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Network address and protocol translating equipment and application layer gateway equipment

A protocol translation, network address technology, applied in the communication between network address and protocol translation and application layer gateway equipment, NAP protocol field, can solve the problem of NAT-PT deployment inconvenience

Active Publication Date: 2008-03-05
CHINA TELECOM CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the current NAT-PT device only supports DNS ALG, and if it wants to support FTP ALG and SIP ALG, it needs to update the NAT-PT software version, which brings great inconvenience to the deployment of NAT-PT on the operating network

Method used

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  • Network address and protocol translating equipment and application layer gateway equipment
  • Network address and protocol translating equipment and application layer gateway equipment
  • Network address and protocol translating equipment and application layer gateway equipment

Examples

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Embodiment Construction

[0020] The specific embodiments of the present invention will be described below in conjunction with the drawings.

[0021] In the following description, certain specific details are given in order to provide a sufficient understanding of the embodiments of the present invention. However, those skilled in the art know that the present invention can be implemented without these details. In other cases, well-known structures related to networks, servers, protocols, etc. are not shown or described in detail to avoid unnecessary interference with the description of the embodiments of the present invention.

[0022] Referring to FIG. 2, the ALG function is separated from the NAT-PT device 20 through the NAP protocol to form a separate ALG device 40. This ALG device 40 may be specifically for a certain business, or a combination of multiple businesses. The ALG device 40 and the NAT-PT device 20 are interconnected through a standard IP protocol, and need to support both IPv4 and IPv6 pro...

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Abstract

Being able to communicate with one or more application layer gateway (ALG), the network address (Add) and protocol translation (NAT-PT) equipment includes devices: aiming at each dialog process, mapping maintenance device (MMD) is in use for buffering IPv4 Add and port numbers of source and destination (APNSD) associated to dialog ID as well as corresponding (Corr) IPv6 APNSD; based on IPv4 / IPv6 Add mapping info of dialog ID of the dialog belonging to Corr input data packet (DP) buffered by MMD, the IP translation device is in use for translating IP head of input DP; NAP protocol device (NAPD) is in use for communicating with ALG device; flow feature recognition device is in use for checking whether the translated DP is matched to flow feature related to one of ALG devices; if not, sending the DP normally; if yes, then NAPD forwards the DP to the matched ALG device. Responding to request of ALG device, NAPD can provide mapping info of IPv4 / IPv6 Add Corr to dialog ID.

Description

Technical field [0001] The present invention generally relates to the field of network intercommunication and service intercommunication between IPv4 and IPv6, and particularly relates to a communication method between network address and protocol translation (NAT-PT) and application layer gateway (ALG) equipment, and NAP (NAT-PT and ALG Protocol: NAT) -PT and ALG agreement) agreement. Background technique [0002] The NAT-PT technology is defined in RFC2766 and is applied to the communication between a pure IPv4 network and a pure IPv6 network. The NAT-PT device reserves an IPv4 address pool and an IPv6 address pool, which are used to identify IPv6 nodes in an IPv4 network and IPv4 nodes in an IPv6 network, respectively. At the same time, for each session, the NAT-PT device caches the source and destination IPv4 address and port number, and the 8-tuple mapping information of the source and destination IPv6 address and port number to ensure the consistency of each IPv4 / IPv6 proto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/06H04L12/56H04L12/66H04L12/46H04L29/12H04L45/52
Inventor 张浩锋解冲锋谭国权王和宇广小明王玮李振雨
Owner CHINA TELECOM CORP LTD
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