KR100705386B1 - Method for communicating mobile node of the mobile ???4 network and corresponding node of the ???6 network - Google Patents

Abstract

The present invention relates to network communication, and more particularly, to a communication method for delivering binding information of a mobile node to a corresponding node of an IPv6 network communicating with a mobile node of a mobile IPv4 network.

The communication method according to the present invention is a mobile node when a mobile node moves to an external agent through a router in a communication network in which a mobile node of a mobile IPv4 network and a corresponding node of an IPv6 network are connected through a router. Converts the IPv4 format registration request message to an IPv6 format binding update message, and in response to the binding update message, converts the IPv6 format binding acknowledgment message generated by the corresponding node to an IPv4 format registration response message,

Convert the IPv4 header and the mobile IPv4 header of the registration request message into the IPv6 header and the mobile IPv6 header of the binding update message, respectively, and convert the IPv6 header and the mobile IPv6 header of the binding acknowledge message into the IPv4 header and the mobile IPv4 header of the registration response message, respectively. .

Description

Method for communicating mobile node of the mobile IP4 network and corresponding node of the IP6 network

1 illustrates a system for describing a process of registering new binding information of a mobile node in a mobile IPv4 network.

2 illustrates a system for explaining a process of registering new binding information of a mobile node in a mobile IPv6 network.

3 illustrates a communication path between a mobile node of a mobile IPv4 network and a corresponding node of an IPv6 network.

4 illustrates a system for explaining a process of transferring binding information of a mobile node between a mobile node of a mobile IPv4 network and a corresponding node of an IPv6 network according to an embodiment of the present invention.

5 is a flowchart illustrating a process of converting a registration request message into a binding update message in the router BR 430 according to an embodiment of the present invention in more detail.

6 is a flowchart illustrating a process of converting a binding acknowledgment message into a registration response message in the router (BR) 430 according to an embodiment of the present invention in more detail.

7 shows a registration request message and a translated binding update message, corresponding to one embodiment of the invention.

8 illustrates a binding update message and a translated registration request message, corresponding to one embodiment of the present invention.

The present invention relates to network communication, and more particularly, to a communication method for providing updated binding information to a corresponding node of an IPv6 network in which a mobile node of a mobile IPv4 network communicates with the mobile node when the mobile node moves.

The number of users of the wireless Internet is increasing due to the performance improvement of mobile nodes such as portable computers and PDAs and the development of wireless communication technology. If the number of wireless Internet users is increasing as it is, the existing IPv4 addressing system alone cannot meet the increasing IP address requirements. Therefore, studies are being actively conducted to provide mobility of mobile nodes using IPv6, which is currently attracting attention as the next generation Internet protocol.

Mobile IPv6 provides mobility while retaining the features of IPv6, providing greater mobility and greater scalability than Mobile IPv4. Mobility support is inevitable as computers become smaller and Internet access is available through smaller terminals. As a result, efforts to support mobility in the Internet environment using the Internet Protocol (IP) are being made by the Internet Engineering Task Force's IP routing for Wireless / Mobile Hosts Charter, and standards for supporting mobility in IPv4 have been established. Since then, work has been done on supporting mobility of IPv6.

1 illustrates a system for describing a process of registering new binding information of a mobile node in a mobile IPv4 network. Referring to FIG. 1, when the mobile node MN 120 moves out of the home network to the external network, the external agent FA 110 of the external network transmits an advertisement message to the mobile node MN 120. The mobile node (MN) 120 receives a new care of address (CoA) through the transmitted advertisement message.
The mobile node (MN) 120 receiving the CoA transmits a registration request message including new binding information to the home agent (HA) 130 through the foreign agent 110 (FA). The home agent (HA) 130 transmits a registration response message to the mobile node (MN) 120 through the foreign agent (110, FA) in response to a registration request message.

2 illustrates a system for explaining a process of registering new binding information of a mobile node in a mobile IPv6 network. Referring to FIG. 2, when the mobile node MN 210 moves out of the home network to the external network, CoA is obtained from the external network 240, and the mobile node MN 210 binds and updates the obtained CoA. A binding update message is sent to the home agent HA 220.
In response to the binding update message, the home agent HA 220 binds the CoA with the home address of the mobile node MN 210 and transmits a binding acknowledgment message to the mobile node MN 210. After the new binding information is registered in the home agent HA, the mobile node 210 transmits a binding update message to the corresponding node CN 230 when the mobile node 210 receives a new packet from the home agent HA 220. The corresponding node (CN) 230 updates the new binding information and transmits a packet directly to the mobile node 210 using the updated binding information.

