JP6288696B2 - COMMUNICATION DEVICE, COMMUNICATION SYSTEM, COMMUNICATION METHOD, AND PROGRAM - Google Patents

Description

  The present invention relates to a communication device, a communication system, a communication method, and a program, and more particularly to a communication device, a communication system, a communication method, and a program that perform IP address search.

  In recent years, a wireless local area network (LAN) is often used for a home network. Therefore, a wireless LAN access point is arranged in the home network in order to connect from the home network to an external network. At this time, the user needs to set the security level of the wireless LAN access point, for example. Therefore, the user needs to access the wireless LAN access point from a terminal device or the like connected to the wireless LAN access point, and perform settings related to several functions via the setting screen of the wireless LAN access point.

  Here, Patent Document 1 discloses that a message such as Ping is transmitted to a plurality of devices to be confirmed in order to confirm the state of the device connected to the LAN. When a message such as Ping is transmitted, the status of the apparatus is confirmed using a response message of the Ping message. When the device to be checked is a wireless LAN access point, the terminal device or the like can check the state of the wireless LAN access point by accessing the wireless LAN access point.

JP 2004-247866 A

  However, in the device status confirmation method disclosed in Patent Document 1, it is assumed that the IP address of the device to be confirmed is known in advance. Therefore, it is possible to transmit or access a Ping message to the device to be confirmed. However, for example, an IP address is automatically assigned to a wireless LAN access point by a host DHCP (Dynamic Host Configuration Protocol) server. In order to access a wireless LAN access point, the communication terminal needs to specify and access an IP address assigned to the wireless LAN access point. However, generally, the IP address assigned to the wireless LAN access point is not notified to the communication terminal. Therefore, even when it is necessary to access the wireless LAN access point for setting, there arises a problem that the communication terminal cannot access the wireless LAN access point.

  An object of the present invention is to provide a communication device, a communication system, a communication method, and a program capable of easily realizing access from a communication terminal to a wireless LAN access point in order to solve such a problem. .

  When the communication device according to the first aspect of the present invention receives the first message from the termination device via the relay device and the communication unit that performs communication with the termination device that performs relay communication with the termination device, A determination unit configured to determine whether the first message includes predetermined information; and a control unit configured to transmit IP address information corresponding to the predetermined information to the terminal device according to the determination result It is.

  A communication system according to a second aspect of the present invention includes a termination device, a relay device that performs relay communication with the termination device, and a communication device that communicates with the relay device, and the communication device includes the relay device. A communication unit that communicates with the device, a determination unit that determines whether the first message includes predetermined information when the first message is received from the terminal device via the relay device, and the determination result And a control unit that transmits IP address information corresponding to the predetermined information to the terminal device.

  A communication method according to a third aspect of the present invention communicates with a relay device that performs relay communication with a terminal device, receives a first message from the terminal device via the relay device, and transmits the first message to the relay device. It is determined whether predetermined information is included, and IP address information corresponding to the predetermined information is transmitted to the terminal device according to the determination result.

  A program according to a fourth aspect of the present invention communicates with a relay device that performs relay communication with a termination device, receives a first message from the termination device via the relay device, and stores a predetermined message in the first message. Information is included, and the computer is caused to transmit the IP address information corresponding to the predetermined information to the terminal device according to the determination result.

  According to the present invention, it is possible to provide a communication device, a communication system, a communication method, and a program capable of easily realizing access from a communication terminal to a wireless LAN access point.

1 is a configuration diagram of a communication system according to a first exemplary embodiment; 1 is a configuration diagram of a communication system according to a first exemplary embodiment; FIG. 3 is a configuration diagram of a communication system according to a second exemplary embodiment. It is a figure which shows the flow of the DNS Query message reception process concerning Embodiment 2. FIG. It is a figure which shows the flow of the DNS Query message reception process concerning Embodiment 2. FIG. It is a figure which shows the flow of the DNS Query message reception process concerning Embodiment 2. FIG. It is a figure which shows the flow of the DNS Query message reception process concerning Embodiment 2. FIG. It is a figure which shows the flow of the DNS Query message reception process concerning Embodiment 3. FIG. It is a figure which shows the flow of the DNS Query message reception process concerning Embodiment 3. FIG.

