JP2006163829A - Relay device with redirect function and access method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a relay device that allows a user to use its redirect function without the need for a user's any special operation, while placing no restrictions on the data to be redirected. <P>SOLUTION: In the relay device 12, a receiving part 121 receives a packet from a terminal and the Internet 40. A packet analysis part 122 determines the kind of the packet received and, if it is a packet requesting the redirecting of the packet received, the redirect function is turned on. If the redirect function is on, an address converting part 123 changes the address of the packet received from the terminal into a redirect address. When the redirect packet is on, a packet generating part 124 generates a redirect packet. An encrypting part 125 encrypts the packet generated by the packet generating part 124. A transmitting part 126 transmits the packet generated by the packet generating part 124 and the packet received from the Internet 40. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a relay apparatus having a redirect function and an access method thereof, and more specifically to a relay apparatus having a redirect function that can be controlled from an external device and an access method thereof.

  One of web server responses in HTTP (HyperText Transfer Protocol) used for data transmission / reception on the Internet is HTTP redirect (hereinafter simply referred to as “redirect”). In the redirect, when a web page corresponding to a specific URL (Uniform Resource Locator) is moved, the specific URL is changed to a user who accesses the web page specified by the specific URL. This is a function that informs you.

  For example, when a user activates a browser to connect to the Internet, the browser accesses a URL of a set web page (hereinafter referred to as a home address). However, when the web page designated by the home address has been moved, the browser cannot display the web page designated by the home address. In this case, the web server notifies the browser that the set home address has been changed using the redirect function.

  On the other hand, the redirect function is being used for a purpose different from the notification of an address change because a relay device such as a router has the redirect function. For example, using a relay device having a redirect function, the administrator of the relay device can guide the user to a specific home page or display an advertisement on a browser. Patent Document 1 discloses a redirect system for guiding a user to a specific web page using a relay device having a redirect function.

  FIG. 12 is a configuration diagram of a redirect system disclosed in Patent Document 1. The redirect system shown in FIG. 12 includes a user browser 301, a gateway device 302, a redirect server 303, and a portal page 304.

In the redirect system shown in FIG. 12, the user of the browser 301 logs on to the gateway device 302. The browser 301 transmits a web page request A1 for requesting display of a specific web page to a web server requested by the user (not shown; hereinafter referred to as “origin server”). The gateway device 302 receives the web page request A1 and transfers the web page request A1 to the redirect server 303. In the redirect server 303, the URL of the redirect destination portal page 304 is set. The redirect server 303 creates a message A2 that redirects the transferred web page request A1 to the URL of the portal page 304. The gateway device 302 converts the message A2 into the message A3 and transmits it to the browser 301 like a redirect message created by the origin server. After receiving the message A3, the browser 301 transmits a web page request A4 to the portal page 304. The portal page 304 transmits the data A5 of the portal page 304 to the browser 301.
Special table 2003-513524 gazette

  However, in order to use the redirect function of the gateway device 302 in the conventional redirect system, the user needs to perform an operation of logging on to the gateway device 302. For this reason, the above-described conventional redirect system has a problem that a terminal that does not log on to the gateway device 302 cannot use the redirect function of the gateway device 302.

  Therefore, an object of the present invention is to provide a relay device that can use a redirect function without requiring a special operation by a user and does not limit data to be redirected.

  The present invention is directed to a relay device that relays communication between a network and a terminal, which has an HTTP redirect function and can be switched between an operating state and a stopped state of the HTTP redirect function. In order to achieve the above object, the relay apparatus according to the present invention includes a transmission / reception unit that transmits / receives a packet to / from a network and a terminal, and a packet received by the transmission / reception unit connects a packet transmitted by the terminal to the network in advance. In the case of a redirect request packet for requesting to be redirected to another terminal, an analysis unit that switches the HTTP redirect function to an operating state, a destination conversion unit, and a packet generation unit are provided.

  When the received packet is a redirect request packet for requesting that the packet transmitted by the terminal is redirected to another terminal, the analysis unit switches the HTTP redirect function to the operating state. When the HTTP redirect function is in operation, the destination conversion unit converts the destination address and destination port of the packet transmitted by the terminal to the address and port of another terminal, respectively, and the packet generation unit outputs the destination conversion unit. The redirected packet to be transmitted to another terminal is generated using the packet thus obtained.