3 illustrates a communication path between a mobile node of a mobile IPv4 network and a corresponding node of an IPv6 network. When the mobile node MN 310 moves from the home network to the external network, the mobile node MN 310 transmits a registration request message to the corresponding node CN 360 in communication with the mobile node MN 310. However, there is no mechanism between the mobile IPv4 network 330 and the IPv6 network 350 to convert the mobile node's IPv4 type registration request message into an IPv6 type binding update message.
Accordingly, the registration request message of the mobile node cannot be directly transmitted to the corresponding node CN 360, and the registration request message is transmitted through the home agent HA 320 of the mobile node MN 310. A problem arises with triangular routing that must be

An object of the present invention is to provide a communication method for transmitting binding information of a mobile node to a corresponding node between a mobile node of a mobile IPv4 network and a corresponding node of an IPv6 network.

In order to achieve the above technical problem, in a communication network where a mobile node of a mobile IPv4 network and a corresponding node of an IPv6 network are connected through a router, the router
When a mobile node in a mobile IPv4 network moves to an external agent, it converts the mobile node's IPv4 format registration request message into an IPv6 format binding update message and responds to the binding update message to generate an IPv6 format binding acknowledgment message generated by the corresponding node of the IPv6 network. To a registration response message in IPv4 format,
Convert the IPv4 header and the mobile IPv4 header of the registration request message into the IPv6 header and the mobile IPv6 header of the binding update message, respectively, and convert the IPv6 header and the mobile IPv6 header of the binding acknowledge message into the IPv4 header and the mobile IPv4 header of the registration response message, respectively. .

delete

delete

Hereinafter, a communication method between a mobile node of a mobile IPv4 network and a corresponding node of an IPv6 network will be described in detail with reference to the accompanying drawings.

4 illustrates a system for explaining a process of transferring binding information of a mobile node between a mobile node of a mobile IPv4 network and a corresponding node of an IPv6 network according to an embodiment of the present invention. Mobile node (MN) 410 is present in mobile IPv4 network 430 and is in communication with corresponding node (CN) 460 of IPv6 network 450.

The mobile node (MN) 410 refers to a terminal capable of accessing a mobile IPv4 network as a node having mobility. The corresponding nodes CN and 460 are nodes communicating with the mobile nodes MN and 410, and the corresponding nodes CN and 460 are mobile terminals or fixed terminals.

When the mobile node 410 or MN moves out of the home network to an external network or when moving to another external network, the mobile node 410 or MN receives a CoA obtained from an external agent (not shown). A Registration Request message is sent to inform CN 460. Since the corresponding nodes CN 450 are connected to the IPv6 network 440, the corresponding nodes CN 450 cannot directly receive the registration request message transmitted by the mobile nodes 410 and MN of the mobile IPv4 network 430.
The routers BR and 440 existing at the boundary between the mobile node MN 410 and the corresponding node CN 460 convert the registration request message of the mobile IPv4 network into a binding update message of the IPv6 network. (CN, 460).

In response to the binding update message, the corresponding node CN 460 generates a binding acknowledgment message of the IPv6 network and transmits the binding acknowledgment message to the router BR 430. The router (BR) 440 converts the received binding acknowledgment message into a Registration Reply message of the mobile IPv4 network and transmits it to the mobile node (MN) 410.

5 is a flowchart illustrating a process of converting a registration request message into a binding update message in a router BR 440 in more detail.

Referring to FIG. 5, to transfer binding information of the mobile node to the corresponding node CN 460 connected to the IPv6 network, the mobile node MN 410 generates a registration request message (step 510). The generated registration request message is transmitted to the routers BR and 440 located at the boundary between the mobile node MN 410 and the corresponding node CN 460.
The routers BR and 440 convert the IPv4 header of the registration request message into the IPv6 header of the binding update message so that the corresponding node CN 460 connected to the IPv6 network can receive the registration request message (step 520). The IPv4 header of the registration request message may be converted to the IPv6 header of the binding update message using a stateless IP / ICMP translation (SIIT) algorithm. According to the field to which the present invention is applied, the IPv4 header of the registration request message may be converted to the IPv6 header of the binding update message using another algorithm, which is within the scope of the present invention.