(Embodiment 1)
Embodiments of the present invention will be described below with reference to the drawings. A configuration example of a communication system according to the first exemplary embodiment of the present invention will be described with reference to FIG. The communication system of FIG. 1 includes a communication device 1, a relay device 5, and a termination device 6. Furthermore, the communication device 1 includes a communication unit 2, a determination unit 3, and a control unit 4.

  The termination device 6 communicates with the relay device 5. Further, the communication device 1 communicates with the relay device 5. Below, the structural example of the communication apparatus 1 is demonstrated.

  The communication unit 2 communicates with the relay device 5. The communication unit 2 receives a message transmitted from the termination device 6 via the relay device 5. When receiving a message transmitted from the termination device 6 via the relay device 5, the determination unit 3 determines whether the message includes predetermined information.

  The control unit 4 transmits IP address information corresponding to predetermined information to the terminal device 6 according to the determination result in the determination unit 3.

  Next, referring to FIG. 2, when an address control device is used as the communication device 1 in FIG. 1, a wireless LAN access point is used as the relay device 5 in FIG. 1, and a communication terminal 30 is used as the termination device 6 in FIG. The communication system will be described.

  The communication system in FIG. 2 includes an address control device 10, a wireless LAN access point (wireless LAN AP) 20, a communication terminal 30, and a device 40. The address control device 10 further includes a communication unit 11, a determination unit 12, an NBT (NetBIOS over TCP / IP) control unit 13, and a storage unit 14. As the address control device 10, for example, a computer device or a server device is used.

  The communication terminal 30 is connected to the wireless LAN access point 20 via a wireless line. The communication terminal 30 may be a mobile phone terminal, a smartphone terminal, a tablet terminal, a notebook personal computer, or the like.

  The wireless LAN access point 20 is arranged between the communication terminal 30 and the address control device 10 and relays communication between the address control device 10 and the communication terminal 30. The device 40 is a device connected to the address control device 10, and may be a wireless LAN access point different from the wireless LAN access point 20, or may be a communication device such as an operation terminal.

  The address control device 10 is a device connected to the wireless LAN access point 20 and the device 40, and is a computer device such as a server device. Next, each component of the address control device 10 will be described.

  The communication unit 11 receives a DNS Query message transmitted from the communication terminal 30. If the IP address of the communication destination device is unknown, the communication terminal 30 designates the communication destination device and transmits a DNS Query message to acquire the IP address of the communication destination device. Here, the communication terminal 30 transmits a DNS Query message to the address control device 10.

  Further, the communication unit 11 transmits the IP address of the device specified in the DNS Query message to the communication terminal 30.

  The determination unit 12 determines whether or not the DNS Query message transmitted from the communication terminal 30 is a predetermined DNS Query message for searching for the wireless LAN access point 20 including the device name of the wireless LAN access point 20. . The device name of the wireless LAN access point 20 may be, for example, identification information that can uniquely identify each device connected to the address control device 10.

  The DNS Query message for searching for the wireless LAN access point 20 is a message different from the DNS Query message used for searching for an IP address of another device using a DNS server or the like. For example, a DNS Query message for searching for the wireless LAN access point 20 may be distinguished from a DNS Query message used for searching for an IP address of another device by including predetermined information or an identifier. Good.

  The NBT control unit 13 acquires the IP address of the wireless LAN access point 20 by transmitting the NBT message when the determination unit 12 determines that the DNS Query message is a DNS Query message for searching for the wireless LAN access point 20. To do. The NBT control unit 13 transmits an NBT message specifying the device name of the wireless LAN access point 20 to the devices connected in the same wireless LAN segment. The same wireless LAN segment may be a network that connects devices under the control of the address control device 10, for example. In this figure, the address control device 10, the wireless LAN access point 20, the communication terminal 30, and the device 40 are devices arranged in the same wireless LAN segment.

