JP5385269B2 - IPv6-IPv4 conversion method and apparatus for improving control server performance - Google Patents

Description

  The present invention relates to a server-based IPv6 over IPv4 transition method and apparatus, and more particularly, to a control server-based IPv6-IPv4 transition method and apparatus for improving the performance of a control server.

  In general, the control server-based IPv6-IPv4 conversion method allows a service terminal to register its service with the control server and request the address-converted information of the terminal to be communicated. This is a method of creating a control tunnel to (also called RFC2529, RFC3053). By using the generated control tunnel, the IPv6 terminal can request the IPv4 address that can communicate with the IPv6 address of the receiving terminal (the other party) from the control server, and acquire the IPv4 address. Such information is managed by transmitting a tunnel creation request message to the control server and registering itself in the control server when each terminal first creates a control tunnel.

  Meanwhile, conventional methods for IPv6-IPv4 conversion include a translation method and a server-based conversion method.

  The above-described conversion method is a method that allows IPv6 and IPv4 to be linked by providing an address converter between two different versions of an IP network. In such a method, there is a problem of extensibility that address translation must be performed for all packets.

  The server-based conversion (IPv6-IPv4 conversion) method described above can be divided into Tunnel Broker (RFC 3053), Teredo, and ISATAP (Intra-Site Automatic Tunnel Addressing Protocol).

  The tunnel broker is a device for relaying a tunnel, and a terminal in the IPv4 network generates a tunnel to a gateway between the IPv4 network and the IPv6 network. Here, the generation of the control tunnel means that a terminal located in the IPv4 network registers its own information in the server in order to communicate with the terminal in the IPv6 network, and acquires information to communicate with the other party. to enable.

  Teledo then uses a method similar to the tunnel broker method described above, but is not officially assigned by the Internet Assigned Numbers Authority (IANA). However, in such a method, a prefix for teled is defined separately, and the protocol is designed to include a possibility that a terminal in the IPv4 network is under NAT (Network Address Translation). However, although the tunnel broker method described above describes only the general structure of RFC3063, since it is actually implemented in consideration of address translation and the like, there is not much difference between the teled and the tunnel broker method. Further, since Teledo can extract an IPv4 address from an IPv6 address, it can directly communicate with each other without using a device such as a teledo relay, which is a difference between the two methods. It is.

  On the other hand, the ISATAP is a terminal for providing communication between a terminal existing in an IPv4 intranet and another terminal in the intranet, or a terminal existing in an IPv6 public network connected to the intranet. Or an automatic tunneling method between a terminal and a router. Such a method is a protocol that has not yet been standardized by RFC, but is basically provided by Microsoft's Windows (registered trademark) operating system. The ISATAP address is :: 0: 5EFE: w. x. y. z interface identifier, where w. x. y. z is an IPv4 address. The ISATAP interface identifier can be combined with a valid 64-bit prefix for an IPv6 unicast address.

  As described above, the ISATAP address includes an IPv4 source address and a destination address (destination address) used to transmit the ISATAP traffic through the IPv4 network, such as an IPv4 compatible address, a 6 over 4 address, and a 6 to 4 address. ) Is included.

  However, the above-described general IPv6-IPv4 conversion method has a problem in that when the number of service terminals increases, the number of control tunnels increases, and the burden on tunnel management of the control server is increased. This is because the control server measures the lifetime of each control tunnel and deletes or maintains the control tunnel when the service of the terminal ends. Furthermore, the control server can transfer the transmission of data to the communicating terminals via the control tunnel. As described above, maintenance of the control tunnel and transfer of data through the control tunnel cause a decrease in server performance.

Korean Patent Publication No. 2006-0111810

  Accordingly, an object of the present invention is to easily manage a control tunnel regardless of an increase in the number of service terminals, and to enable data forwarding through the tunnel to improve the performance and service stability of the control server. An IPv6-IPv4 conversion method and apparatus are provided.