Router 440 converts the mobile IPv4 header of the registration request message to the mobile IPv6 header of the binding update message (step 530).
In steps 510 to 530, the routers BR and 440 convert the registration request message of the mobile IPv4 network into the binding update message of the IPv6 network, and convert the converted binding update message to the corresponding node CN 460 of the IPv6 network. Send.

6 is a flowchart illustrating a process of converting a binding acknowledgment message into a registration response message by the router BR 440 in more detail.
Referring to FIG. 6, the corresponding node (CN) 460 of the IPv6 network generates a binding grant message in response to the received binding update message (step 610). The generated binding acknowledgment message is transmitted to the routers BR and 440 located at the boundary between the correspondent node CN 460 and the mobile node MN 410.
The routers BR and 440 convert the IPv6 header of the binding acknowledgment message into the IPv4 header of the registration response message so that the mobile node (MN) 410 of the mobile IPv4 network can receive the IPv6 type binding acknowledgment message (step 620). .

delete

Based on the conversion result of step 620, a first mapping table is generated for mapping the CoA in IPv6 format, the receiving address and the home address of the mobile node to addresses in the corresponding IPv4 format (step 630). CoA is an address allocated to and used by an external agent (not shown) by a mobile node (MN, 410), and a receiving address is an address of a corresponding node (CN, 460) receiving a predetermined packet from the mobile node (MN, 410). to be. The first mapping table generated in step 630 is generated in the routers BR and 440 and stored in a predetermined memory existing in or outside the routers BR and 440.

Based on the generated first mapping table, the router (BR) 440 converts the mobile IPv6 header of the binding grant message into the mobile IPv4 header of the registration response message (step 640). Through the steps 610 to 640, the binding acknowledgment message in the IPv6 format is converted into a registration response message in the IPv4 format at the routers BR and 440, and the converted registration response message is a mobile node (MN) connected to the IPv4 network. 410.

7 illustrates a registration request message and a translated binding update message according to an embodiment of the present invention.

In the routers BR and 440, the IPv4 header of the registration request message is converted into the IPv6 header of the binding update message through the SIIT algorithm, and a first mapping table is generated and stored in the routers BR and 440 based on the conversion result. . 7A, 7A, and 7C show an IPv4 header of a registration request message, an IPv6 header of a binding update message, and a first mapping table, respectively.

7 (b) and 7 (b ') show a mobile IPv4 header of a registration request message and a mobile IPv6 header of a binding update message, respectively. Movement of Registration Request Message The IPv4 header consists of an 8-bit type field, a 6-bit flag field, a 16-bit lifetime field, a 32-bit home address field, a home agent field, a CoA field, and a 64-bit identification field. . Meanwhile, the moving IPv6 header of the binding update message includes an 8-bit payload field, an 8-bit header len field, an 8-bit MH type field, a 16-bit checksum field, a 16-bit sequence number field, a 4-bit flag, and 16-bit. It consists of the lifetime field of. The movement IPv4 header of the registration request message and the movement IPv6 header of the binding update message have different fields, and the router IPv4 header of the registration request message is converted into the movement IPv6 header of the binding update message.

More specifically, 59 which means the mobile IPv6 header is inserted in the payload proto field, 16 which indicates the length of the mobile IPv6 header is inserted in the header len field, and 5 which indicates the binding update message is inserted in the MH type field. The checksum value calculated by the router (BR, 440) is inserted into the checksum field, the value allocated from the router (BR, 440) is inserted into the sequence number field, and a bit value requesting an acknowledgment is set in the AHLK field. The lifetime value of the mobile IPv4 header is inserted into the lifetime field.

8 illustrates a binding grant message and a converted registration response message according to an embodiment of the present invention.

(A), (a '), and (c) of FIG. 8 are generated in the process of converting the IPv6 header of the binding approval message, the IPv4 header of the registration response message, and the registration request message into the binding approval message, respectively. Each of the first mapping tables stored at 440 is illustrated.