  When the HTTP redirect function is switched to the activated state, the analysis unit preferably notifies the destination conversion unit and the packet generation unit that the HTTP redirect function has been switched to the activated state. In this case, it is preferable that the packet generator generates a redirect response packet that tells another terminal that the redirect function is in operation, and the packet transmitter transmits the redirect response packet to the other terminal.

  The destination conversion unit may convert the destination address and destination port of the packet transmitted by the terminal into the address and port of the terminal that is the transmission source of the redirect request packet.

  The relay apparatus may further include an encryption unit that encrypts a packet transmitted by the transmission / reception unit. Furthermore, you may provide the control button which switches the operation state and stop state of an HTTP redirect function.

  The relay apparatus may hold in advance the address and port of another terminal as a redirect destination. In this case, the relay device may switch the HTTP redirect function to the operating state when the communication status of the terminal matches a predetermined condition. In addition, when the terminal is connected to the network via the relay device, the packet generation unit may generate information such as an address of the relay device and a connection ID for connection to the network of the terminal as a self-information packet. When the self-information packet is generated, the transmission / reception unit preferably transmits it to a specific terminal at a predetermined time interval.

  As described above, according to the present invention, when a redirect request packet is received, the relay device activates the redirect function and redirects the packet received from the terminal to the terminal specified by the redirect request packet. Thereby, the user of the terminal can use the redirection function of the relay device without operating the relay device.

  The relay device according to the present invention can be used in a call center of an Internet service provider. When trouble occurs at the customer's home terminal, the packet is sent from the customer's home terminal with the redirection function of the relay device activated. By analyzing the transferred packet, it is possible to grasp the cause of the trouble at an early stage.

(First embodiment)
FIG. 1 is a diagram illustrating a configuration example of a redirect system using a relay device according to the first embodiment of the present invention. The redirect system shown in FIG. 1 includes a client device 10, a capture device 20, and a content server 30. The client device 10 includes a terminal 11 and a relay device 12. The capture device 20 includes a router 21 and a capture terminal 22. The terminal 11 is connected to the Internet 40 via the relay device 12. The capture terminal 22 contacts the Internet 40 via the router 21. The content server 30 is connected to the Internet 40.

  The terminal 11 is a content browsing terminal. The relay device 12 is a router having a redirect function. The redirect function of the relay device 12 can be switched between an operating state and a stopped state (hereinafter referred to as “ON / OFF”). The relay device 12 is not limited to a router, and may be an ADSL modem. The capture terminal 22 performs control of ON / OFF switching of the redirect function of the relay device 12 and the like. The content server 30 holds the content and transmits the content to the terminal 11 in response to a request from the terminal 11.

  FIG. 2 is a block diagram illustrating a configuration of the relay device 12. 2 includes a reception unit 121, a packet analysis unit 122, a destination conversion unit 123, a packet generation unit 124, an encryption unit 125, and a transmission unit 126.

  The receiving unit 121 receives a packet transmitted from the terminal 11 and the Internet 40. The packet analysis unit 122 determines the received packet. When the packet analysis unit 122 determines that the received packet is a packet that requests switching of the redirect function of the relay device 12 to ON (hereinafter referred to as “redirect request packet”), the packet analyzer 122 turns on the redirect function of the relay device 12. Switch to. Further, the packet analysis unit 122 notifies the destination conversion unit 123 and the packet generation unit 124 of the source address and source port of the redirect request packet as the redirect destination.

  An example of the redirect request packet is shown in FIG. The redirect request packet illustrated in FIG. 4 is transmitted from the capture terminal 22 to the relay device 12 and has a content instructing to redirect the packet transmitted from the terminal 11 to the capture terminal 22. In the following description, it is assumed that the redirect destination of the packet transmitted by the terminal 11 is the capture terminal 22.

  The redirect request packet shown in FIG. 4 includes a destination address part, a source address part, a destination port part, a source port part, and a redirect request message part. The transmission source address section and the transmission source port section store the address and port number of the transmission source (capture terminal 22) of the redirect request packet, respectively. The destination address part and the destination port part store the address and port number of the relay device 12. The redirect request message part stores a message instructing switching of the redirect function of the relay device 12 to ON.

  If the packet analysis unit 122 determines that the received packet is a packet requesting to switch off the redirect function of the relay device 12 (hereinafter referred to as “redirect end packet”), the packet analyzer 122 turns off the redirect function of the relay device 12. Switch to. The redirect end packet includes a redirect end message part instead of the redirect request message part of the redirect request packet. The redirect end message part stores a message instructing switching of the redirect function of the relay device 12 to OFF.