  If the NBT message is a message transmitted to the own device, the device 40 that has received the NBT message transmits a response message in which the IP address of the own device is set to the NBT control unit 13. Therefore, when the wireless LAN access point 20 receives the NBT message specifying the device name of the wireless LAN access point 20, the wireless LAN access point 20 transmits a response message in which the IP address of the own device is set to the NBT control unit 13.

  The storage unit 14 manages the wireless LAN access point 20 acquired using the NBT message in association with the IP address of the wireless LAN access point 20.

  Each of the communication unit 11 and the NBT control unit 13 is used as an interface for communicating with an external device of the address control device 10 such as the wireless LAN access point 20. For example, when the address control device 10 is a computer device, the determination unit 12 may use a CPU (Central Processing Unit).

  As described above, by using the communication system of FIG. 1 and FIG. 2, the communication terminal 30 sends a DNS Query message to the communication unit 11 of the address control device 10 when the IP address of the wireless LAN access point 20 is unknown. Send. In this case, when the determination unit 12 of the address control device 10 determines that the received DNS Query message is a DNS Query message for searching for the wireless LAN access point 20, the NBT control unit 13 uses the NBT message to perform wireless LAN access. The IP address of the point 20 is acquired. Further, the address control device 10 transmits the IP address of the wireless LAN access point 20 to the communication terminal 30. Accordingly, the communication terminal 30 can acquire the IP address of the wireless LAN access point 20, and therefore can access the wireless LAN access point 20 using the acquired IP address. Therefore, the communication terminal 30 can set various functions such as security of the wireless LAN access point 20.

(Embodiment 2)
Subsequently, a configuration example of the communication system according to the second exemplary embodiment of the present invention will be described with reference to FIG. FIG. 3 shows a configuration in which a home network 110 is connected to the Internet 100. The home network 110 is a small-scale network formed in a home or the like. The home network 110 includes an ONU (Optical Network Unit) 50, an address control device 10, a wireless LAN access point 20, and a communication terminal 30. The address control device 10, the wireless LAN access point 20, and the communication terminal 30 are the same as those in FIG. The wireless LAN access point 20 may be assigned an IP address from a DHCP server, or may be manually set with a fixed IP address. The devices constituting the home network 110 are devices arranged in the same wireless LAN segment. Alternatively, the address control device 10 may assign an IP address to devices connected to the same wireless LAN.

  The ONU 50 is a device used to convert an optical signal and an electrical signal when the home network 110 connects to the Internet 100 via an optical line. For example, the ONU 50 converts an optical signal transmitted from the Internet 100 into an electrical signal, and transmits the converted electrical signal to the address control device 10. Further, the ONU 50 changes the electrical signal transmitted from the address control device 10 into an optical signal, and transmits the converted optical signal to the Internet 100.

  In this way, the communication terminal 30 is connected to the Internet 100 via the wireless LAN access point 20, the address control device 10, and the ONU 50, and communicates with other communication terminals connected to the Internet 100. In addition, in the figure, a configuration in which one wireless LAN access point 20 is connected to the address control device 10 is shown, but a plurality of wireless LAN access points 20 may be connected to the address control device 10. Further, a plurality of communication terminals 30 may be connected to the wireless LAN access point 20.

  Next, the flow of IP address notification processing of the wireless LAN access point 20 will be described with reference to FIG. First, the communication terminal 30 transmits a DNS Query message to the address control device 10 (S11). For example, the communication terminal 30 may transmit a DNS Query message via a browser. The communication terminal 30 may transmit a DNS Query message to the address control device 10 via the wireless LAN access point 20, and is set between the address control device 10 and the communication terminal 30 without passing through the wireless LAN access point 20. A DNS Query message may be transmitted through the established communication line. In this case, the communication line is a wireless line or a wired line. The communication terminal 30 transmits a DNS Query message in which the device name of the wireless LAN access point 20 is set (hereinafter referred to as an AP search DNS Query message) to the address control device 10.

