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Network address converting method for zoned message

A network address translation and message technology, which is applied in the field of data transmission, can solve the problems of NAT processing of fragmented messages, failure to realize the network address translation function of fragmented messages, loss of ordinary messages, etc.

Inactive Publication Date: 2005-02-23
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 3. It is enough to retransmit the loss of one ordinary message, and the retransmission of the entire message (multiple fragment messages) will be caused by the loss of one piece of fragmented message.
Fragments generally arrive consecutively, especially when the fragments are fragmented by network devices, the packets can basically be regarded as arriving at the same time. At this time, it is difficult to perform NAT processing on the fragmented packets
Existing network devices do not implement network address translation for fragmented packets

Method used

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  • Network address converting method for zoned message
  • Network address converting method for zoned message
  • Network address converting method for zoned message

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Embodiment Construction

[0026] Preferred embodiments of the present invention are illustrated below in conjunction with the accompanying drawings.

[0027] In order to be able to carry out NAT processing to fragmented messages, it is necessary to design for the characteristics that fragmented messages are different from ordinary messages. Specifically, the method of the present invention considers the following aspects:

[0028] 1. Try not to lose a fragment;

[0029] 2. Distinguish different fragmented packets according to IP address + IP identifier;

[0030] 3. After the arrival of the first fragment, the subsequent fragments will arrive soon. At this time, the NAT entry may not be created yet, and it is necessary to try to cache the incoming fragments;

[0031] 4. After all the fragments of the message are sent out, the NAT entry of the fragmented message is no longer useful, and the NAT entry needs to be deleted in time.

[0032] Based on the above considerations, the method for performing netw...

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Abstract

The method includes following method: when the fragment message arrives, NAT table item is established for first fragment message, NAT table look-up is made for next fragment; for the next fragment, if it is not succeeded in looking up table, then it is sent into buffer; the next fragment that is succeeded in looking up table is made NAT process.

Description

field of invention [0001] The invention relates to data transmission of IP (Internet Protocol) network, in particular to a method for performing network address translation on fragmented messages transmitted in the network. 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. [0003] The so-called fragmented message refers to the maximum length of each data frame that is passed through at the physical layer. When the IP (Internet Protocol) layer receives an IP message and needs to send it, it will query the value of the MTU (Maximum Transmission Unit) of the outgoing interface, and compare the MTU with the length of the data message. If the message length exceeds the MTU The IP packet needs to be fragmented. figure 1 An example of fragmenting a UDP (User Datagra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/24H04L29/06H04Q3/545
Inventor 宋端智业苏宁
Owner HUAWEI TECH CO LTD