the above object, according to one aspect of the present invention, a domain name assigning device for assigning a domain name to a local communication device connected to a transmission path of a local area network includes the local area A communication unit that is connected to a network transmission path and performs communication; a detection unit that detects the local communication device; a domain name assignment unit that assigns a domain name to the local communication device detected by the detection unit; and the local area A domain name for managing a communication address of a router device that is communicably connected between a network and an external network, a domain name of the local communication device, and a communication address of the local communication device in association with each other and performing name resolution To the management server, the domain name assigned by the domain name assigning unit and the local communication to which the domain name is assigned. A communication signal for accommodating the communication address of the device, characterized in that it comprises a domain name registration unit for transmitting via the router device.

  In the domain name assigning device described above, at a predetermined timing, the detection unit detects the local communication device, the domain name assignment unit assigns a domain name to the local communication device detected by the detection unit, and A domain name registration unit transmits the communication signal to the domain name management server via the router device.

  In these domain name assigning devices, the communication address is a global IP address.

  According to another aspect of the present invention, a domain name assigning device that assigns a domain name to a local communication device connected to a transmission path of a local area network and routes a communication signal is A first communication unit that communicates by being connected to a transmission path of an area network, a second communication unit that is communicably connected to an external network, a detection unit that detects the local communication device, and the detection unit A domain name assigning unit that assigns a domain name to the local communication device detected in step 1, a port number assigning unit that assigns a port number to the local communication device detected by the detection unit, the domain name of the own device, and the IP address of the own device And the domain name of the local communication device assigned by the domain name assigning unit and the port number associated with the domain name A storage unit for storing the port number of the local communication device assigned by the giving unit, a domain name of the domain name assigning device and an IP address are managed in association with each other, and the domain name of the domain name assigning device and the domain of the local communication device A domain name management server that manages the name and the port number of the local communication device in association with each other and performs name resolution, the domain name of the own device stored in the storage unit, the domain name of the local communication device, and A domain name registration unit that transmits a communication signal that accommodates the port number of the local communication device using the transmission source communication address as its own IP address, and a communication signal transmitted from the local area network to the network. Is the transmission port number of the communication signal stored in the storage unit based on the storage contents of the storage unit? Rewrite the port number of the local communication device corresponding to the transmission source IP address and rewrite the transmission source IP address of the communication signal to the IP address of its own device, and communicate from the network to the local area network When transmitting a signal, based on the storage contents of the storage unit, rewrite the transmission destination IP address of the communication signal with the IP address of the local communication device corresponding to the transmission destination port number of the communication signal and And a network address / port conversion unit that transmits the communication signal after rewriting the transmission destination port number of the communication signal to the original transmission source port number stored in the storage unit.

  In addition, a domain name management server according to another aspect of the present invention includes a communication unit that is connected to a transmission path of a network and performs communication, and a router device that connects the local area network and the network so that communication is possible. A database unit that manages the communication address of the local communication device, the communication address of the local communication device connected to the transmission path of the local area network, and the domain name of the local communication device, and the local communication device When a communication signal accommodating a domain name and a communication address of the local communication device is received via the router device, the communication address of the router device accommodated as a transmission source communication address in the received communication signal; The domain name of the local communication device accommodated in the received communication signal and the local communication A registration unit that associates a communication address of a device with the database unit and registers it in the database unit; and a name resolution unit that performs name resolution by referring to the database unit when a name resolution request is received from the router device. It is characterized by.

  Furthermore, according to another aspect of the present invention, a router device for communicably connecting a local area network and an external network, and a local communication device connected to a transmission path of the local area network A domain name assigning device that assigns a domain name to the local communication device, a communication address of the router device, a domain name of the local communication device, and a communication address of the local communication device in association with each other, and a domain name A domain name management system including a domain name management server that performs resolution is characterized in that the domain name assigning device is the domain name assigning device described above.

  The domain name assigning device having such a configuration can register the communication address of the router device, the domain name of the local communication device, and the communication address of the local communication device in association with each other in the domain name management server. Therefore, the user can communicate from one local communication device to another local communication device using the domain name.

Embodiments according to the present invention will be described below with reference to the drawings. In addition, the structure which attached | subjected the same code | symbol in each figure shows that it is the same structure, The description is abbreviate | omitted.
(Configuration of the first embodiment)
FIG. 1 is a diagram showing a configuration of a domain name management system according to the first embodiment. FIG. 2 is a diagram illustrating the configuration of the domain name assigning apparatus and the configuration of the domain name assigning information according to the first embodiment. FIG. 2A is a block diagram showing the configuration of the domain name assigning apparatus, and FIG. 2B is a diagram showing the configuration of the domain name assigning information. FIG. 3 is a diagram showing the configuration of the domain name management server and the configuration of the domain name database. FIG. 3A is a block diagram showing the configuration of the domain name management server, and FIG. 3B is a diagram showing the configuration of the domain name database according to the first embodiment.

  In FIG. 1, a domain name management system DMS-A includes a domain name assigning device 1-A, a domain name management server 2-A, and one or a plurality of local communication devices 3. 1-A and domain name management server 2-A are connected to each other via a router device 4 and an external network 6 so that they can communicate with each other, and domain name assigning device 1-A, local communication device 3, router device 4 Are communicably connected to each other via a wireless or wired transmission path 5. In the example shown in FIG. 1, two local communication devices 3-1 and 3-2 are shown, but the number thereof may be arbitrary. The domain name assigning device 1-A, the local communication device 3, the router device 4, and the transmission path 5 constitute a local area network (LAN), and these are arranged in a home, for example. In the present specification, when referring generically, it is indicated by a reference symbol without a suffix, and when referring to an individual configuration, it is indicated by a reference symbol with a suffix.

