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Method for realizing address translation application gateway by host mode

A technology of address conversion and host agent, which is applied in the direction of data exchange network, network connection, digital transmission system, etc., can solve the problems of non-disclosure of protocol content, difficult address conversion application gateway, etc., to achieve stable version, rich and perfect functions, Avoid the effects of frequent upgrades

Inactive Publication Date: 2005-03-09
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, for some private protocols that are sensitive to NAT, it is difficult to implement the address translation application gateway of this protocol on the router because the protocol content is not disclosed.
In addition, it is impossible to implement address translation application gateways on routers for every private protocol that is sensitive to NAT

Method used

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  • Method for realizing address translation application gateway by host mode
  • Method for realizing address translation application gateway by host mode
  • Method for realizing address translation application gateway by host mode

Examples

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Embodiment Construction

[0020] Combine below Figure 2-5 Preferred embodiments of the present invention are described.

[0021] like figure 2 As shown, the internal network (such as a local area network with an Ethernet structure) is connected to the external network (wide area network) through a network address translation router (hereinafter referred to as a NAT router). The solution of the present invention is to forward the application protocol message requiring special processing to the internal network host capable of processing the message for processing. The intranet host may be called an application gateway server (ALG Server). The normal communication between the address translation router and the application gateway server is realized through the communication protocol between the two parties. The router provides enough information for the application gateway server to ensure that it can correctly process the received special protocol message. At the same time, a programming interface...

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Abstract

This invention provides a method for realizing application gateway conversion to application protocol address with the host agent mode including the following steps: An internal net host capable of processing specific application protocol messages registers the application protocol to an address conversion router which forwards the effective load of the application protocol messages matched with registered protocol to the internal net host and converts its address according to the request of the internal net host which modifies the address in the effective load and sends it back to the address conversion router which regulates the message head of the effective load of the application protocol message fed back by the internal net host then to forward it.

Description

field of invention [0001] The invention relates to a network address translation (NAT) technology, in particular to a method for implementing an address translation application gateway in a host agent manner to perform network address translation. Background technique [0002] Network Address Translation (NAT) is an effective solution to the shortage of Internet (Internet) addresses. NAT processes information such as addresses and port numbers in packets, so that one IP address can be used by multiple users. While completing the transparent relay from the private network to the public network, NAT also has the functions of providing "privacy" protection for the internal network, providing certain services for the external network, and internal server load sharing. [0003] However, the use of the NAT function will cause many NAT-sensitive application protocols to fail to work properly. The so-called NAT-sensitive protocol refers to such a class of protocols. Some packets (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/24H04L12/66H04L29/06H04Q3/545
Inventor 赵朝阳
Owner HUAWEI TECH CO LTD
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