  When the redirect function of the relay device 12 is ON, the destination conversion unit 123 holds the redirect destination address and port. Also, the destination conversion unit 123 changes the destination address and destination port of the packet received from the terminal 11 to the redirect destination address and port. Even if the redirect function is ON, the destination conversion unit 123 changes the destination address and destination port of a packet received from a device other than the devices constituting the client device 10 (corresponding to the terminal 11 in FIG. 1). Not performed.

  When notified from the analysis unit 122 that the redirect function of the relay device 12 is ON, the packet generation unit 124 transmits a packet received from the terminal 11 to the redirect destination (hereinafter referred to as “redirect packet”). Is generated. An example of the structure of the redirect packet is shown in FIG.

  The redirect packet includes a destination address part, a source address part, a destination port part, a source port part, a destination address storage part, a destination port storage part, and a data part. The destination address part and the destination port part respectively store the address and port of the redirect packet transmission destination (capture terminal 22). The transmission source address section and the transmission source port section store the address and port of the relay device 12. The destination address storage unit and the destination port storage unit store the destination address and the destination port of the packet transmitted by the terminal 11, respectively. Thereby, when the redirect function of the relay device 12 is ON, the packet received from the terminal 11 is transferred to the capture terminal 22 as a redirect packet.

  When the packet analysis unit 122 switches the redirect function of the relay device 12 from OFF to ON, the packet generation unit 124 generates a redirect start response packet that reports that the redirect function of the relay device 12 has been switched ON. When the packet analysis unit 122 switches the redirect function of the relay device 12 from ON to OFF, the packet generation unit 124 generates a redirect end response packet that reports that the redirect function of the relay device 12 has been switched OFF.

  The encryption unit 125 encrypts the packet generated by the packet generation unit 124. The transmission unit 126 transmits the packet generated by the packet generation unit 124. For packet encryption, SSL (Secure Socket Layer), IPsec (Security Architecture for Internet Protocol), IP-VPN, or the like is used. Note that when the packet is not encrypted, the relay device 12 may not include the encryption unit 125.

  FIG. 3 is a block diagram showing the configuration of the capture terminal 22. The capture terminal 22 illustrated in FIG. 3 includes a reception unit 221, a display unit 222, a destination conversion unit 223, a packet generation unit 224, an encryption unit 225, and a transmission unit 226.

  The receiving unit 221 receives a packet. The display unit 222 displays the contents of the received packet. The destination conversion unit 223 converts the destination address of the received redirect packet into an address stored in the destination address storage unit. Further, the destination conversion unit 223 converts the destination port of the redirect packet into a port stored in the destination port storage unit.

  The packet generator 224 generates a redirect request packet and a transfer packet. A transfer packet is a packet that transfers a redirect packet to its original destination. An example of the structure of the transfer packet is shown in FIG. The transfer packet includes a destination address part, a source address part, a destination port part, a source address part, and a data part. The destination address portion and the destination port portion of the transfer packet store the address and port stored in the destination address storage portion and the destination port storage portion of the redirect packet, respectively. In the transmission source address part and the transmission source port part, the address and port of the capture terminal 22 that is the transmission source are stored, respectively.

  The encryption unit 225 encrypts a packet to be transmitted. Note that if the packet is not encrypted, the capture terminal 22 may not include the encryption unit 225. The transmission unit 226 transmits the encrypted packet. The data part stores data of the data part of the redirect packet.

Next, redirect processing performed in the redirect system shown in FIG. 1 will be described with reference to FIGS. FIG. 7 is a flowchart illustrating processing performed by the relay device 12.
FIG. 8 is a flowchart showing processing performed by the capture terminal 22.

  A process in which the relay apparatus 12 switches the redirect function from OFF to ON and redirects a packet transmitted from the terminal 11 to the capture terminal 22 will be described with reference to FIG. The relay device 12 determines whether a redirect request packet has been received (step S101). The relay device 12 switches the redirect function to ON, and stores the address and port of the source address part and source port part of the redirect request packet in the destination conversion unit 123 as a redirect destination (step S102). When receiving the redirect request packet, the relay device 12 generates a redirect start response packet and transmits it to the capture terminal 22 (step S103).

  The relay device 12 determines whether a packet has been received (step S104). When the received packet is a redirect end packet (step S105, Yes), the relay device 12 switches the redirect function to OFF (step S106). The relay device 12 transmits a redirect end response packet to the capture terminal 22 (step S107), and ends the process.