  In order to achieve the above-described object of the present invention, according to one aspect of the present invention, in a router connected between an IPv6 terminal and a control server, IPv6-IPv4 conversion is performed in order to improve the performance of the control server. And a method for receiving a tunnel creation request message from the control server operating in response to a tunnel creation request of the IPv6 terminal, and a tunnel creation response message for the received tunnel creation request message. Transmitting to the IPv6 terminal via the control server, and performing IPv6-IPv4 conversion via the tunnel generated by the IPv6 terminal that has received the tunnel generation response message. And

  According to another aspect of the present invention for achieving the above-described object of the present invention, in a control server connected between an IPv6 terminal and a plurality of routers in order to improve the performance of the control server, the control server A method of performing IPv6-IPv4 conversion to improve its own performance is provided, which includes receiving a tunnel creation request message from the IPv6 terminal existing in the IPv4 network via the IPv4 network; Selecting an edge router from registered routers to generate a tunnel between the terminal router and the IPv6 terminal; and transmitting a tunnel generation request message to the selected terminal router And a tunnel generation corresponding to the tunnel creation request message from the selected end router. Receiving a successful response message and transmitting the received tunnel creation response message to the IPv6 terminal; receiving the tunnel creation response message and sending the message to the termination via the tunnel created from the IPv6 terminal; Receiving the IPv6-IPv4 converted message from the terminal router when transmitted to the router.

  According to another aspect of the present invention for achieving the object of the present invention, an IPv6 terminal is connected between an IPv6 terminal and a control server and performs IPv6-IPv4 conversion. An IPv6 terminal interface unit configured to interface with the IPv6 terminal to transmit / receive a message and the apparatus is selected by the control server as a terminal router for tunnel setting and receives a tunnel creation request message from the control server Then, a tunnel creation response message including information on the device itself is transmitted to the control server, and when the IPv6 terminal receives the tunnel creation response message from the control server and creates a tunnel, it performs IPv6-IPv4 conversion. , Transfer controller and above A routing table for registering routing information included in the tunnel generation request message, and a control server interface unit that interfaces with the control server via IPv6 when receiving a message from the IPv6 terminal via the generated tunnel It is characterized by that.

  As described above, the present invention can easily manage the control tunnel regardless of the increase in the number of service terminals by generating the control tunnel between the terminal router selected by the control server and the terminal. Data transfer is possible. Therefore, it is possible to prevent the load on the control server caused by setting a control tunnel to the control server for all terminals, improve the performance of the control server and increase the stability of the service, and increase the number of subscribers. There is an effect that the expandability of the service due to the increase can be guaranteed.

FIG. 3 is a diagram illustrating a tunnel configuration through a termination router in a server-based IPv6-IPv4 conversion system according to an embodiment of the present invention. It is a figure which shows the detailed structure of the termination | terminus router by one Embodiment of this invention. FIG. 3 is a diagram illustrating a procedure for setting a tunnel through a termination router in a server-based IPv6-IPv4 conversion system according to an embodiment of the present invention; FIG. 6 illustrates operations performed by a control server to determine a router that creates a tunnel from a terminal according to an embodiment of the present invention. FIG. 4 is a diagram illustrating a tunnel request message transmitted from a control server of a server-based IPv6-IPv4 conversion system according to an exemplary embodiment of the present invention to a router. FIG. 6 is a diagram illustrating a tunnel response message transmitted from a tunnel termination router of a server-based IPv6-IPv4 conversion system according to an exemplary embodiment of the present invention to a control server. FIG. 6 is a diagram illustrating a control message packet processing operation for performing IPv6-IPv4 conversion according to an embodiment of the present invention. FIG. 3 is a diagram illustrating data transfer in a server-based IPv6-IPv4 conversion system according to an exemplary embodiment of the present invention. FIG. 5 is a diagram illustrating an operation of confirming a connection between a terminal router and a control server in a server-based IPv6-IPv4 conversion system according to an embodiment of the present invention.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals refer to like elements throughout the specification. In the description of the present invention, specific descriptions of known functions or configurations may be omitted so as not to disturb the understanding of the present invention.

  FIG. 1 is a diagram illustrating a server-based IPv6-IPv4 conversion system including a tunnel termination router and a server according to an embodiment of the present invention.