8 (b) and 8 (b ') show a mobile IPv4 header of the registration response message converted based on the mobile IPv6 header of the binding grant message and the first mapping table, respectively. The moving IPv6 header of the binding acknowledgment message and the moving IPv4 header of the registration response message have different fields. In the router 440, the moving IPv6 header of the binding acknowledgment message is converted into a moving IPv4 header of the registration response message.

More specifically, 434 meaning a mobile IPv4 header is inserted in the UDP destination port field, 3 meaning a registration response message is inserted in the type field, 0 is inserted in the code field, and 0 is inserted in the code field. Field contains the lifetime value of the mobile IPv6 header, the home address field inserts the IPv4 address of the mobile node stored in the first mapping table, the home agent field inserts the IPv4 address of the router, and the Identification field responds upon registration. To prevent an attack, the value assigned from the router is inserted.

Meanwhile, the above-described embodiments of the present invention can be written as a program that can be executed in a computer, and can be implemented in a general-purpose digital computer that operates the program using a computer-readable recording medium.

The computer-readable recording medium may be a magnetic storage medium (for example, a ROM, a floppy disk, a hard disk, etc.), an optical reading medium (for example, a CD-ROM, DVD, etc.) and a carrier wave (for example, the Internet). Storage medium).

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

In the communication method between a mobile node of a mobile IPv4 network and a corresponding node of an IPv6 network, a router converts a header between the mobile IPv4 network and an IPv6 network, thereby directly binding binding information of the mobile node to a corresponding node of an IPv6 network. Can transmit Therefore, it is possible to solve the problem of triangular routing occurring between the mobile node of the mobile IPv4 network and the corresponding node of the IPv6 network.

Claims (8)

A communication method between a mobile node and a corresponding node in a communication network in which a mobile node of a mobile IPv4 network and a corresponding node of an IPv6 network are connected through a router, When the mobile node moves to an external agent, converting, from the router, a registration request message in IPv4 format to a binding update message in IPv6 format; And Converting, from the router, an IPv6 format binding acknowledgment message generated in the corresponding node in response to the binding update message to a registration response message in IPv4 format, In the router, the IPv4 header and the mobile IPv4 header of the registration request message are converted into the IPv6 header and the mobile IPv6 header of the binding update message, respectively. And at the router, an IPv6 header and a mobile IPv6 header of the binding grant message are converted into an IPv4 header and a mobile IPv4 header of a registration response message, respectively. delete delete The method of claim 1, wherein the IPv4 header of the registration request message and the IPv6 header of the binding grant message are respectively converted into an IPv6 header of a binding update message and an IPv4 header of a registration response message through a stateless IP / ICMP translation (SIIT) algorithm. Communication method. The method of claim 4, wherein When converting an IPv4 header of the registration request message into an IPv6 header of a binding update message, a first mapping table for mapping an IPv6 address and an IPV4 address is generated. And converting a moving IPv4 header of the registration request message and a moving IPv6 header of the binding approval message into a moving IPv6 header of a binding update message and a moving IPv4 header of a registration response message, respectively, based on the generated first mapping table. 6. The method of claim 5, wherein the mobile IPv6 header of the translated binding update message In the message field of the payload proto, a value is inserted that implies the move IPv6 header A value indicating the length of the moving IPv6 header is inserted into the message field of header len. In the message field of MH type, a value is inserted to mean the binding update message. The checksum value calculated by the router is inserted into the message field of checksum. The value allocated from the router is inserted into the message field of sequence number, A value is inserted into the message field of the AHLK to request an acknowledgment. Communication method in which lifetime value of mobile IPv4 is inserted into message field of lifetime. 6. The method of claim 5, wherein the mobile IPv4 header of the converted registration response message A value representing a mobile IPv4 header is inserted into a message field of a UDP destination port. In the message field of type, a value representing the registration response message is inserted. In the message field of code, a value is inserted to signify approval. The lifetime value of mobile IPv6 is inserted into the message field of lifetime. In the message field of home address, the IPv4 address of the mobile node stored in the router is inserted. The router's IPv4 address is inserted into the home agent's message field. The identification method assigned from the router is inserted into the message field of the identificationr. A computer-readable recording medium having recorded thereon a program for executing the method according to any one of claims 1 and 4 to 7.

Images