KR20040069502A - Method and apparatus for joining the function of protocol under IPv4-IPv6 - Google Patents

Abstract

PURPOSE: A method and an apparatus for joining the protocol function under IPv4-IPv6 coexistence environment are provided to save the cost of the network construction by improving the address conversion function. CONSTITUTION: A method for joining the protocol function under IPv4-IPv6 coexistence environment includes the steps of: (a) storing the change information between the IPv6 address and the IPv4 address after IPv6 address received from the IPv6 host(210) is converted into the IPv4 address through the NAT-PT; (b) storing the conversion information between the IPv4/IPv6 dual address and the IPv4 address after the IPv4/IPv6 dual address from the IPv4/IPv6 dual host(220) into the IPv4 address of the IPv4 host(240) through the DSTM; and (c) forming the unified mapping table adding the protocol identifying information for each protocol conversion information by connecting the conversion information at the processes (a) and (b) and inverse converting the IPv4 packet received from the IPv4 host(240) into the IPv6/IPv4 dual address and the IPv6 address with reference to the unified mapping table.

Description

IP4-4-IP6-sharing protocol function in coexistence environment and apparatus therefor {Method and apparatus for joining the function of protocol under IPv4-IPv6}

The present invention relates to an IPv4-IPv6 communication system, and more particularly, to a method and apparatus for sharing protocol functions between an IPv4 network and an IPv6 network.

Currently, a widely used network protocol based on the Internet is an Internet protocol called IP (Internet Protocol). The IP protocol plays a crucial role in connecting many networks and users in one short time to a large network called the Internet.

The IP protocol has evolved through several design changes, and the current version widely used over the Internet is IPv4. The major drawbacks of this relatively simple and flexible design are the lack of available IP addresses, the inefficiency of IP packet routing, and the complexity of the configuration process required for the IP node to work. To minimize these drawbacks, IPv6 was introduced as a new version.

In recent years, new IPv6-based networks have emerged, and although existing networks will be replaced by advanced IPv6, it is not possible to replace many IPv4-based hosts and routers with IPv6 for decades. And the idea that IPv6 will coexist together are dominant. Therefore, since all current Internet environments are configured based on IPv4 and IPv6 users must be connected to the IPv4 Internet, conversion between different protocols is required. Currently, many translation technologies are standardized in the Internet Engineering Task Force (IETF), and Network Address Translation-Protocol Translation (NAT-PT) and Dual Stack Transition Mechanism (DSTM) technologies are widely used.

1 is a conceptual diagram showing a communication processing system in the conventional IPv4 and IPv6.

Referring to FIG. 1, a dual stack transition mechanism (DSTM) system includes an address of an IPv4 / IPv6 subnet of an IPv6 network and an IPv4 network 110 in an environment having a dual stack of IPv4 / IPv6 subnets (142). Handles translation between IPv4 addresses.

It also handles translation between the IPv6 subnet 144 address of the IPv6 network and the IPv4 address of the IPv4 network 110.

As shown in FIG. 1, if there is an IPv4-IPv6 dual stack environment and an IPv6 stack environment, a protocol conversion system is inevitably required for each environment to be connected to the existing IPv4 Internet. This is different. In other words, the DSTM system is used in the IPv4-IPv6 dual stack environment, and the NAT-PT system is used in the IPv6 stack environment. Therefore, when the two environments are mixed, when the IPv4 / IPv6 subnet 142 and the IPv6 subnet 144 of the IPv6 network 142 are connected to the IPv4 network 110, the DSTM system 120 and the NAT-PT system 130 are respectively. There are problems that two separate conversion techniques must be applied through.

An object of the present invention is to provide a protocol function sharing method for improving address translation by integrating and sharing a mapping table for address translation that is common to two address translation technologies of DSTM system and NAT-PT system. have.

Another object of the present invention is to provide a protocol function sharing apparatus integrating and sharing a mapping table for address translation that can be commonly used in two address translation technologies of a DSTM system and a NAT-PT system.

In order to solve the above technical problem, in the protocol function sharing method of NAT-PT and DSTM in the IPv4-IPv6 coexistence environment of the present invention,

(a) receiving an IPv6 address from an IPv6 host, converting the IPv4 address to an IPv4 address of the IPv4 host through the NAT-PT, and storing the translation information between the IPv6 address and the IPv4 address;

(b) when receiving an IPv4 / IPv6 address from an IPv4 / IPv6 dual host, converting the IPv4 / IPv6 address to an IPv4 address of the IPv4 host through the DSTM, and storing the conversion information between the IPv4 / IPv6 address and the IPv4 address;

(c) integrating the conversion information stored in steps (a) and (b) to form a unified mapping table commonly used for IPv4 / IPv6 dual networks and IPv6 networks, and upon receiving an IPv4 packet from the IPv4 host, And inversely converting the IPv6 / IPv4 dual address and the IPv6 address with reference to an integrated mapping table.