  Referring to FIG. 1, an IPv6-IPv4 conversion system includes a plurality of terminals 101, a plurality of routers 102 for forming a tunnel (IPv6-IPv4 tunnel; hereinafter referred to as a control tunnel), and a tunnel from a specific terminal 101. In response to the generation request, to select a terminal router 102 for an available tunnel, and to transmit / receive a message to / from the terminal 101 via the selected terminal router 102 Control server 103.

  The terminal 101 is an IPv6 terminal, requests the control server 103 to generate a tunnel, and generates a control tunnel using the terminal router 102 according to the result of the request.

  The terminal router 102 can be configured as a dual stack router capable of processing both IPv4 data and IPv6 data. Further, the terminal router 102 communicates with the terminal 101 that requests tunnel generation via a control tunnel, and can transmit an IPv4 / IPv6 message (tunnel generation request message) so as to transmit a transmission control protocol (TCP). protocol) to perform IPv6 communication with the control server 103. Further, when the terminal router 102 attempts the first connection with the control server 103, the terminal router 102 transmits a registration request message (Init Msg.) To the control server 103 to inform the existence of the terminal router itself. Transmit the number of tunnels currently set up and the number of tunnels that can be added to set up.

  The control server 103 adds (registers) new routers according to the increase in the number of IPv6 terminals 101, stores information on the added routers, and periodically checks (checks) the status information on the added routers. Then, it is recognized whether or not the added router can be used. Then, the control server 103 determines a terminal router for forming a tunnel with the terminal 101 from a plurality of registered routers according to the number of tunnels and availability.

  In the IPv6-IPv4 conversion system having the above-described configuration, the structure of the terminal router 102, which is a device for switching communication between the terminal 101 and the control server 103 via the generated tunnel, will be described with reference to FIG. More specific description will be given with reference to FIG.

  FIG. 2 is a diagram illustrating a detailed configuration of a termination router according to an embodiment of the present invention.

  Referring to FIG. 2, the terminal router 102 includes an IPv6 terminal interface 111, a forwarding controller 112, a routing table 113, and a control server interface 114.

The IPv6 terminal interface 111 interfaces with the terminal 101 via the IPv4 network, and sets up a tunnel with the terminal 101 in order to send and receive messages.

  The transfer control unit 112 is selected by the control server 103 as a terminal router for setting a tunnel, receives a tunnel generation request message from the control server 103, and transmits information included in the tunnel generation request message received from the control server 103. Use to create a tunnel interface. When the terminal 101 receives the tunnel generation request message from the control server 103 and generates a tunnel, the transfer control unit 112 switches communication between the terminal 101 and the control server 103 via the generated tunnel (IPv6 -IPv4 conversion). Further, the transfer control unit 112 controls the transfer of IPv6 data, notifies the control server 103 of its existence for tunnel generation, and transmits its own state information and information registered in the routing table 113. Here, the state information includes the number of tunnels currently set in the terminal router 102 and the number of tunnels that can be added for setting.

  The routing table 113 registers routing information (such as IPv4 and IPv6 addresses) related to the tunnel interface generated by the transfer control unit 112.

  The control server interface 114 performs an interface for communication with the control server 103 connected via TCP. When a message is received from the terminal 101 via the generated tunnel, the control server interface 114 interfaces with the control server 103 via IPv6. I do.

  Further, a process for setting a tunnel between the IPv6 terminal and the control server via the router will be described in detail with reference to FIG.

  FIG. 3 is a diagram illustrating a process for setting a tunnel through a router in a server-based IPv6-IPv4 conversion system according to an embodiment of the present invention.

  Referring to FIG. 3, in step 201, the terminal 101 transmits a tunnel creation request message to the router 102 via the IPv4 network. Then, the router 102 transmits a tunnel generation request message to the control server 103 by message relay. Here, since the control tunnel (referred to as IPv6-IPv4 tunnel) from the terminal 101 has not yet been generated and is requested with the IPv4 message type, the tunnel generation request message is transmitted with the IPv4 message type.

  Further, in step 202, the control server 103 that has received the tunnel creation message stores information related to the terminal (NAT, Port, IPv4 private address, IPv4 global address, IPv6 address, etc.), and the current number of tunnels, A tunnel termination router 102 for substantially generating a control tunnel is selected from a plurality of routers 102 in consideration of the utility of the tunnel.

