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Method for mapping source port in address conversion table and network address conversion equipment

A network address translation and address translation table technology, applied in the field of communication, can solve the problems of increasing the number of conflicts in the complexity of mapping source ports, and achieve the effects of reducing the possibility of failing to establish a connection, reducing the number of searches, and improving efficiency.

Inactive Publication Date: 2009-04-29
BEIJING XINWANG RUIJIE NETWORK TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to propose a method for mapping source ports in an address translation table and a network address translation device to solve the problem that the complexity of mapping source ports increases with the number of conflicts in extreme cases

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  • Method for mapping source port in address conversion table and network address conversion equipment
  • Method for mapping source port in address conversion table and network address conversion equipment
  • Method for mapping source port in address conversion table and network address conversion equipment

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Embodiment Construction

[0028] image 3 It is a flowchart of a method embodiment of mapping a source port in an address translation table according to the present invention, including:

[0029] Step 31, the NAT device partitions the source port resource of the NAT device; specifically, it can be partitioned according to the port number size of the source port resource; it can also be partitioned according to the end of the port number, such as dividing ports whose port number ends with 1 into an interval.

[0030] Step 32, in the case that the port in the received IP message is already occupied, map the port in the IP message to a source port that differs from the port in the IP message by an integer number of intervals, the The range is obtained through resource partitioning. For example, the port in the IP message is mapped to the source port whose port number is H; wherein, H=h+m×l; h is the port number of the port in the IP message, and m can be recorded The number of intranet IP addresses can ...

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Abstract

The invention relates to a method for mapping source ports in an address translation table and a network address translation device. The method comprises the following steps: partitioning a source port resource of the network address translation device; and mapping a port of an IP message to the port differing from the port of the IP message by integral times of intervals which are obtained by resource partitioning in the case that the port of the received IP message is occupied. The network address translation device comprises a partitioning unit, a receiving unit and a mapping unit. By partitioning the source port resource, the NAT device solves a problem that the complexity of the mapping the source port increases with the increase of conflict times under extreme circumstances, which greatly reduces search times, improves the hit ratio of searching the effective source port, and the utilization rate of the source port of the NAT device is expanded to all ports from a fixed range.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a method for mapping a source port in an address translation table and a network address translation (Network Address Translation, NAT) device. Background technique [0002] With the continuous increase of Internet users, public Internet Protocol (Internet Protocol, IP) addresses are becoming increasingly scarce. For example, Asia, which accounts for 56% of the world's population, has only 9% of addresses, and China has only 0.06 IP addresses per capita. NAT technology is the most important technical means to solve the problem of IP address shortage. [0003] NAT technology converts multiple internal network IP addresses into one or several public network IP addresses, and manages a conversion relationship table that saves the address conversion correspondence in the NAT device for internal and external network communication, realizing private network access to the outside...

Claims

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Application Information

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IPC IPC(8): H04L29/12H04L29/06H04L12/56
Inventor 朱宁
Owner BEIJING XINWANG RUIJIE NETWORK TECH CO LTD
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