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Method for applying layer gateway used for network address conversion and in protocol translation

A technology of network address translation and application layer gateway, which is applied in the direction of network connection, data exchange network, digital transmission system, etc. It can solve the problems of not explaining the implementation mechanism of SIPALG, not realizing the SIPALG mechanism and standards that can be followed

Inactive Publication Date: 2009-05-27
INST OF COMPUTING TECH CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The mechanism of NAT-PT is described in RFC2766, but there is no description of the implementation mechanism of SIP ALG, and so far there is no mechanism and standards for implementing SIP ALG in NAT-PT

Method used

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  • Method for applying layer gateway used for network address conversion and in protocol translation
  • Method for applying layer gateway used for network address conversion and in protocol translation
  • Method for applying layer gateway used for network address conversion and in protocol translation

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Embodiment Construction

[0050] The invention is applicable to various network topology environments.

[0051] A network topology environment is shown in Figure 1. An IPv6 network domain A includes a boundary IPv6 SIP Proxy server X and an IPv6 DNS server DNS_A, and an IPv6 SIP user terminal X' is registered on the IPv6 SIP Proxy server X in this domain. The IPv4 network domain B contains a boundary SIP Proxy server Y and IPv4 DNS server DNS_B, and the IPv4 SIP user terminal Y' is registered to the IPv4 SIP Proxy server Y in this domain. The NAT-PT system is located between IPv6 network domain A and IPv4 network domain B.

[0052] Combining with the network topology environment in Figure 1, the domain name resolution between IPv6 SIP Proxy server X in IPv6 network domain A and IPv4 SIP Proxy server Y in IPv4 network domain B is realized with the assistance of DNSALG and NAT-PT systems. In addition, in order to support IPv4 SIP user terminal Y' in IPv4 network domain B to initiate a call request to IP...

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Abstract

The present invention alates to an implementation method of SIP application layer gateway for IPv4 / IPv6 network address conversion and protocol translation. Said method includes the following steps: firstly, creating a static mapping entry for boundary SIP proxy server of IPv6 domain in address mapping table of NAT-PT system; NAT-PT system can be used for identifying data packet of SIP protocol, and transferring the data packet onto application layer gateway to make processing; said processing includes two portions; first, translation processing of SIP message head field; and second, translation processing of SDP message body contents; finally, the SIP application layer gateway can transmit out the translation-processed SIP data packet.

Description

technical field [0001] The invention relates to the technical field of application layer gateways for computer network communication, in particular to a method for realizing SIP application layer gateways used in IPv4 and IPv6 network address translation and protocol translation. Background technique [0002] IPv6 (Internet Protocol Version 6) protocol is a next-generation Internet protocol that replaces IPv4 (Internet Protocol Version 4) protocol, and it has many new features and functions. During the network transition period, IPv4 and IPv6 technologies will coexist for a long time, and eventually transition to IPv6. At present, how to realize the smooth transition from IPv4 protocol to IPv6 protocol is a problem that people face. The IETF working group proposed several mechanisms to realize IPv4 and IPv6 intercommunication: dual protocol stack (described in RFC2893), tunnel technology (described in RFC2893), NAT-PT (Network Address Transition Protocol, network address tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/66H04L12/56H04L29/06H04L29/12
Inventor 李丹王春峰李忠诚
Owner INST OF COMPUTING TECH CHINESE ACAD OF SCI
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