  Therefore, the selected terminal router 102 receives the tunnel generation request message from the control server 103 at step 203, and the selected terminal router 102 transmits the tunnel generation response message to the control server 103 at step 204. At this time, the selected terminal router 102 generates a tunnel interface by using information included in the tunnel generation request message, and registers routing information corresponding to the tunnel interface in the routing table 113.

  Therefore, in step 205, the terminal router 102 transmits the tunnel generation response message including the received information for tunnel generation to the terminal 101 via the control server 103. Thereafter, in step 206, the terminal 101 generates a control tunnel to the terminal router 102 by using the information included in the tunnel generation response message. Here, the terminal 101 requests the control server 103 for information related to the receiving terminal with which it communicates via the generated control tunnel. That is, the terminal 101 sets a control tunnel in the router 102, and the router 102 communicates with the control server 103 via IPv6.

  The operation of the control server in the tunnel setting procedure will be described more specifically with reference to FIG.

  FIG. 4 is a diagram illustrating operations performed by the control server to determine a router that creates a tunnel from a specific terminal according to an embodiment of the present invention.

  Referring to FIG. 4, when a new router requests registration in step 301, the control server 103 adds (registers) the new router, and in step 302, the control server 103 transmits the tunnel set by the new router. Stores information about the number or type of tunnel available and sets up the connection. By registering as many new routers as necessary with the control server 103 as the number of service terminals increases, an appropriate router can be selected from among the registered routers as a terminal router 102 for generating a tunnel. It becomes possible.

  Next, when the control server 103 receives the tunnel generation request message from the terminal 101 in step 303, the control server 103 retrieves the terminal router information stored in advance in step 304 and extracts the terminal 101 from the registered router. Select a terminal router to create a tunnel with. At this time, the control server 103 determines the number of tunnels per router, the availability of tunnels, and the amount of data used for the tunnels, and selects an appropriate router (with the least burden).

  Thereafter, in step 305, the control server 103 transmits a tunnel creation request message to the selected terminal router 102 to instruct to set a tunnel, and in step 306, the selected terminal router 102 responds to the tunnel setting. A tunnel creation response message including the result is received, and the received tunnel creation response message is transmitted to the terminal 101 in step 307. Here, the structure of the tunnel generation request message is as shown in FIG. The tunnel creation request message includes fields of an IP header, cmd, Type, Nat, lifetime, an IPv4 address of the terminal (called CoA (Care of Address)), and an IPv6 address of the terminal. When the terminal belongs to CoA and Nat The tunnel creation request message further includes a private CoA field. Here, the cmd field indicates an operation, the Type field indicates a tunnel type (for example, IPv6-IPv4, etc.), and NatPort indicates whether the terminal belongs to a nut.

  The structure of the tunnel creation response message is as shown in FIG. 6 and includes an IP header, cmd, result, Reason, and an IPv6 address field of the terminal. Here, the Result field represents the tunnel setting result, and the Reason field represents the cause of the failure.

  An operation for generating a control tunnel in the IPv6-IPv4 system and processing a control message packet transmitted / received through the generated control tunnel will be specifically described with reference to FIG.

  FIG. 7 is a diagram illustrating a processing operation of a control message packet for IPv6-IPv4 conversion according to an embodiment of the present invention.

  Referring to FIG. 7, in step 401, the control server 103 receives a control tunnel generation request message from the terminal 101 via IPv4. Accordingly, in step 402, the control server 103 transmits a control tunnel generation request message to the router 102, receives a control tunnel generation response message from the router 102, and then transmits the control tunnel generation response message to the terminal 101.

  The terminal 101 receives the control tunnel generation response message and generates a control tunnel. Thereafter, in step 405, the terminal 101 requests the control server 103 for information on a receiving terminal to be communicated using the generated control tunnel. At this time, an IPv6-IPv4 control tunnel is used. In this case, the IPv4 header includes information including the router 102 arranged at the end of the tunnel as a destination, and the IPv6 header includes information including the control server 103 as a destination.

