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NAT (network address translation) traversal method, system and relay server by relay mode

A server, service address technology, applied in the field of computer networks, can solve problems such as scalability issues

Inactive Publication Date: 2011-04-27
NEC (CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, it is hoped to provide a method, system and corresponding relay server for traversing NAT by means of relay, which can solve the scalability problem faced by the TURN scheme in the prior art

Method used

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  • NAT (network address translation) traversal method, system and relay server by relay mode
  • NAT (network address translation) traversal method, system and relay server by relay mode
  • NAT (network address translation) traversal method, system and relay server by relay mode

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Embodiment Construction

[0046] The present invention utilizes the principle of source routing technology widely used in overlay network and ad-hoc network to solve the NAT problem, especially the symmetric NAT problem.

[0047] Source routing technology enables the sender of a packet to partially or fully specify the route that the packet takes in the network. In contrast, in non-source routing protocols, routers in the network determine the path based on the packet's destination.

[0048] In a typical source routing mechanism, the sender / source wraps routing information into packets. Routing information contains necessary path information from a source address to a destination address. Each node on the path that receives the packet extracts the next-hop address from the packet and forwards it to the next hop. Each node on the path repeats the process until the packet reaches its destination.

[0049] For example, suppose host A wants to send data to host B, and host A knows in advance that it can...

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Abstract

The invention provides an NAT (network address translation) traversal method, system and relay server by a relay mode. The NAT traversal method by a relay mode comprises the following steps: a first host transmits a relay request message to service address of the relay server by utilizing an NAT address through NAT equipment; and the relay server returns a relay response message to the first host, wherein the relay response message comprises an address list, and the address list comprises a relay address and the NAT address.

Description

technical field [0001] The present invention relates to a computer network, and more specifically to a method, a system and a relay server (relay server) for performing network address translation (network address translation, NAT) traversal in a relay manner. Background technique [0002] In computer networking, Network Address Translation (NAT) is the process of modifying the network address information in the header of a datagram packet when passing traffic through a traffic-routing device so that a given address space Remap to another address space. NAT was designed to alleviate the problem of IPv4 address exhaustion. NAT has become a standard, integral feature in routers for home and small business Internet connections. [0003] Most systems that use NAT perform NAT to enable multiple hosts on a private network to use a common Internet Protocol (IP) address to access the Internet. Hosts on the private network cannot directly use their local addresses in the internal ...

Claims

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Application Information

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IPC IPC(8): H04L29/12
CPCH04L61/2589H04L29/12566
Inventor 黄权胡艳夏勇
Owner NEC (CHINA) CO LTD
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