  Next, when the address control device 10 receives the DNS query message for AP search, the address control device 10 sends an NBT message specifying the device name of the wireless LAN access point 20 set in the DNS query message for AP search within the same wireless LAN segment. (S12). Next, when the wireless LAN access point 20 receives an NBT message in which the device name of its own device is specified from the address control device 10, it transmits an NBT response message in which the IP address of its own device is set to the address control device 10. (S13).

  Next, the address control device 10 sets the IP address of the wireless LAN access point 20 in the DNS Response message, which is a response message to the DNS Query message, and transmits it to the communication terminal 30 (S14).

  Here, the DNS query message for AP search transmitted from the communication terminal 30 to the address control device 10 in step S11 will be described. The communication terminal 30 transmits a URL specifying the device name of the wireless LAN access point 20 and a predetermined domain name as an AP search DNS Query message in order to distinguish it from a normal DNS Query message. For example, if the device name of the wireless LAN access point 20 is “ABCD” and the predetermined domain name is “.special”, the communication terminal 30 determines the URL as “http: //ABCD.special”, A DNS query message for AP search is transmitted. The address control device 10 can determine whether the transmitted DNS Query message is an AP search DNS Query message according to whether or not a domain name “.special” is set in the URL. . Further, since the device name of the wireless LAN access point 20 only needs to be uniquely identified, for example, a MAC address or the like may be used as the device name. The predetermined domain name is not limited to “.special” and may be any other character string.

  Next, the flow of DNS Query message reception processing in the address control apparatus 10 will be described with reference to FIG. First, the communication unit 11 receives a DNS Query message transmitted from the communication terminal 30 (S21). Next, the determination unit 12 determines whether or not the received DNS Query message is an AP search DNS Query message (S22). If it is determined in step S22 that the received DNS Query message is not an AP search DNS Query message, the address control device 10 performs normal packet processing on the DNS Query message (S28). As normal packet processing, for example, the address control device 10 may transmit the received DNS Query message to another DNS server.

  In Step S22, when it is determined that the received DNS Query message is an AP search DNS Query message, the determination unit 12 includes the wireless LAN access point 20 included in the URL transmitted as the AP search DNS Query message. The device name is extracted (S23).

  Next, the determination unit 12 determines whether or not the IP address corresponding to the extracted device name is held (S24). If it is determined in step S24 that the IP address corresponding to the device name of the wireless LAN access point 20 is held, the communication unit 11 transmits information on the held IP address to the communication terminal 30 (S29). ).

  If it is determined in step S24 that the IP address corresponding to the device name of the wireless LAN access point 20 is not held, the NBT control unit 13 performs wireless communication with the device connected in the same wireless LAN segment. An NBT message designating the device name of the LAN access point 20 is transmitted (S25).

  Next, the determination unit 12 determines whether or not an NBT response message for the NBT message has been received (S26). If it is determined in step S26 that the NBT response message has not been received via the NBT control unit 13, a Server failure message is transmitted to the communication terminal 30 via the communication unit 11 (S30). Even when the NBT message is transmitted, the address control device 10 does not receive the NBT response message when the device having the device name set in the NBT message is not connected in the same wireless LAN segment. A server failure message is transmitted to 30.

  In step S26, when the determination unit 12 determines that the NBT response message has been received via the NBT control unit 13, the determination unit 12 manages the device name and the IP address of the device in association with the terminal information table. The IP address of the device set in the NBT message is set in the NBT response message. Therefore, the determination unit 12 manages the IP address set in the NBT response message in association with the device name set in the NBT message. The determination unit 12 manages a plurality of combinations of device names and IP addresses using the terminal information table. The terminal information table may be stored in, for example, a memory in the address control device 10 that is a computer device.

  If the combination of the device name and the IP address is stored in the terminal information table in step S27, the process returns to step S24. In this case, in step S24, the determination unit 12 transmits the IP address to the communication terminal 30 in step S29 in order to determine that the device has an IP address corresponding to the device name set in the AP search DNS Query message. .