  The domain name assigning device 1-A is a device that assigns a domain name to the local communication device 3 connected to the LAN transmission path 5 in accordance with a predetermined rule. For example, as shown in FIG. A processing unit 11-A, a storage unit 12-A, a communication interface unit 13, and a bus 14 are provided.

  The communication interface unit 13 is a circuit that is connected to the LAN transmission line 5 and performs communication. The communication interface unit 13 generates a communication signal according to the LAN communication protocol based on data from the central processing unit 11-A and performs communication from the LAN. The signal is converted into data in a format that can be processed by the central processing unit 11-A. LAN communication protocols include, for example, so-called Internet protocol groups such as HTTP (Hyper Text Transfer Protocol), FTP (File Transfer Protocol), SMTP (Simple Mail Transfer Protocol), POP3 (Post Office Protocol ver. 3), and TCP / IP. The LAN constitutes an intranet. The communication interface unit 13 is a network card such as an Ethernet (registered trademark) card, for example. The LAN transmission path 5 is a wired medium such as 10BASE-T or a wireless medium such as infrared rays or radio waves.

  The storage unit 12-A includes an IP address information storage unit 121 that stores IP address information, a domain name candidate information storage unit 122 that stores domain name candidate information, and a domain name assignment storage unit 123 that stores domain name assignment information. Various programs such as a domain name assigning program that assigns a domain name to the local communication device 3 and transmits the assigned domain name and IP address to the domain name management server 2-A via the router device 4; Various data such as data necessary for execution of various programs and data generated during the execution are stored. The storage unit 12-A is, for example, a volatile storage element such as a RAM (Random Access Memory) serving as a so-called working memory of the central processing unit 11-A, a ROM (Read Only Memory), or a rewritable EEPROM (Electrically Erasable Programmable). A non-volatile storage element such as a Read Only Memory) is provided.

  The IP address information is the IP address of the communication device in the LAN, that is, the IP address of the own device 1-A, the IP address of the router device 4, and the IP address of the local communication device 3, and the IP address of the own device 1-A. The IP address of the local communication device 3 is assigned by, for example, a DHCP (Dynamic Host Configuration Protocol) function of the router device 4. The DHCP function is a function for dynamically allocating an IP address when starting a client (in this embodiment, the domain name assigning apparatus 1-A or the local communication device 3) and collecting the IP address when the client ends. The IP address of the local communication device 3 can be acquired by using, for example, an information reply message of ICMP (Internet Control Message Protocol).

  The domain name candidate information is information related to the domain name to be assigned to the local communication device 3. In this embodiment, the domain name is assigned assuming the type of application software from the port number. This is information indicating a correspondence relationship with a domain name prepared in advance that can be associated with the type of application software that uses a number. For example, the port number; “25” is associated with the domain name; “Mailserver”. The domain name candidate information is distributed to users in the form of a list, for example, bundled with the domain name assigning apparatus 1-A.

  The domain name assignment information is information indicating a correspondence relationship between a domain name assigned to the local communication device 3 and an IP address of the local communication device 3 by an operation described later. The domain name assignment information is stored in a table format, for example, as shown in FIG. A domain name assignment table 301 shown in FIG. 2B includes a domain name registration unit 311 (311-1, 311-2,...) Of domain name assignment information for registering a domain name assigned to the local communication device 3. And an IP address registration unit 312 (312-1, 312-2,...) For domain name assignment information for registering the IP address of the local communication device 3 to which the domain name is assigned. For example, in the example shown in FIG. 2B, the domain name; “Webcam.xxxx.co.jp” 311-1 and the IP address; “192.168.0.50” 312-1 are in a correspondence relationship. The domain name; “PC.xxxx.co.jp” 311-2 and the IP address; “192.168.0.100” 312-2 are in a correspondence relationship.

  The central processing unit 11-A includes, for example, a microprocessor and its peripheral circuits, and functionally includes a detection unit 111, a domain name assigning unit 112, and a domain name registration unit 113-A. According to the control program, the storage unit 12-A and the communication interface unit 13 are controlled according to the function.

  The detection unit 111 detects the local communication device 3 by detecting a port number opened by the local communication device 3 by port scanning. The domain name assigning unit 112 assigns a domain name to the local communication device 3 detected by the detecting unit 111 based on the domain name candidate information, generates domain name assigning information based on the assigned domain name, and generates this The domain name assignment information is stored in the domain name assignment information storage unit 123 of the storage unit 12-A. The domain name registration unit 113-A receives a communication signal (first signal) that contains domain name assignment information indicating the correspondence between the domain name assigned by the domain name assignment unit 112 and the IP address of the local communication device 3 to which the domain name is assigned. 1 domain name notification signal) is transmitted via the router device 4 and the network 6 to the domain name management server 2-A.

  The central processing unit 11-A, the storage unit 12-A, and the communication interface unit 13 are connected by a bus 14 so that data can be exchanged with each other.

  Returning to FIG. 1, the local communication device 3 is a device having a communication function that operates on TCP / IP. For example, a PC, a web camera, an Internet home appliance, and a lighting device having such a communication function. And home security terminals such as crime prevention sensors and disaster prevention sensors.

  The router device 4 performs communication signal routing (route selection) according to the routing table in which the route information is registered to connect the LAN and the external network 6 so that they can communicate with each other. A device that performs DHCP on communication terminals (nodes, hosts) such as A and the local communication device 3. The router device 4 includes, for example, a WAN side communication interface unit to which a global IP address for communication with the network 6 is assigned and a LAN side communication interface unit to which a private IP address for communication with the LAN is assigned. And a storage unit that stores various data such as a routing table and various programs such as a control program, and a central processing unit that performs routing, DHCP, and the like.

  The network 6 is a telephone network, a digital communication network, a wireless communication network, or the like. Data is transmitted to the network 6 using a predetermined communication protocol. For example, an Internet protocol group is used as the communication protocol, and the network 6 constitutes the Internet.