  The operation of the relay device 12 when the received packet is not a redirect end packet will be described. The relay device 12 determines whether the received packet is a packet that is transmitted from the terminal 11 and that requests transmission of content from the content server 30 (hereinafter referred to as “content request packet”) (step S108). If the received packet is a content request packet, the relay device 12 converts the address and destination port of the content request packet into the address and port of the capture terminal 22 that is the redirect destination (step S109). The relay device 12 generates a redirect packet based on the content request packet and transmits it to the capture terminal 22 (step S110). When the received packet is not a content request packet (No at Step S108), the relay device 12 transmits the received packet to the destination of the packet (Step S111).

  A process in which the capture terminal 22 controls the relay device 12 will be described with reference to FIG. The capture terminal 22 transmits a redirect request packet to the relay device 12 (step S201). The capture terminal 22 determines whether a redirect start response packet has been received from the relay device 12 (step S202). When receiving the redirect start response packet, the capture terminal 22 confirms whether an instruction to switch off the redirect function of the relay device 12 is received from the user of the capture terminal 22 (step S203). When the redirect function of the relay device 12 is turned off, the capture terminal 22 transmits a redirect end packet for turning off the redirect function of the relay device 12 to the relay device 12 (step S209). When the capture terminal 22 receives the redirect end response packet from the relay device 12 (step S210), the capture terminal 22 ends the process.

  When the redirect function of the relay device 12 is kept ON, the capture terminal 22 determines whether the received packet is a redirect packet (step S204). If the received packet is a redirect packet (step S205, Yes), the capture terminal 22 generates a transfer packet from the redirect packet and transmits it to the content server 30 (step S206). Note that the capture terminal 22 may store the redirect packet.

  If the received packet is not a redirect packet, the capture terminal 22 determines whether the received packet is a packet transmitted from the content server 30 (hereinafter referred to as “content packet”) (step S207). If the received packet is a content packet, the capture terminal 22 converts the destination address and port number of the content packet into the address and port of the terminal 11 and transmits them (step S208). Note that the capture terminal 22 may store the packet transmitted from the content server 30. FIG. 9 shows a processing sequence corresponding to the control described above.

  As described above, the relay device according to the first embodiment receives the redirect request packet from the external device, thereby turning on the redirect function and specifying the packet transmitted from the terminal connected to the relay device. Forward to the redirected destination. For this reason, the relay device according to the present embodiment can use the redirect function of the relay device without performing an operation such as a user logging on to the relay device. In addition, the relay device according to the present embodiment can redirect all terminals connected to the relay device.

  The redirect destination of the relay device 12 has been described as the capture terminal 22, but the redirect destination may not be the capture terminal 22. In this case, the redirect request packet includes a redirect address part and a redirect port part that store a redirect destination address and port, respectively.

  In the first embodiment, the client device 10 includes one terminal. However, the number of terminals may be two or more. When there are two or more terminals, the redirect request packet includes information on the address and port of the terminal that requests the redirect. In this case, the relay apparatus holds information on the terminal that performs redirection (for example, the MAC address of the terminal). When receiving the packet of the terminal that performs redirection, the relay device 12 generates a redirection packet and transmits it to the capture terminal 22.

  In addition, the redirect system according to the first embodiment of the present invention can be applied to a call center system of an Internet service provider (ISP). When the redirect system shown in FIG. 1 is applied to a call center, the client device 10 corresponds to a customer's home computer. The capture device 20 is installed in a call center.

  Consider a case where a trouble occurs such that the client device 10 cannot download the content of the content server 30. In this case, the customer informs the call center that a problem has occurred. The call center operator operates the capture terminal 22 to transmit a redirect request packet to the relay device 12 of the client device 10. As a result, the redirection function of the relay device 12 of the client device 10 is turned on. In this state, the capture terminal 22 captures packets transmitted and received by the terminal 11. The operator grasps the problem of the client device 10 by analyzing the captured packet. Possible problems include, for example, a relay device setting error or content server down. In this way, the operator can grasp the cause of the trouble at the customer's house while in the call center, so that the trouble can be resolved at an early stage.

  Further, the relay device 12 may further include a button or the like as an instruction unit for switching the HTTP redirect function ON / OFF. As a result, the user of the client device 10 can directly switch on / off the redirect function of the relay device 12.