  Next, the flow of processing among the communication unit 11, the determination unit 12, and the NBT control unit 13 when a DNS Query message is received will be described with reference to FIG. FIG. 6 shows the flow of processing when determining that the NBT response message has been received in step S26 of FIG.

  First, the communication unit 11 outputs the AP search DNS Query message transmitted from the communication terminal 30 to the determination unit 12 (S51). It is assumed that the device name of the wireless LAN access point 20 is set in the AP search DNS Query message. Next, the determination unit 12 determines that the IP address corresponding to the device name set in the AP search DNS Query message is not held (S52). Next, the determination unit 12 outputs a device name notification message to the NBT control unit 13 in order to notify the device name set in the AP search DNS Query message (S53). Next, the NBT control unit 13 transmits an NBT message in which the device name set in the device name notification message is set to devices under the same wireless LAN segment (S54).

  Next, the NBT control unit 13 receives the NBT response message transmitted from the wireless LAN access point 20 (S55). Next, the NBT control unit 13 outputs an IP address notification message to the determination unit 12 in order to notify the IP address set in the NBT response message (S56). Next, the determination unit 12 outputs the IP address notification message output from the NBT control unit 13 to the communication unit 11 (S57). Next, the communication unit 11 transmits a DNS Response message in which the IP address set in the IP address notification message is set to the communication terminal 30 as a response message of the DNS Query message in Step S51 (S58).

  Next, the flow of processing among the communication unit 11, the determination unit 12, and the NBT control unit 13 when the DNS Query message is received will be described with reference to FIG. FIG. 7 shows the flow of processing when determining that the NBT response message is not received in step S26 of FIG.

  Steps S61 to S64 are the same as steps S51 to S54 in FIG. If the NBT control unit 13 does not receive an NBT response message within a predetermined period after transmitting the NBT message in step S64, the NBT control unit 13 detects a timeout (S65).

  When detecting the timeout, the NBT control unit 13 outputs a non-response notification message to the determination unit 12 in order to notify that the NBT response message has not been received (S66). Next, the determination unit 12 outputs a ServerFailure transmission request message to the communication unit 11 in order to notify that the device related to the device name set in the DNS Query message has not been detected (S67). Next, the communication unit 11 transmits a DNS Response message in which ServerFailure is set to the communication terminal 30 (S68).

  As described above, in the communication system according to the second exemplary embodiment of the present invention, a URL can be used as the DNS query message for AP search. Therefore, the determination unit 12 of the address control apparatus 10 can determine whether or not the received DNS Query message is an AP search DNS Query message. Therefore, the address control device 10 determines whether to process the DNS Query message as a normal packet, or to acquire an IP address corresponding to the device name set in the AP query DNS Query message using the NBT message. Can be determined.

(Embodiment 3)
Next, the flow of DNS Query message reception processing in the address control apparatus 10 according to the third embodiment of the present invention will be described with reference to FIG. In the present embodiment, it is assumed that the device name of the wireless LAN access point 20 is registered in the address control device 10 in advance. For example, an administrator who manages a wireless LAN segment in which the address control device 10 is arranged may register the device name of the wireless LAN access point 20 in the address control device 10 in advance. In the address control device 10, device names of a plurality of wireless LAN access points to be connected may be registered in advance.

  Thus, when the device name of the wireless LAN access point 20 is registered in advance in the address control device 10, the address control device 10 sends an NBT message in which the device name of the registered wireless LAN access point 20 is set, It transmits to the apparatus connected to the same wireless LAN segment (S41). Next, when receiving the NBT message in which the device name related to the own device is set, the wireless LAN access point 20 transmits an NBT response message in which the IP address of the own device is set to the address control device 10 (S42).

  Next, when receiving the NBT response message, the address control device 10 associates the device name set in the NBT message with the IP address set in the NBT response message and stores them in the terminal information table (S43).