  The domain name management server 2-A manages information (first domain name management information) necessary for performing name resolution for the domain name of the local communication device 3, and from the local communication device 3 via the router device 4. This is a server computer that performs name resolution by converting a domain name into an IP address and returning an IP address in accordance with the inquiry. For example, as shown in FIG. 3A, the domain name management server 2-A includes a central processing unit 21-A, a communication interface unit 22, a domain name database unit 23-A, a storage unit 24, a bus, 25.

  The communication interface unit 22 is a circuit that is connected to the network 6 and performs communication. The communication interface unit 22 generates a communication signal according to the communication protocol of the network 6 based on data from the central processing unit 21-A and also transmits a communication signal from the network 6. Is converted into data in a format that can be processed by the central processing unit 21-A.

  The domain name database unit 23-A accumulates and manages the first domain name management information, and includes, for example, a hard disk that stores data having a relatively large capacity.

  In the present embodiment, the first domain name management information is an IP address of the local communication device 3, a domain name of the local communication device 3, and a router that connects the LAN and the network 6 of the local communication device 3 so that they can communicate with each other. This is information indicating a correspondence relationship with the IP address of the device 4. In this embodiment, by further associating the IP address of the router device 4 with the correspondence between the IP address of the local communication device 3 and the domain name of the local communication device 3, the router device 4 of the LAN including the local communication device 3 It is managed so that the correspondence can be understood.

  For example, as shown in FIG. 3B, the first domain name management information is stored and managed in a table format. The domain name management table 401 shown in FIG. 3B is a domain name registration unit 411 (411-11, 411-12,... 411) of first domain name management information for registering the domain name of the local communication device 3. -21, 411-22,...) And the IP address registration unit 412 (412-) of the first domain name management information that registers the IP address of the local communication device 3 associated with each domain name registration unit 411. 11, 412-12,..., 412-21, 412-22,. The domain name management table 401 is provided between a plurality of sets of the domain name registration unit 411 and the IP address registration unit 412 so that the correspondence relationship with the LAN router device 4 including the local communication device 3 can be understood. A router device IP address registration unit 413 (413-1, 413-2) for registering the IP address of the router device 4 in the LAN including the local communication device 3 is inserted and delimited.

  For example, in the example shown in FIG. 3B, the domain name of the local communication device 3; “Webcam.xxxx.co.jp” 411-11 and IP address; “192.168.0.50” 412-11 There is a correspondence relationship between the domain name of the local communication device 3; “PC.xxxx.co.jp” 411-12 and the IP address; “192.168.0.100” 412-12. The communication device 3 is in the LAN of the router device 4 whose IP address is “133.2544.30.52” 413-1. On the other hand, the domain name of the local communication device 3; “Webcam.xxxx.co.jp” 411-21 and the IP address; “192.168.0.10” 412-21 have a corresponding relationship. The domain name; “TV.xxxx.co.jp” 411-22 and the IP address; “192.168.0.20” 412-22 are in a correspondence relationship, and the IP address of these local communication devices 3 is “124. .254.64.38 "413-2 in the LAN of the router device 4.

  The storage unit 24 stores various programs such as a management program for managing the domain name database and a program for performing name resolution, and various data such as data necessary for execution of the various programs and data generated during the execution. The storage unit 24 is, for example, a volatile storage element such as a RAM (Random Access Memory) serving as a so-called working memory of the central processing unit 21-A, a ROM (Read Only Memory) or a rewritable EEPROM (Electrically Erasable Programmable Read Only). Non-volatile memory elements such as “Memory”.

  The central processing unit 21-A includes, for example, a microprocessor and its peripheral circuits, and functionally includes a domain name registration unit 211-A and a name resolution unit 212-A, and in accordance with a control program. The communication interface unit 22, the domain name database unit 23-A, and the storage unit 24 are controlled in accordance with the functions.

  When the domain name registration unit 211-A receives the first domain name notification signal, the domain name registration unit 211-A extracts the IP address of the router device 4 from the communication address of the transmission source in the received first domain name notification signal, and the first domain name notification signal The domain name and IP address of the local communication device 3 in the domain name assignment information accommodated in the domain name are taken out and registered in the domain name database unit 23-A. The name resolution unit 212-A converts the domain name into an IP address by referring to the first domain name management information of the domain name database unit 23-A according to the inquiry from the local communication device 3, and the converted IP address Reply.

  The central processing unit 21-A, communication interface unit 22, domain name database unit 23-A, and storage unit 24 are connected by a bus 25 so that data can be exchanged with each other.

Next, the operation of this embodiment will be described.
(Operation of the first embodiment)
FIG. 4 is a flowchart showing the operation of the domain name assigning apparatus according to the first embodiment. In FIG. 4, the domain name assignment program is started at a predetermined time interval. First, the detection unit 111 in the central processing unit 11 -A of the domain name assignment apparatus 1 -A performs local communication to detect the local communication device 3. A port scan for detecting a port number opened by the device 3 is performed (S11). As the port scan, there are various known methods such as a TCP connection scan, a TCP SYN scan, a TCP FIN scan, and a TCP ACK scan. The predetermined time interval is determined according to the frequency at which the local communication device 3 enters and leaves the LAN, for example. That is, if the frequency of entry / exit is high, the time interval is short, while if the frequency of entry / exit is low, the time interval is long.

  When there is a port scan response, the domain name assigning unit 112 in the central processing unit 11-A of the domain name assigning apparatus 1-A assigns and assigns a domain name to the local communication device 3 detected in process S11 (S12). ). More specifically, the domain name corresponding to the port number detected by the port scan is searched from the domain name candidate information stored in the domain name candidate information storage unit 122 of the storage unit 12-A, and the searched domain name Is assigned and assigned to the local communication device 3 detected in this process S11. Next, the domain name assigning unit 112 associates the domain name assigned in the process S12 with the IP address of the local communication device 3 and stores them in the domain name assignment information storage unit 123 of the storage unit 12-A (S13).