(Second Embodiment)
The relay apparatus according to the second embodiment of the present invention has the configuration shown in FIG. 2 and is used in the redirect system shown in FIG. The difference from the relay device 12 according to the first embodiment is that the relay device 12 according to the present embodiment automatically switches ON / OFF of the redirect function. Hereinafter, the redirection system according to the present embodiment will be described focusing on these different points.

  In the relay apparatus 12, the destination conversion unit 123 holds in advance the address and port of the capture terminal 22 that is the redirect destination. The packet analysis unit 122 switches the redirect function to ON and redirects the packet transmitted from the terminal 11 to the capture terminal 22 when the communication status of the terminal 11 matches a predetermined condition.

  FIG. 10 is a flowchart for explaining the operation of the relay device 12 according to the second embodiment. Hereinafter, the operation of the relay device 12 according to the second embodiment will be described with reference to FIG. In the relay device 12, the packet analysis unit 122 monitors packets transmitted and received by the terminal 11, and determines whether a problem occurs in the communication of the terminal 11 (step S301). When a problem occurs in the communication of the terminal 11, the relay device 12 inquires of the user whether or not the redirect function of the relay device 12 may be switched on (step S302). When the user consents to switch the redirect function to ON, the relay device 12 switches the redirect function to ON (step S303). The relay device 12 redirects the packet transmitted by the terminal 11 to the capture terminal 22 (step S304).

  Possible problems that may occur in the terminal 11 include a case where the terminal 11 receives an error packet and a case where a response packet corresponding to the packet transmitted by the terminal 11 is not received within a certain time. For example, the DNS server setting of the terminal 11 may be incorrect. If the setting of the DNS server is incorrect, the terminal 11 cannot receive a response from the DNS server. When the terminal 11 accesses the content server 30 in this state, the terminal 11 cannot receive the content packet from the content server 30. By detecting such a situation, the relay device 12 inquires the user to switch on the redirect function.

  As described above, the relay apparatus according to the second embodiment redirects the packet transmitted by the terminal to the capture terminal by automatically switching on the redirect function according to the communication status of the terminal. As a result, when the redirect system shown in the present embodiment is used for a call center, the call center can collect information on the terminal in which the problem has occurred earlier than the customer reports the problem to the ISP call center or the like. It becomes. Therefore, it is possible to solve the problem occurring in the customer's terminal more quickly.

  Further, when there are a plurality of terminals connected to the relay apparatus 12, the relay apparatus 12 may redirect only the specific terminal where the problem has occurred to the capture terminal 22. In this case, the relay device 12 may hold information on the terminal where the problem has occurred (for example, the MAC address of the terminal). Thereby, the relay apparatus 12 can redirect only the packet received from the terminal in which the problem has occurred to the capture terminal 22.

(Third embodiment)
The relay device according to the third embodiment of the present invention has the configuration shown in FIG. 2 and is used in the redirect system shown in FIG. The difference from the relay device 12 according to the first embodiment is that the relay device 12 according to the present embodiment transmits information such as its own address to the capture terminal 22. Hereinafter, the relay apparatus 12 according to the present embodiment will be described focusing on the different points.

  In the relay device 12, the destination conversion unit 123 holds the address and port of the capture terminal 22 that is a redirect destination in advance. The capture terminal 22 further includes a storage unit (not shown) such as a database in order to hold information of the relay device 12.

  FIG. 11 is a flowchart for explaining the operation of the redirect system according to the third embodiment. The relay device 12 determines whether the client device 10 is connected to the Internet 40 (step S401). When the client device 10 is connected to the Internet 40, the packet generator 124 of the relay device 12 transmits a packet (hereinafter referred to as “own information packet”) in which information such as an address assigned to itself and a network connection ID is stored. And transmitted to the capture terminal 22 (step S402). When receiving the own information packet, the capture terminal 22 associates the address of the relay device 12 and the network connection ID included in the own information packet and holds them in a storage unit or the like.

  As described above, when the relay device 12 according to the third embodiment is connected to the network, the relay device 12 transmits its own address and network connection ID to the capture terminal. The relay device 12 may transmit a domain name corresponding to its own address instead of its own address. As a result, when the redirect system shown in this embodiment is used for a call center, the call center sends a packet transmitted by the terminal 11 based on customer information (customer name, etc.) when the customer reports the occurrence of a problem. Can be immediately redirected to the capture terminal 22. Therefore, it is possible to solve the problem occurring in the customer's terminal more quickly.