  Next, the communication terminal 30 transmits the DNS query message for AP search in which the device name of the wireless LAN access point 20 is set to the address control device 10 (S44). When receiving the DNS query message for AP search, the address control device 10 sets the IP address stored in step S43 in the DNS Response message and transmits it to the communication terminal 30 (S45).

  Next, a processing flow when the address control apparatus 10 receives a DNS Query message in step S44 of FIG. 8 will be described with reference to FIG.

  First, when receiving the DNS Query message transmitted from the communication terminal 30, the communication unit 11 outputs the received DNS Query message to the determination unit 12 (S71). It is assumed that the device name of the wireless LAN access point 20 is set in the DNS Query message transmitted from the communication terminal 30.

  Here, the determination unit 12 has already stored the IP address of the wireless LAN access point 20 in step S43 of FIG. Therefore, the determination unit 12 detects an IP address corresponding to the wireless LAN access point 20 (S72).

  Next, the determination unit 12 transmits an IP address notification message to the communication unit 11 in order to notify the detected IP address (S73). Next, the communication unit 11 transmits a DNS Response message in which the IP address of the wireless LAN access point 20 is set as a DNS Query message response message to the communication terminal 30 (S74).

  As described above, by performing the DNS Query message receiving process according to the third exemplary embodiment of the present invention, the address control device 10 displays the device names of the plurality of connected wireless LAN access points, and the DNS Query message. Can be held before receiving. Therefore, the address control device 10 can acquire the IP address of the wireless LAN access point before receiving the DNS Query message. Thus, the address control device 10 can transmit the held IP address to the communication terminal 30 when receiving the DNS Query message. Therefore, the communication terminal 30 can shorten the time from the transmission of the DNS Query message to the reception of the DNS Query message in which the IP address is set, as compared with the second embodiment.

  In the above-described embodiments, the present invention has been described as a hardware configuration, but the present invention is not limited to this. The present invention can also realize the processing in the address control device 10 by causing a CPU (Central Processing Unit) to execute a computer program. )

  In the above example, the program can be stored and supplied to a computer using various types of non-transitory computer readable media. Non-transitory computer readable media include various types of tangible storage media. Examples of non-transitory computer-readable media include magnetic recording media (for example, flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (for example, magneto-optical disks), CD-ROMs (Read Only Memory), CD-Rs, CD-R / W, semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (Random Access Memory)) are included. The program may also be supplied to the computer by various types of transitory computer readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves. The temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.

  Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention.

(Appendix 1) When receiving a first message from the terminal device via the relay device and a communication unit that performs communication with the relay device that performs relay communication with the terminal device, predetermined information is added to the first message. A communication apparatus, comprising: a determination unit that determines whether to include the information; and a control unit that transmits IP address information corresponding to the predetermined information to the termination device according to the determination result.
(Additional remark 2) When the said control part does not hold | maintain the IP address information corresponding to the said predetermined information, it sends the 2nd message containing the said predetermined information with respect to the said relay apparatus, The said predetermined information The communication apparatus according to appendix 1, wherein the IP address information is acquired by acquiring a third message including the IP address from the relay apparatus corresponding to.
(Supplementary note 3) The communication apparatus according to supplementary note 1 or 2, further comprising a storage unit that stores the predetermined information and the IP address information in association with each other.
(Appendix 4)
The communication device according to any one of appendices 1 to 3, wherein the predetermined information is device information indicating a device name of the relay device.
(Appendix 5)
The communication apparatus according to claim 1, wherein the first message is a DNS Query message.
(Appendix 6)
The communication apparatus according to appendix 5, wherein the determination unit determines whether or not the DNS Query message includes a device name of a wireless LAN access point that is the relay device as the predetermined information.
(Appendix 7)
The communication device according to appendix 6, wherein the DNS Query message is URL information including a device name of the wireless LAN access point.
(Appendix 8)
The communication device according to appendix 2, wherein the second message is an NBT (NetBIOS over TCP / IP) message specifying a device name of a wireless LAN access point.
(Appendix 9)
The communication apparatus according to appendix 2 or 8, wherein the third message is an NBT response message in which the IP address of the own apparatus is set.
(Appendix 10)
A termination device, a relay device that performs relay communication with the termination device, and a communication device that communicates with the relay device. The communication device includes a communication unit that communicates with the relay device, and the relay device. A first message is received from the terminal device via a determination unit that determines whether the first message includes predetermined information, and the predetermined information is transmitted to the terminal device according to the determination result. And a control unit that transmits IP address information corresponding to the communication system.
(Appendix 11)
Communicating with a relay device that performs relay communication with a terminal device, receiving a first message from the terminal device via the relay device, determining whether the first message includes predetermined information, and determining the result And a communication method for transmitting IP address information corresponding to the predetermined information to the terminal device.
(Appendix 12)
Communicating with a relay device that performs relay communication with a terminal device, receiving a first message from the terminal device via the relay device, determining whether the first message includes predetermined information, and determining the result And a program that causes the computer to execute transmission of IP address information corresponding to the predetermined information to the terminal device.