  Then, the central processing unit 11-A, for example, performs each process of the above-described processing S11 to S13 on the IP address stored in the IP address information storage unit 121 of the storage unit 12-A, thereby performing LAN processing. Each of the processes S11 to S13 is executed for all of the local communication devices 3 (S14).

  By operating in this way, the domain name assigning device 1-A assigns a domain name to all local communication devices 3 in the LAN, and the correspondence between the domain name and the IP address in each local communication device 3 Can be stored in the domain name assignment information storage unit 123 of the storage unit 12-A as domain name assignment information. And since the said process S11 thru | or S14 are performed by a predetermined time interval, even if the local communication apparatus 3 enters / leaves LAN, it is memorize | stored in the domain name provision information memory | storage part 123 of memory | storage part 12-A. Domain name assignment information is updated appropriately.

  When domain names have been assigned to all local communication devices 3 in the LAN, the domain name registration unit 113-A of the central processing unit 11-A stores the domain name assignment information storage unit 123 of the storage unit 12-A. A first domain name notification signal containing the stored domain name assignment information indicating the correspondence between the domain name assigned to the local communication device 3 and the IP address of the local communication device 3 is stored, and the router device 4 is To the domain name management server 2-A (S15). The first domain name notification signal is transmitted to the domain name management server 2-A via the router device 4 and the network 6.

  The domain name registration unit 211-A in the central processing unit 21-A of the domain name management server 2-A that has received the first domain name notification signal receives the router device 4 from the transmission source IP address of the first domain name notification signal. The IP address is extracted, and domain name assignment information indicating the correspondence between the domain name of the local communication device 3 and the IP address of the local communication device 3 is extracted from the payload portion (data portion) of the first domain name notification signal. The domain name assignment information is registered as domain name management information in the domain name database unit 23-A in association with the IP address of the router device 4.

  By operating in this way, the domain name management server 2-A associates the domain name assigned to the local communication device 3 by the domain name assigning device 1-A with the IP address of the local communication device 3, and the domain name database It can be registered in the unit 23-A, and the domain name and IP address of the local communication device 3 can be associated with the IP address of the router device 4 included in the LAN of the local communication device 3. Since the process S15 is executed at a predetermined time interval, even if the local communication device 3 enters or leaves the LAN, the domain name management server 2-A is stored in the domain name database unit 23-A. Domain name management information can be updated appropriately. Also, by providing one domain name management server 2-A for a plurality of LANs, the domain name of the local communication device 3 can be efficiently managed.

  When the domain name is assigned to the local communication device 3 and registered in the domain name management server 2-A in this way, for example, from one local communication device 3 (for example, PC) in the LAN to another local communication device 3 ( For example, when communicating with a web camera), communication can be performed using a domain name. That is, when a user inputs the domain name of a communication destination local communication device 3 to a certain local communication device 3 based on the domain name candidate information in order to perform communication using the domain name, the name resolution request is sent to the certain local communication device. The name resolution request transmitted from the device 3 is rewritten to the IP address of the router device 4 by the NAT (Net Address Translation) function of the router device 4, and the DNS in the network 6 is passed through the router device 4. It is finally transmitted to the domain name management server 2-A via a server or the like. The name resolution unit 212-A in the central processing unit 21-A of the domain name management server 2-A stores the name resolution request in the domain name database unit 23-A based on the IP address and domain name of the router device 4 that has transferred the name resolution request. The name resolution is performed by searching for the IP address from the first domain name management information, and the IP address corresponding to the domain name of the name resolution request is returned to the certain local communication device 13. A local communication device 3 that has received this reply communicates with another local communication device 3 using the returned IP address.

  In the first embodiment, the IP address of the local communication device 3 may be a global IP address. By using the global IP address, the router device 4 does not need the NAT function, and the global IP address is registered as the IP address of the local communication device 3 in the domain name management server 2-A.

Next, another embodiment will be described.
(Configuration of Second Embodiment)
In the first embodiment, the domain name assigning device 1-A and the router device 4 are configured separately. However, the domain name assigning device 1-B according to the second embodiment includes a domain name assigning device and a router. This is a domain name assigning device with a routing function, which is configured integrally with the device.

  FIG. 5 is a diagram showing a configuration of a domain name management system according to the second embodiment. FIG. 6 is a diagram showing the configuration of the domain name assigning apparatus and the configuration of NATP information according to the second embodiment. 6A is a block diagram showing the configuration of the domain name assigning apparatus, and FIG. 6B shows the configuration of NATP information. FIG. 7 is a diagram showing the configuration of the domain name database.

  In FIG. 5, the domain name management system DMS-B includes a domain name assigning device 1-B, a domain name management server 2-B, and one or a plurality of local communication devices 3. A domain name assigning device 1-B and the local communication device 3 are connected to each other via a transmission line 5 so that they can communicate with each other. The domain name assigning device 1-B and the domain name management server 2-B are mutually connected via an external network 6. It is connected so that it can communicate. The domain name assigning device 1-B, the local communication device 3, and the transmission path 5 constitute a LAN, and these are arranged in a home, for example.

  In the second embodiment, since the domain name assigning device 1-B with the routing function is used instead of the router device 14 and the domain name assigning device 1-A in the first embodiment, the second embodiment relates to the second embodiment. The local communication device 3, the transmission line 5, and the network 6 are the same as the local communication device 3, the transmission line 5, and the network 6 according to the first embodiment, respectively, and thus description thereof is omitted.

