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Method and apparatus for network address translation

A network address translation and IP address technology, applied in the field of network address translation methods and devices

Inactive Publication Date: 2011-11-02
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Port multiplexing converts "private IP address + port number" into "public network IP address + new port number". When converting the private IP address of the internal network to the public network IP address, multiple internal private The IP address is replaced with the same public IP address, but with a different port

Method used

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  • Method and apparatus for network address translation
  • Method and apparatus for network address translation

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Embodiment Construction

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in combination with the implementation manners and accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0024] figure 1 is a schematic diagram of an application scenario of an embodiment of the present invention, such as figure 1 As shown, in the prior art, the internal network hosts 101 and 102 access the public network server 104 through the NAT device 103, wherein the address of the internal network host 101 is 10.1.1.100, the address of the internal network host 102 is 10.1.1.200, and the public network server The public network address of 104 is 211.100.7.34. NAT device 103 assigns the same public IP address 162.105.178.65 to intranet h...

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PUM

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Abstract

The invention relates to a method and an apparatus for Network Address Translation (NAT). The method includes that: a NAT device receives a data package transmitted from an intranet host, parses the data package, obtains a first source Internet Protocol (IP) address, a first source port, a first destination IP address and a first IP data package Identifier (IPID) contained in the data package, performs processing, which includes the steps of translating the first source IP address into a second source IP address and translating the first source port into a second source port, for the first source IP address and the first source port in the data package, performs processing for the first IPID in the data package, and transmits the processed data package according to the first destination IP address. The method and apparatus for network address translation proposed in the invention can modify the IPIDs of messages at the same time when the address translation is performed at the NAT device, and thus ensure that no mistake will occur when a destination device performs message recombination.

Description

technical field [0001] The present invention relates to the field of network technology, in particular to a network address translation method and device. Background technique [0002] In the prior art, due to address planning and other reasons, IPv4 (Internet Protocol version 4, Internet Protocol version 4) addresses are facing a situation of rapid depletion, so IETF (Internet Engineering Task Force, Internet Engineering Task Force) in IPv4 Private IP address segments are defined in , including: 10.x.x.x, 172.16.x.x-172.31.x.x, 192.168.x.x. These private IP addresses can be used to build private networks (internal networks), such as internal networks of companies and enterprises, which greatly reduces the demand for public network addresses and solves the problem of exhaustion of public network IP addresses to a certain extent. However, these private IP addresses are not routable on the public network (Internet). In order to allow hosts on the private network to access ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/12
CPCH04L29/12339H04L61/2503
Inventor 徐靖
Owner HUAWEI TECH CO LTD
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