  Therefore, in step 406, since the IPv4 header included in the information request message indicates the router 102, the router 102 performs an IPv6 lookup and sends the information request message of the receiving terminal including the looked up information. To the control server 103. Next, in step 407, the terminal router 102 receives a response message to the information request from the control server 103. Accordingly, in step 408, the router 102 transmits a response message to the information request having the terminal 101 as the destination via the control tunnel.

  The data transfer between the transmitting terminal and the receiving terminal using the generated control tunnel as described above is as illustrated in FIG. Here, since IPv6 routing information is set in the router at the time of generating the control tunnel, data transfer using the control tunnel is possible. Referring to FIG. 8, a first control tunnel is generated between the transmission terminal 101 and the terminal router 102, and a packet transferred through the first control tunnel transmits data in a payload interval. Information of the receiving terminal is included in the IPv6 and IPv4 headers, and information of the router 102 is included in the IPv4 header. Further, a second control tunnel is generated between the router 102 and the receiving terminal 104, and a packet transferred through the second control tunnel includes data in the payload section and is received in the IPv6 header and the IPv4 header. Contains terminal information.

  As illustrated in FIG. 9, the router 102 and the control server 103 periodically check each other's state using a TCP connection.

  Referring to FIG. 9, when the router 102 tries to connect to the control server 103 in step 501, the router 102 first transmits a registration request message (Init Msg.) To the control server 103. And information on the number of tunnels set in the router 102 itself and the number of tunnels (usable amount) that can be added for setting. Thereafter, the control server 103 uses the received information to check whether or not the terminal router 102 is usable (serviceable state), and terminates the registration request response message including its own information (address). Transmit to the router 102.

  Therefore, the router 102 receives the registration request response message from the control server 103 in step 502, and establishes a connection with the control server 103 in step 503.

  Thereafter, in step 504, the router 102 receives a status information request message for periodic status management from the control server 103. In step 505, the router 102 transmits a status information response message to the control server 103. As a result, the control server 103 can periodically check whether the router 102 is available. At this time, if there is no response within a predetermined time, the control server 103 recognizes that the terminal router 102 is not a usable router and does not transmit the tunnel generation message.

  While the invention has been particularly shown and described in connection with exemplary embodiments, it will be understood that various modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Those skilled in the art will appreciate that this is possible.

Claims (9)