  The domain name assigning apparatus 1-B assigns a domain name to the local communication device 3 connected to the LAN transmission path 5, and performs routing (path selection) of communication signals according to the routing table in which the path information is registered. And an external network 6 are communicably connected to each other and perform DHCP on a communication terminal (node, host) such as a local communication device 3 in the LAN. For example, as shown in FIG. 6, the domain name assigning apparatus 1-B includes a central processing unit 11-B, a storage unit 12-B, a bus 14, a LAN side communication interface unit 15, and a WAN side communication interface unit. 16 is configured.

  Since the LAN-side communication interface unit 15 is the same as the communication interface unit 13 in the first embodiment, the description thereof is omitted. The WAN side communication interface unit 16 is a circuit that is connected to the external network 6 and performs communication. The WAN side communication interface unit 16 generates a communication signal according to the communication protocol of the network 6 based on the data from the central processing unit 11-B and the network 6. Is converted into data in a format that can be processed by the central processing unit 11-B. A private IP address is allocated to the LAN side communication interface unit 15, and a global IP address is allocated to the WAN side communication interface unit 16.

  Similarly to the storage unit 12-A in the first embodiment, the storage unit 12-B includes an IP address information storage unit 121, a domain name candidate information storage unit 122, and a domain name assignment storage unit 123. , A NAPT information storage unit 124 for storing NAPT (Network Address Port Translation) information, assigns a domain name to the local communication device 3, and transmits the assigned domain name and IP address to the domain name management server 2-B. Various programs such as a domain name assigning program and various data such as data necessary for executing various programs such as a domain name of the domain name assigning apparatus 1-B and data generated during the execution are stored. The storage unit 12-B includes, for example, a volatile storage element such as a RAM, and a nonvolatile storage element such as a ROM or EEPROM.

  The NAPT information is information for converting the IP address and port number between the IP address and port number in the external network 6 and the IP address and port number in the LAN, and the IP address and port of the local communication device 3 This is information indicating a correspondence relationship with a number. For example, the NAPT information is stored in a table format as shown in FIG. The NAPT table 302 shown in FIG. 6B includes an IP address registration unit 321 (321-1, 321-2,...) Of NAPT information for registering the IP address of the local communication device 3, and the local communication device 3. The port number registration unit 322 (322-1, 322-2,...) For example, in the example shown in FIG. 6B, the IP address; “192.168.0.50” 321-1 and the port number; “20001” 322-1 are in a correspondence relationship, and the IP address; “192. 168.0.100 "321-2 and the port number;" 20002 "322-2 are in a correspondence relationship.

  The central processing unit 11-B includes, for example, a microprocessor and its peripheral circuits, and functionally includes a detection unit 111, a domain name assigning unit 112, a domain name registration unit 113-B, and a port number. A grant unit 114, a NAPT (Network Address Port Translation) unit 115, and a DHCP unit 116 are provided, and the storage unit 12-B, the LAN-side communication interface unit 15 and the WAN-side communication interface unit 16 have the functions according to the control program. Each is controlled accordingly.

  Since the detection unit 111 and the domain name assigning unit 112 are the same as the detection unit 111 and the domain name assigning unit 112 in the first embodiment, description thereof is omitted. The port number assignment unit 114 assigns a port number to the local communication device 3 detected by the detection unit 111, generates NAPT information based on the assigned port number, and stores the generated NAPT information in the storage unit 12-B. The data is stored in the NATP information storage unit 124. Then, the port number assigning unit 114 opens the port number assigned to the local communication device 3 among the port numbers in the WAN side communication interface unit 16.

  The NAPT unit 115, when transmitting a communication signal from the local communication device 3 in the LAN to the network 6, based on the NAPT information stored in the NAPT information storage unit 124 of the storage unit 12-B, After storing the transmission source port number of the communication signal to be transmitted to the storage unit 12-B in association with the transmission source IP address, the port number of the local communication device 3 corresponding to the transmission source IP address of this communication signal is stored. Searching from the NAPT information, the transmission port number of the communication signal is rewritten with the searched port number, and the transmission source IP address of the communication signal is rewritten to the IP address of the own device and then transmitted. Then, when the NAPT unit 115 transmits a communication signal from the network 6 to the local communication device 3 in the LAN, this NAPT unit 115 is based on the NAPT information stored in the NAPT information storage unit 124 of the storage unit 12-B. The IP address of the local communication device 3 corresponding to the transmission destination port number of the communication signal to be transmitted into the LAN is searched from the NAPT information, and the transmission destination IP address of this communication signal is determined by the searched IP address of the local communication device. In addition to rewriting, the transmission destination port number of this communication signal is rewritten to the original transmission source port number stored in the storage unit 12-B when transmitting from the LAN to the network 6, and then transmitted.

  The domain name registration unit 113-B receives the domain name assignment information indicating the correspondence between the domain name assigned by the domain name assignment unit 112 and the port number assigned by the port number assignment unit 114, and the domain name and port number. A communication signal (second domain name notification signal) accommodating the domain name of the assigned domain name assigning device 1-B is transmitted to the domain name management server 2-B via the network 6. The DHCP unit 116 performs DHCP for each local communication device 3 in the LAN.

  The central processing unit 11-B, the storage unit 12-B, the LAN side communication interface unit 15 and the WAN side communication interface unit 16 are connected by a bus 14 so that data can be exchanged with each other.

  On the other hand, the domain name management server 2-B manages information (second domain name management information) necessary for performing name resolution for the domain name of the local communication device 3 and also passes through the domain name assigning device 1-B. This is a server computer that performs name resolution by converting a domain name into an IP address and returning an IP address in accordance with the inquiry from the local communication device 3. For example, as shown in FIG. 3A, the domain name management server 2-B includes a central processing unit 21-B, a communication interface unit 22, a domain name database unit 23-B, a storage unit 24, a bus, 25.