DESCRIPTION OF SYMBOLS 1 Communication apparatus 2 Communication part 3 Discriminating part 4 Control part 5 Relay apparatus 6 Termination apparatus 10 Address control apparatus 11 Communication part 12 Determination part 13 NBT control part 14 Storage part 20 Wireless LAN access point 30 Communication terminal 40 Apparatus 50 ONU
100 Internet 110 Home network

Claims (9)

A communication unit which have line communication with the relay device that relays communication with the terminating device, receiving a first message from the end device via the relay device,
A determination unit for determining whether including device information indicating the device name of the relay device prior Symbol first message,
When the determination unit determines that the device information is included in the first message, the terminal device is set as a relay device corresponding to the device information without communicating with another DNS server . A communication device that transmits IP address information and has a control unit that transmits the first message to another DNS server when the determination unit determines that the device information is not included in the first message. . Wherein, if does not hold the IP address information corresponding to the device information, to the relay apparatus sends a second message including the device information, from the relay device corresponding to the device information The communication apparatus according to claim 1, wherein the IP address information is acquired by acquiring a third message including the IP address. The communication device according to claim 1, further comprising a storage unit that stores the device information and the IP address information in association with each other. The communication apparatus according to any one of claims 1 to 3 , wherein the first message is a DNS Query message. The determination unit, the DNS Query message, the communication device according to claim 4 for determining whether to include a device name of a pre-Symbol repeater wireless LAN access point. The communication apparatus according to claim 5 , wherein the DNS Query message is URL information including a device name of the wireless LAN access point. A termination device;
A relay device that performs relay communication with the termination device;
A communication device for communicating with the relay device,
The communication device may have lines communicating with the relay device, shows a communication unit for receiving a first message from the end device via the relay device, the device name before Symbol the relay device to the first message When determining that the device information is included in the first message, the determining unit that determines whether the device information is included, and the terminal device without communicating with other DNS servers , When the IP address information set in the relay device corresponding to the device information is transmitted and the determination unit determines that the device information is not included in the first message, the first message is transferred to another DNS. And a control unit that transmits to the server . Communicate with the relay device that performs relay communication with the termination device,
Receiving a first message from the terminating device via the relay device;
Determining whether the first message includes device information indicating a device name of the relay device ;
If it is determined that the device information is included in the first message, without communicating with other DNS servers, to said terminal apparatus, transmits the IP address information set in the relay device corresponding to the device information When determining that the device information is not included in the first message, a communication method for transmitting the first message to another DNS server . Communicate with the relay device that performs relay communication with the termination device,
Receiving a first message from the terminating device via the relay device;
Determining whether the first message includes device information indicating a device name of the relay device ;
When determining that the device information is included in the first message, the IP address information set in the relay device corresponding to the device information is transmitted to the terminal device without communicating with another DNS server. A program that causes a computer to execute transmission of the first message to another DNS server when transmitting and determining that the device information is not included in the first message .

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