A method for performing IPv6-IPv4 conversion in a router connected between an IPv6 terminal on an IPv4 network and a control server, wherein the control server and the router are dual capable of both IPv4 communication and IPv6 communication Configured as a stack,
Receiving a tunnel creation request message corresponding to the tunnel creation request of the IPv6 terminal from the control server through an IPv4 network, wherein the tunnel creation request message is registered in advance with the control server by the control server; Based on the number of tunnels currently set in each router, the number of tunnels that can be additionally set for each router, and the amount of data used for the tunnel, Responsive to being selected as a terminating router to be used to set up a tunnel with the IPv6 terminal, transmitted to the router;
Transmitting a tunnel creation response message to the received tunnel creation request message to the control server;
The tunnel creation response message is transmitted from the control server to the IPv6 terminal, and a tunnel is generated by the IPv6 terminal based on the tunnel creation response message to terminate the router as a termination router. Receiving the message from the IPv6 terminal, performing IPv6-IPv4 conversion on the received message, wherein the step of performing IPv6-IPv4 conversion includes an IPv6 header from the IPv6 terminal through the generated tunnel. When a message including information and IPv4 header information is received, it is confirmed that the received message is destined for the end router itself via the information of the end router in the IPv4 header information, and the received information is received via IPv6 communication. Message is So that it can be fed, characterized in that it comprises removing information edge router in the IPv4 header information from the received message, IPv6-IPv4 conversion server basis for improving the performance of the control server Method.   The server infrastructure for improving the performance of the control server according to claim 1, further comprising a step of registering routing information included in the tunnel generation request message received from the control server in a routing table. IPv6-IPv4 conversion method.   The router further includes a step of periodically transmitting state information indicating the number of tunnels set in the router and the number of tunnels that can be additionally set to the router to the control server. A server-based IPv6-IPv4 conversion method for improving the performance of the control server according to claim 1. In a control server connected to a plurality of routers registered in advance, the plurality of routers are located between the control server and an IPv6 terminal on the IPv4 network, and IPv6 is used to improve the performance of the control server itself. A method executed for performing IPv4 conversion, wherein the control server and the plurality of routers are configured as a dual stack capable of both IPv4 communication and IPv6 communication, and the control server includes the plurality of routers; The status information received from each of the routers is configured so that the status information of each router includes the number of tunnels set for each router and the number of tunnels that can be additionally set for each router, The method
Receiving a tunnel creation request message from the IPv6 terminal via the IPv4 network;
Among the plurality of routers registered in advance with respect to the control server, the number of tunnels set in each router included in the state information, the number of tunnels that can be additionally set for each router, and the tunnel Selecting a terminating router to be used to set up a tunnel with the IPv6 terminal based on the amount of data used for
Transmitting the tunnel creation request message received from the IPv6 terminal to the selected terminal router;
Receiving a tunnel creation response message for the tunnel creation request message from the selected terminal router, and transmitting the tunnel creation response message to the IPv6 terminal;
The IPv6 terminal that has received the tunnel generation response message generates a tunnel between the IPv6 terminal and the terminal router, and a message is transmitted from the IPv6 terminal to the terminal router through the generated tunnel. A server for improving the performance of the control server, comprising: when the message is IPv6-IPv4 converted at the terminal router, receiving the converted message from the terminal router via IPv6 communication. Platform IPv6-IPv4 conversion method. The server-based IPv6-IPv4 conversion method for improving the performance of a control server according to claim 4 , further comprising the step of registering a new router added to the IPv4 network. Registering the new router comprises:
Receiving from the new router a registration request message including status information indicating the number of tunnels set in the new router and the number of tunnels that can be additionally set for the new router;
Checking whether the new router is available by using the received status information;
Setting up a connection with the new router by using the received status information when the new router is in an available state;
Transmitting a registration response message to the registration request message to the new router;
The method for improving the performance of the control server according to claim 5 , further comprising a step of transmitting and receiving a message for periodically checking status information of the new router to and from the new router. Server-based IPv6-IPv4 conversion method. The performance of the control server according to claim 4 , further comprising the step of deleting the generated tunnel between the terminating router and the IPv6 terminal after a predetermined time period set in advance. Server-based IPv6-IPv4 conversion method for improvement. A router for performing IPv6-IPv4 conversion, connected between an IPv6 terminal on an IPv4 network and a control server, wherein the control server and the router are
The router is configured as a dual stack capable of both IPv4 communication and IPv6 communication.
An IPv6 terminal interface for interfacing with the IPv6 terminal via an IPv4 network and setting a tunnel with the IPv6 terminal;
Among the plurality of routers registered in advance with the control server by the control server, the number of tunnels currently set in each router, the number of tunnels that can be additionally set for each router, and the number of tunnels Based on the amount of data used, in response to the router being selected as a termination router for setting up a tunnel with the IPv6 terminal, tunnel generation in response to a tunnel generation request of the IPv6 terminal from the control server When the request message is transmitted through the IPv4 network, a tunnel generation response message for the tunnel generation request message is generated and transmitted to the control server, and the tunnel generation response message is transmitted from the control server to the IPv6 terminal. The tunnel creation response message is sent by the IPv6 terminal. The router tunnels the end router is generated based on the over-di, upon receiving a message from the IPv6 terminal through the generated tunnel, perform IPv6-IPv4 conversion for the message, and the transfer control unit,
A routing table for registering routing information included in the tunnel generation request message received from the control server;
When the message is received from the IPv6 terminal via the generated tunnel, the control server interface unit interfaces with the control server via IPv6 communication, and the transfer control unit includes the generated tunnel. When receiving a message including IPv6 header information and IPv4 header information from the IPv6 terminal via the IPv6 terminal , confirm that the received message is addressed to the terminating router itself via the information of the terminating router in the IPv4 header information, It is configured to perform the IPv6-IPv4 conversion by removing terminal router information in the IPv4 header information from the received message so that the received message can be transmitted via IPv6 communication. A router characterized by that. The transfer control unit periodically transmits state information indicating the number of tunnels set in the router and the number of tunnels that can be additionally set to the router to the control server. The router according to claim 8 .

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