  Since the communication interface unit 22, the storage unit 24, and the bus 25 in the second embodiment are the same as the communication interface unit 22, the storage unit 24, and the bus 25 in the first embodiment, description thereof is omitted.

  The domain name database unit 23-B accumulates and manages the second domain name management information, and includes, for example, a hard disk that stores data having a relatively large capacity.

  The second domain name management information includes domain name assigning device domain name management information for managing the domain name of the domain name assigning device 1-B and local communication device domain name management for managing the domain name of the local communication device 3. Information.

  In this embodiment, the domain name assigning device domain name management information is information indicating the correspondence relationship between the domain name and the IP address of the domain name assigning device 1-B. As shown in FIG. Stored and managed by The domain name assigning device domain name management table 402 shown in FIG. 7A is a domain name registration unit 421 (421-1, 421-421) of second domain name management information for registering the domain name of the domain name assigning device 1-B. 2..., And an address registration unit 422 (422-1, 422) of second domain name management information that registers the IP address of the domain name assigning device 1-B associated with each domain name registration unit 421. -2, ...).

  For example, in the example shown in FIG. 7B, the domain name; “KAWASAKI” and the IP address; “133.254.30.52” are in a correspondence relationship, and the domain name; “NOMURA” and the IP address; .254.64.38 ".

  In this embodiment, the local communication device domain name management information indicates the correspondence between the domain name of the domain name assigning device 1-B router device 4, the domain name of the local communication device 3, and the port number of the local communication device 3. It is information to show. By associating the domain name of the domain name assigning device 1-B with the correspondence between the domain name of the local communication device 3 and the port number of the local communication device 3, the domain name assigning device 1- 1 of the LAN including the local communication device 3 is associated. It is managed so that the correspondence with B can be understood.

  For example, as shown in FIG. 7B, the local communication device domain name management information is stored and managed in a table format. The local communication device domain name management table 403 shown in FIG. 7B is a domain name registration unit 431 (431-11, 431-12,...) Of local communication device domain name management information for registering the domain name of the local communication device 3. .., 431-21, 431-22,...) And the port number registration of the local communication device domain name management information that registers the port number of the local communication device 3 associated with each domain name registration unit 431. 432 (432-11, 432-12, ..., 432-21, 432-22, ...). The local communication device domain name management table 403 includes a domain name registration unit 431 and a port number registration unit 432 so that the correspondence relationship with the domain name assigning device 1-B of the LAN including the local communication device 3 can be understood. The domain name assigning device domain name registration unit 433 (433-1, 433-2) for registering the domain name of the domain name assigning device 1-B in the LAN including the local communication device 3 is inserted between the plurality of sets. Are separated.

  For example, in the example shown in FIG. 7B, the domain name; “Webcam.xxxx.co.jp” and the port number; “20001” are in a correspondence relationship, and the domain name; “PC.xxxx.co.jp” And the port number; “20002”, and the local communication devices 3 having these domain names are in the LAN of the domain name assigning apparatus 1-B having the domain name “KAWASAKI”. On the other hand, the domain name; “Webcam.xxxx.co.jp” and the port number; “30001” have a correspondence relationship, and the domain name; “TV.xxxx.co.jp” and the port number; “30002” correspond to each other. The local communication devices 3 having these domain names are in the LAN of the domain name assigning apparatus 1-B having the domain name “NOMURA”.

  The central processing unit 21-B includes, for example, a microprocessor and its peripheral circuits, and functionally includes a domain name registration unit 211-B and a name resolution unit 212-B, and in accordance with a control program. The communication interface unit 22, the domain name database unit 23-B, and the storage unit 24 are controlled according to the functions.

  When the domain name registration unit 211-B receives the second domain name notification signal, the domain name registration unit 211-B extracts the IP address of the domain name assigning device 1-B from the transmission source communication address in the received second domain name notification signal, The domain name of the domain name assigning device 1-B accommodated in the domain name notification signal, the domain name of the local communication device 3, and the port number are extracted and registered in the domain name database unit 23-B. The name resolution unit 212-B converts the domain name into an IP address by referring to the second domain name management information of the domain name database unit 23-B according to the inquiry from the local communication device 3, and the converted IP address Reply.

  The central processing unit 21-B, the communication interface unit 22, the domain name database unit 23-B, and the storage unit 24 are connected by a bus 25 so that data can be exchanged with each other.

Next, the operation of this embodiment will be described.
(Operation of Second Embodiment)
FIG. 8 is a flowchart showing the operation of the domain name assigning apparatus according to the second embodiment.

  First, after installing the domain name assigning device 1-B, the installer or user connects a setting tool to the LAN in which the domain name assigning device 1-B is installed, for example, and uses the setting tool to set the domain name assigning device. The domain name is stored and set in the storage unit 12-B of 1-B. Further, for example, a contractor or a user installs application software of a setting tool on a PC connected to the LAN in which the domain name assigning device 1-B is installed, and uses the PC that has become the setting tool to use the domain name assigning device. The domain name is stored and set in the storage unit 12-B of 1-B. Further, for example, the domain name assigning device 1-B is further provided with a domain name input unit 17 for inputting a domain name composed of, for example, a keyboard indicated by a broken line in FIG. 6A. The domain name is input using the domain name input unit 17, and the domain name is stored and set in the storage unit 12-B of the domain name assigning apparatus 1-B.

  In FIG. 8, the domain name assigning program is started at predetermined time intervals. First, the central processing unit 11-B of the domain name assigning apparatus 1-B performs the processes S11, S12, and S13 in the first embodiment. Similarly, the local communication device 3 detection process (S21), the domain name assignment process (S22), and the domain name assignment information storage process (S23) are executed.

