A method for system terminal to establish NAT channel penetration

A system terminal and equipment technology, applied in transmission systems, digital transmission systems, error prevention/detection using return channels, etc., can solve the problems of low efficiency and poor versatility of forwarding traversal

Inactive Publication Date: 2008-09-10
INST OF COMPUTING TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the defects of inefficient forwarding traversal and poor versatility in the existing NAT network environment, the present invention proposes a method for system terminal equipment to establish a NAT traversal channel

Method used

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  • A method for system terminal to establish NAT channel penetration
  • A method for system terminal to establish NAT channel penetration
  • A method for system terminal to establish NAT channel penetration

Examples

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Embodiment Construction

[0107] The method for establishing a progressive end-to-end NAT traversal channel initiated by the data sending port provided by the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0108] figure 1 Shown is a schematic diagram of the same-root multi-layer NAT network structure, a private network 4-1 accesses the public network 3 through a NAT device 1001, and a private network 4-2 accesses the private network 4-1 through another NAT device 1002. The private network connected to the public network 3 through the NAT device 1001 is a network controlled by the NAT device, and the private network 4-2 connected to the private network 4-1 through the NAT device 1002 is a network controlled by the NAT device. The NAT device directly connected to the public network 3 is the root NAT device. The minimum number of NAT devices that each private network passes through to the public network 3 is the number of layers...

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Abstract

The invention discloses a method for building an NAT crossing channel by a system terminal unit, which comprises the following steps: the terminal unit of a calling party system respectively obtains a data receiving port and an network address on forwarding service nodes, the data receiving port and the network address on an NAT unit, and the data receiving port and the network address on the system terminal unit by the forwarding service nodes and sends the data receiving ports and the network addresses to the terminal unit of a called party system; a data sending port of the terminal unit of the called party system respectively carries out a through testing, a forwarding testing and a crossing testing in sequence towards the terminal unit of the calling party system and obtains the network address and the port of the data receiving port of the terminal unit of the calling party system; the network address and the port received by the data receiving port of the terminal unit of the called party system are sent to the terminal unit of the calling party system. The method for building the NAT crossing channel by the system terminal unit of the invention takes the communication diversity of multilevel NAT from terminal to terminal into consideration, makes the most of network resources in a private network formed by multilevel NAT and can realize the crossing of NAT under a plurality of occasions.

Description

technical field [0001] The present invention relates to the technical field of computer network communication, and more specifically, the present invention relates to a method for establishing a NAT traversal channel for a system terminal device. Background technique [0002] As we all know, due to limited IP addresses and uneven distribution, there is a serious shortage of network addresses. From the perspective of practical application and deployment, Network Address Translator (NAT) technology is an important method to solve the problem of insufficient IP addresses to access the Internet. With the increase of personal information devices, the popularization of network access devices and the development of network technology, more and more companies, groups and families hope to organize these devices together in a network and connect to the Internet. Considering security, how to hide high-security nodes on the network is a problem faced by many companies. In the case of a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L29/06H04L29/12H04L1/16
CPCH04L61/256
Inventor 傅川王迪张国清杨清峰秦卓琼
Owner INST OF COMPUTING TECH CHINESE ACAD OF SCI
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