  Note that when the address of the relay device 12 is changed, the relay device 12 may transmit its own information packet to the capture terminal 22 again. As a result, the capture terminal 22 can transmit a redirect request packet to the relay device 12 even when the address of the relay device 12 is changed. Further, the relay device 12 may transmit its own information packet to the capture terminal 22 at regular intervals.

  The relay device having a redirect function and an access method thereof according to the present invention are useful as a relay device that requires the user to use the redirect function without performing a special operation.

The figure which shows the structural example of the redirect system using the relay apparatus which concerns on 1st Embodiment. Block diagram showing the configuration of the relay device 12 Block diagram showing the configuration of the capture terminal 22 The figure which shows an example of the structure of a redirect request packet The figure which shows an example of the structure of a redirect packet The figure which shows an example of the structure of a transfer packet A flowchart showing processing performed in the relay device 12 A flowchart showing processing performed in the capture terminal 22 Processing sequence diagram of redirect system The flowchart explaining operation | movement of the relay apparatus 12 which concerns on 2nd Embodiment. The flowchart explaining operation | movement of the redirect system which concerns on 3rd Embodiment. Configuration diagram of a conventional redirect system

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Client apparatus 11 Terminal 12 Relay apparatus 20 Capture apparatus 21 Router 22 Capture terminal 121,221 Reception part 122 Packet analysis part 123,223 Destination conversion part 124,224 Packet generation part 125,225 Encryption part 126,226 Transmission part 222 Display part

Claims (9)

A relay device that relays communication between a network and a terminal, having an HTTP redirect function and capable of switching between an operating state and a stopped state of the HTTP redirect function.
A transmission / reception unit for transmitting and receiving packets to and from the network and the terminal;
When the packet received by the transmission / reception unit is a redirect request packet requesting that a packet transmitted from the terminal is redirected to another terminal connected to the network in advance, the HTTP redirect function is switched to an operating state. An analysis unit;
A destination conversion unit that converts a destination address and a destination port of a packet transmitted by the terminal to an address and a port of the other terminal, respectively, when the HTTP redirect function is in an active state;
A relay apparatus comprising: a packet generation unit that generates a redirect packet to be transmitted to the other terminal using a packet output from the destination conversion unit when the HTTP redirect function is in operation. When the HTTP redirect function is switched to the operating state, the analysis unit notifies the packet generation unit that the HTTP redirect function has been switched to the operating state.
The packet generation unit generates a redirect start response packet that tells the other terminal that the redirect function is in operation,
The relay apparatus according to claim 1, wherein the packet transmission unit transmits the redirect start response packet to the other terminal.   The relay device according to claim 1, further comprising an encryption unit that encrypts a packet transmitted by the transmission / reception unit.   The destination conversion unit converts a destination address and a destination port of the packet transmitted by the terminal into an address and a port of a terminal that is a transmission source of the redirect request packet. Relay device.   The relay device according to claim 1, further comprising a control button for switching between an operating state and a stopped state of the HTTP redirect function. When the communication status of the terminal matches a predetermined condition,
The analysis unit switches the HTTP redirect function to an operating state,
2. The destination conversion unit according to claim 1, wherein the destination conversion unit converts a destination address and a destination port of the packet transmitted by the terminal into an address and a port of the other terminal held in advance as a redirect destination. Relay device. When the terminal is connected to the network via the relay device,
The packet generation unit generates a self-information packet for indicating to the other terminal that holds the address of the relay device and the ID for connecting to the network of the terminal in advance as a redirect destination,
The relay apparatus according to claim 1, wherein the transmission / reception unit transmits the self-information packet to the other terminal.   The relay apparatus according to claim 7, wherein the transmission / reception unit transmits the self-information packet to the specific terminal at a predetermined time interval. A method of redirecting a packet transmitted from a terminal connected to a network using HTTP,
Sending and receiving packets to and from the network and the terminal;
When the packet received by the transmission / reception unit is a redirect request packet requesting that a packet transmitted from the terminal is redirected to another terminal connected to the network in advance, the HTTP redirect function of the relay device is activated. A step to switch to the state;
Converting a destination address and a destination port of a packet transmitted by the terminal to an address and a port of the specific terminal, respectively, when the HTTP redirect function is in an active state;
And a step of generating a redirect packet for redirecting to the specific terminal using a packet in which a destination address and a destination port are converted when the HTTP redirect function is in an operating state.

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