  Next, the port number assigning unit 114 in the central processing unit 11-B of the domain name assigning apparatus 1-B assigns and assigns a port number to the local communication device 3 detected in step S21 (S24). Next, the port number assigning unit 114 associates the port number assigned in the process S24 with the IP address of the local communication device 3 and stores them in the NAPT information storage unit 124 of the storage unit 12-B. In order to make it accessible, the port of the assigned port number is opened in the WAN side communication interface unit 16 (S25).

  Then, the central processing unit 11-B, for example, performs each process of the above-described processing S21 to S25 on the IP address stored in the IP address information storage unit 121 of the storage unit 12-B, thereby performing LAN processing. Each of the processes S21 to S25 is executed for all of the local communication devices 3 (S26).

  By operating in this way, the domain name assigning apparatus 1-B assigns domain names and port numbers to all local communication devices 3 in the LAN, and the domain name and IP address in each local communication device 3 are assigned. Is stored in the domain name assignment information storage unit 123 of the storage unit 12-B, and the correspondence relationship between the port number and the IP address in each local communication device 3 is stored in the NAPT information storage unit 124 of the storage unit 12-B. Can be remembered. And since the said process S21 thru | or S26 are performed at a predetermined time interval, even if the local communication apparatus 3 enters and leaves the LAN, the domain name assignment information storage unit 123 and the NAPT information storage of the storage unit 12-B The domain name assignment information and NAPT information stored in the unit 124 are appropriately updated.

  When the domain name and port number have been assigned to all local communication devices 3 in the LAN, the domain name registration unit 113-B of the central processing unit 11-B stores the domain name assignment information in the storage unit 12-B. The second storing the domain name assignment information indicating the correspondence between the domain name assigned to the local communication device 3 and the port number and the domain name information of the domain name assignment device 1-B stored in the unit 123. A domain name notification signal is generated and transmitted to the domain name management server 2-B (S27). The second domain name notification signal is transmitted to the domain name management server 2-B via the network 6.

  The domain name registration unit 211-B in the central processing unit 21-B of the domain name management server 2-B that has received the second domain name notification signal receives the domain name assigning device 1 from the transmission source address of the second domain name notification signal. -B's IP address is extracted, the domain name of the domain name assigning device 1-B is extracted from the payload portion (data portion) of the second domain name notification signal, and each piece of the extracted information is used as domain name assigning device domain name management information. Register in the domain name database unit 23-B. Further, the domain name registration unit 211-B obtains each piece of information indicating the correspondence between the domain name of the local communication device 3 and the IP address of the local communication device 3 from the payload part (data part) of the second domain name notification signal. The extracted information is associated with the domain name of the domain name assigning device 1-B and registered in the domain name database unit 23-B as local communication device domain name information.

  By operating in this manner, the domain name management server 2-B associates the domain name assigned to the local communication device 3 by the domain name assigning device 1-B with the port number of the local communication device 3, and the domain name database The domain name and the port number of the local communication device 3 can be associated with the domain name of the domain name assigning device 1-B included in the local communication device 3 LAN. Furthermore, the domain name management server 2-B can associate the domain name of the domain name assigning apparatus 1-B with the IP address. And since the said process S27 is performed at a predetermined time interval, even if the local communication apparatus 3 enters and leaves the LAN, the domain name management server 2-B is stored in the domain name database unit 23-B. Domain name management information can be updated appropriately. Further, by providing one domain name management server 2-B for a plurality of LANs, the domain name of the local communication device 3 can be efficiently managed.

  When the domain name and the port number are assigned to the local communication device 3 and registered in the domain name management server 2-B in this way, for example, a certain communication device (not shown) in the network 6 can connect to the local communication device in the LAN. 3 (for example, a web camera), a domain name (for example, “KAWASAKI.Webcam.xxxx.co” added with “the domain name of the domain assigning device 1-B” to “the domain name of the local communication device 3”) is communicated. .Jp ") can be used for communication. It should be noted that such a rule that defines the structure of the domain name is distributed to the user in a bundle with the domain name assigning apparatus 1-B, for example.

  When a domain name is input to a certain communication device, a name resolution request is transmitted from this certain communication device, and this name resolution request is finally sent via a DNS server or the like in the network 6. Sent to 2-B. The name resolution unit 212-B in the central processing unit 21-B of the domain name management server 2-B uses the domain name assigning device domain name stored in the domain name database unit 23-B based on the domain name of the name resolution request. The IP address of the domain name assigning device 1-B is searched from the management information, and the local communication is performed from the local communication device domain name management information stored in the domain name database unit 23-B based on the domain name of the name resolution request. The name resolution is performed by searching the port number of the device 3, and the IP address of the searched domain name assigning device 1-B corresponding to the domain name of the name resolution request and the port number of the local communication device 3 are set in this certain communication. Reply to the device. A certain communication device that has received this reply uses the returned IP address of the domain name assigning apparatus 1-B as a destination IP address, and uses the returned port number of the local communication device 3 as a destination port number. It uses to communicate with the local communication device 3.

  In the first embodiment, as indicated by a broken line in FIG. 2, the central processing unit 11-A is further provided with a name acquisition unit 117 that functionally acquires the name from the local communication device 3, and in the process S12 The domain name is assigned after the port scan is performed, by further acquiring a name from the local communication device 3 using the name acquisition unit 117, and using the name as the domain name of the local communication device 3. Also good. In particular, when the local communication device 3 is a home security terminal, the name is stored in the home security terminal, and the name can be acquired. Similarly, the second embodiment may be configured to further include a name acquisition unit.

