Method and system for regulating NAT (Network Address Translation) equipment self-adapting to multilayer NAT environment

Abstract

The present invention proposes a NAT device adjustment method and system for an adaptive multi-layer network address translation (NAT) environment, wherein the method includes: the local NAT device obtains an IP address from a WAN interface, and judges whether the IP address is a private network IP address , if yes, then judge whether the upper-level NAT device sends the NAT seed (Seed) carrying the NAT parameters of the upper-level NAT device, if yes, then obtain the NAT parameters of the upper-level NAT device from the NAT Seed, if not, the local NAT The device performs a NAT parameter test with the neighbor NAT device to obtain the NAT parameters of the upper-layer NAT device; after that, the local NAT device adjusts its own NAT parameters according to the NAT parameters of the upper-layer NAT device. The invention can solve the problem of selection and configuration of NAT parameters by the NAT equipment of the whole network, and ensures the normal progress of NAT traversal in the multi-layer NAT environment.

Description

technical field [0001] The present invention relates to the technical field of Network Address Translation (NAT, Network Address Translation), in particular to a NAT device adjustment method and system for an adaptive multi-layer NAT environment. Background technique [0002] NAT technology is a technology to solve the shortage of IP addresses in the Internet. Its solution is: the device uses a private network IP address in the internal network, and translates the private network IP address into a legal public network IP address through NAT, and uses it on the Internet. [0003] According to the definition of RFC 1631, NAT can be divided into the following four different types: [0004] Full Cone (Full Cone), Figure 1A It is a schematic diagram of Full Cone NAT in the prior art. The internal network host uses the internal network IP X and port y to establish a socket (Socket). When using this Socket to send data to the external host for the first time, NAT will assign a pu...

AI Technical Summary

Problems solved by technology

At present, the automatic adjustment and adaptation technology in the multi-layer NAT environment is mainly configured by each NAT device by searching its own NAT session table to configure its own NAT conversion mode; it can be seen that the prior art only solves the problem of a single NAT device selecting NAT conversion However, it is impossible to solve the problem of selection and configuration of NAT parameters (including NAT conversion mode) by NAT devices in the entire network, and it is impossible to guarantee the normal operation of NAT traversal in a multi-layer NAT environment.

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