In order to solve the above other technical problem, in the apparatus for sharing protocol functions of NAT-PT and DSTM in the IPv4-IPv6 coexistence environment of the present invention,

Receiving an IPv4 / IPv6 dual address and / or an IPv6 address from an IPv4 / IPv6 dual host and / or an IPv6 host converts the IPv4 host's IPv4 address via NAT-PT and / or DSTM, and then converts the IPv4 / IPv6 dual address and / or Or a protocol controller for storing translation information between the IPv6 address and the IPv4 address;

And a mapping table manager configured to form address translation information stored in the protocol controller into a mapping table, and to integrally manage address change between the IPv4 / IPv6 dual address and / or the IPv6 address and the IPv4 address.

1 is a conceptual diagram showing a communication processing system in the conventional IPv4 and IPv6.

2 is a block diagram showing a protocol function sharing apparatus in an IPv4-IPv6 coexistence environment according to the present invention.

FIG. 3 is a stack structure diagram of the protocol converter of FIG. 2.

4 is a flowchart illustrating a protocol function sharing method in an IPv4-IPv6 coexistence environment according to the present invention.

5 illustrates an embodiment of a unified mapping table.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

2 is a block diagram showing a protocol function sharing apparatus in an IPv4-IPv6 coexistence environment according to the present invention.

Referring to FIG. 2, the protocol conversion unit 230 shares NAT-PT and DSTM, and forms a mapping table by translating addresses using NAT-PT between IPv6 hosts 210 and IPv4 hosts 240. And, between the IPv4 / IPv6 dual host 220 and the IPv4 host 240 to convert the address using a DSTM to form a separate mapping table. This mapping table contains IPv4 address, IPv6 address for address translation, information necessary for table management, and function information indicating whether it is NAT-PT or DSTM, which are common to the two address translation technologies of DSTM and NAT-PT. have.

3 is a stack structure diagram of the protocol converter 230 of FIG. 2.

The protocol converter 230 of FIG. 3 includes a protocol controller 350, a mapping table manager 340, a TCP / UDP unit 330, an IPv6 stack unit 320, and an IPv4 stack unit 310. In addition, the protocol controller 350 includes a DNS unit, an FTP unit, a DSTM server unit, a DSTM interface unit 350, and an IPv4 address pool unit.

Referring to FIG. 3, the IPv6 stack unit 320 and the IPv4 stack unit 310 receive and transmit IPv6 packets and IPv4 packets to and from IPv6 / IPv4 dual, IPv6, and IPv4 networks, respectively.

The Transmission Control Protocol (TCP) / UDP (User Datagram Protocol) unit 330 identifies a transmission / reception destination of each packet transmitted and received from the IPv6 stack unit 320 and the IPv4 stack unit 310.

The mapping table manager 340 forms the address translation information generated through the NAT-PT and DSTM in the protocol controller 350 as an integrated mapping table, and operates and manages the integrated mapping table.

The protocol controller 350 includes a NAT-PT and a DSTM. When the protocol controller 350 receives an IPv4 / IPv6 dual address or an IPv6 address from an IPv4 / IPv6 dual host 220 or an IPv6 host 210, the protocol controller 350 uses NAT-PT or DSTM. After converting to an IPv4 address of an IPv4 host, the IPv4 / IPv6 dual address and the translation information between the IPv6 address and the IPv4 address are stored.

The protocol control unit 350 will be described in more detail. The DSTM server, DSTM interface, and IPv4 address pool are necessary modules for DSTM. That is, the DSTM server allocates IPv4 / IPv6 dual addresses by request of the DSTM host, the DSTM interface transmits IPv4 / IPv6 dual packets to the router, and the IPv4 address pool is an IPv4 address store.

On the other hand, Domain Name Server (DNS) and File Transfer Protocol (FTP) are necessary modules for NAT-PT. In other words, DNS provides an IPv4 address for the domain name of an IPv6 host, and FTP converts IPv4 and IPv6 addresses into addresses in the FTP information area.

4 is a flowchart illustrating a protocol function sharing method of the protocol conversion unit 230 in an IPv4-IPv6 coexistence environment according to the present invention.