  In the first embodiment, the processes S11 to S15 are executed at predetermined time intervals, but an instruction to start the domain name assignment program and execute the processes S11 to S15 is issued to the domain name assigning device 1-. You may comprise so that the trigger production | generation part 18 input into A may further be provided in the domain name provision apparatus 1-A as shown with a broken line in FIG. The trigger generation unit 18 includes a switch such as a push button switch and a peripheral circuit that generates a trigger signal in accordance with the switch operation. Also with this configuration, when the local communication device 3 enters or leaves the LAN, the user operates the trigger generation unit 18 to store the domain name assignment information storage unit 123 of the storage unit 12-A. The domain name assignment information is updated in a timely manner, and the domain name management information stored in the domain name database unit 23-A is also updated in a timely manner. Similarly, the second embodiment may be configured to further include a trigger generation unit.

It is a figure which shows the structure of the domain name management system which concerns on 1st Embodiment. It is a figure which shows the structure of the domain name provision apparatus which concerns on 1st Embodiment, and domain name provision information. It is a figure which shows the structure of a domain name management server, and the structure of a domain name database. It is a flowchart which shows operation | movement of the domain name provision apparatus which concerns on 1st Embodiment. It is a figure which shows the structure of the domain name management system which concerns on 2nd Embodiment. It is a figure which shows the structure of the domain name provision apparatus which concerns on 2nd Embodiment, and the structure of NATP information. It is a figure which shows the structure of a domain name database. It is a flowchart which shows operation | movement of the domain name provision apparatus which concerns on 2nd Embodiment.

Explanation of symbols

1-A, 1-B Domain name assigning device 2-A, 2-B Domain name management server 3 Local communication device 4 Router device 11-A, 11-B, 21-A, 21-B Central processing unit 12-A , 12-B, 24 Storage unit 13, 22 Communication interface unit 14, 25 Bus 15 LAN side communication interface unit 16 WAN side communication interface unit 17 Domain name input unit 18 Trigger generation unit 23-A, 23-B Domain name database unit DESCRIPTION OF SYMBOLS 111 Detection part 112 Domain name provision part 113-A, 113-B Domain name registration part 114 Port number provision part 115 NAPT part 116 DHCP part 117 Name acquisition part 121 IP address information storage part 122 Domain name candidate information storage part 123 Domain name Grant information storage unit 124 NAPT information storage unit 211-A, 211-B Domain name registration Part 212-A, 212-B name resolution part

Claims (6)

In a domain name assigning device that assigns a domain name to a local communication device connected to a transmission path of a local area network,
A communication unit connected to the transmission path of the local area network for communication;
A detection unit for detecting the local communication device;
A domain name giving unit for giving a domain name to the local communication device detected by the detecting unit;
Managing and associating a communication address of a router device that is communicably connected between the local area network and an external network, a domain name of the local communication device, and a communication address of the local communication device. A domain name registration unit for transmitting a communication signal containing the domain name assigned by the domain name assigning unit and the communication address of the local communication device to which the domain name is assigned via the router device And a domain name assigning device. At a predetermined timing, the detection unit detects the local communication device, the domain name assigning unit assigns a domain name to the local communication device detected by the detection unit, and the domain name registration unit provides the domain name management server The domain name assigning device according to claim 1, wherein the communication signal is transmitted via the router device. The domain name assigning apparatus according to claim 1, wherein the communication address is a global IP address. In a domain name assigning device for assigning a domain name to a local communication device connected to a transmission path of a local area network and routing a communication signal,
A first communication unit connected to a transmission path of the local area network for communication;
A second communication unit that is communicably connected to an external network and performs communication;
A detection unit for detecting the local communication device;
A domain name giving unit for giving a domain name to the local communication device detected by the detecting unit;
A port number giving unit for assigning a port number to the local communication device detected by the detection unit;
Domain name of own device, IP address of own device, domain name of local communication device assigned by domain name assigning unit, and local communication device assigned by port number assigning unit associated with domain name A storage unit for storing the port number of
Managing the domain name and IP address of the domain name assigning device in association with each other, managing the domain name of the domain name assigning device, the domain name of the local communication device, and the port number of the local communication device and managing the name The domain name management server that performs the communication includes a communication signal that contains the domain name of its own device stored in the storage unit, the domain name of the local communication device, and the port number of the local communication device. A domain name registration unit that transmits as the IP address of its own device
When transmitting a communication signal from the local area network to the network, based on the storage contents of the storage unit, the transmission source port number of the communication signal is stored in the storage unit and then the transmission source IP address Is rewritten with the port number of the local communication device corresponding to the transmission address, the transmission source IP address of the communication signal is rewritten to the IP address of the own device, and the communication signal is transmitted from the network to the local area network. In this case, based on the storage contents of the storage unit, the destination IP address of the communication signal is rewritten with the IP address of the local communication device corresponding to the destination port number of the communication signal, and the transmission of the communication signal is performed. The network address to be transmitted after rewriting the destination port number to the original source port number stored in the storage unit Domain name application device, characterized in that it comprises a port conversion unit. A communication unit connected to a network transmission path for communication;
A communication address of a router device that connects the local area network and the network so as to be communicable, a communication address of a local communication device connected to a transmission path of the local area network, and the local communication device A database unit that manages the domain name in association with each other,
The router accommodated as a source communication address in the received communication signal when a communication signal accommodating the domain name of the local communication device and the communication address of the local communication device is received via the router device A registration unit that registers a communication address of a device, a domain name of the local communication device accommodated in the received communication signal, and a communication address of the local communication device in association with each other in the database unit;
A domain name management server comprising: a name resolution unit that performs name resolution by referring to the database unit when a name resolution request is received from the router device. A router device that connects a local area network and an external network so as to be communicable, a local communication device connected to a transmission path of the local area network, and a domain name for the local communication device Domain name comprising: a domain name assigning device; a domain name management server that manages the communication address of the router device, the domain name of the local communication device, and the communication address of the local communication device in association with each other and performs domain name resolution In the management system,
The domain name management system according to any one of claims 1 to 3, wherein the domain name assignment device is the domain name assignment device according to any one of claims 1 to 3.

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