First, upon receiving the IPv6 address for the call of the IPv4 host 240 in the IPv4 network from the IPv6 host 210 (step 410), the protocol conversion unit 230 converts the IPv6 address to the IPv4 address using NAT-PT. (420 courses). Subsequently, the protocol conversion unit 230 forms a mapping table between the IPv6 address and the IPv4 address in step 430. At this time, not only address information but also protocol management information and protocol conversion technology information (NAT-PT or DSTM) are added to the mapping table. Subsequently, the protocol converter 230 transmits a packet of an IPv4 address corresponding to the IPv6 address in step 440. Subsequently, upon receiving the IPv4 packet from the IPv4 host 240 (450), the protocol converter 230 transmits the IPv6 packet to the IPv6 host 210 with reference to the mapping table (step 460).

On the other hand, upon receiving the IPv4 / IPv6 address for the call of the IPv4 host 240 in the IPv4 network from the IPv4 / IPv6 dual host 220 (step 470), the protocol conversion unit 230 converts the IPv4 / IPv6 address to the IPv4 address using the DSTM. Convert to an address (step 4720). Subsequently, the protocol conversion unit 230 forms a separate mapping table between the IPv4 / IPv6 address and the IPv4 address (step 474). At this time, not only address information but also protocol management information and protocol conversion technology information (NAT-PT or DSTM) are added to the mapping table. Subsequently, the protocol converter 230 transmits a packet of an IPv4 address corresponding to the IPv4 / IPv6 address (step 476). Subsequently, upon receiving the IPv4 packet from the IPv4 host 240 (478), the protocol converter 230 transmits the IPv4 packet to the IPv4 / IPv6 dual host 220 with reference to the mapping table (step 482).

As a result, the protocol conversion unit 230 forms a unified mapping table in which the mapping table for DSTM is combined with the mapping tables for NAPT as shown in FIG. 5. Accordingly, the protocol conversion unit 230 converts the NAPT / DSTM protocol between the IPv6 host 210, the IPv4 / IPv6 dual host 220, and the IPv4 host 240 with reference to the unified mapping table to enable communication.

5 illustrates an embodiment of a unified mapping table.

Referring to FIG. 5, the unified mapping table includes mapped IPv6 addresses and IPv4 addresses, management information necessary for the table, and usage protocol information. The table management information includes, in one embodiment, priority for NAT-PT and DSTM and memory quota information for NAT-PT and DSTM. The usage protocol information includes an identifier indicating whether the mapped address translation techniques are NAT-PT and DSTM.

The present invention is not limited to the above-described embodiment, and of course, modifications may be made by those skilled in the art within the spirit of the present invention.

The invention can also be embodied as computer readable code on a computer readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, hard disk, floppy disk, flash memory, optical data storage device, and also carrier waves (for example, transmission over the Internet). Computer-readable recording media can also be distributed over network coupled computer systems so that the computer-readable code is stored and executed in a distributed fashion.

As described above, according to the present invention, by integrating and sharing a mapping table for address translation that is commonly used in two address translation technologies of a DSTM system and a NAT-PT system, the address translation function can be improved to reduce the cost of network configuration. Can be.

Claims (5)

In the protocol function sharing method of NAT-PT and DSTM in IPv4-IPv6 coexistence environment, (a) receiving an IPv6 address from an IPv6 host, converting the IPv4 address to an IPv4 address of the IPv4 host through the NAT-PT, and storing the translation information between the IPv6 address and the IPv4 address; (b) when receiving an IPv4 / IPv6 dual address from an IPv4 / IPv6 dual host, converting the IPv4 host to an IPv4 address of the IPv4 host through the DSTM, and storing the conversion information between the IPv4 / IPv6 dual address and the IPv4 address; (c) combining the conversion information stored in steps (a) and (b) to form a unified mapping table in which protocol identification information is added to each protocol conversion information, and receiving the IPv4 packet from the IPv4 host; And converting the IPv6 / IPv4 dual address and the IPv6 address into an IPv6 address by referring to a mapping table. The method of claim 1, wherein the mapping table includes mapped IPv6 address and IPv4 address information, table management information, and protocol information. 3. The method of claim 2, wherein the table management information includes priority for NAT-PT and DSTM and memory quota information for NAT-PT and DSTM. The method of claim 2, wherein the protocol information is an identifier indicating whether NAT-PT and DSTM are used. A device for sharing protocol functions of NAT-PT and DSTM in an IPv4-IPv6 coexistence environment, When an IPv4 / IPv6 dual address and an IPv6 address are received from an IPv4 / IPv6 dual host and an IPv6 host, the IPv4 / IPv6 dual address and the IPv6 address and the IPv4 address are converted to the IPv4 address of the IPv4 host for each via NAT-PT and DSTM. A protocol controller configured to generate mapping information with an address; And a mapping table manager configured to form mapping information generated by the protocol controller into a table and integrally manage the conversion between the IPv4 / IPv6 dual address and the IPv6 address and the IPv4 address.