Method and apparatus for implementing network communication through NAT

Abstract

The invention relates to a method for implementing network communication by penetrating NAT (network address transform), mainly comprising: when user terminal can not directly initiate communication with opposite user terminal in point-to- point communication mode because of needing to penetrate NAT entity, determining type information of the NAT entity; then, according to the determined type information of the NAT entity, adopting a preset point-to-point communication mode corresponding to the type information to establish communication connection with the opposite user terminal and carrying out communication between user terminals. And the invention adopts point-to-point communication mode as fully as possible in the course of communicating by penetrating NAT, thus reducing occupation of server resources and effectively saving network operating cost. And the invention tries to adopt corresponding retransmission mechanism in the course of point-to-point connection, to solve the connection establishing problem when various possible connection establishment influencing factors occur.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a method and device for realizing network communication through NAT. Background technique [0002] The P2P (point-to-point) communication technology of the current network does not need to directly realize point-to-point communication through a transit server. In the peer-to-peer communication process, the way of handling the connections of the clients in two different NATs (Network Address Translation) is more critical. Specifically, it is necessary to solve the traversal problem of NAT / FW (network address translation and firewall), especially Symmetric NAT (symmetric NAT), port hopping or strictly restricted NAT, and the traversal of dual intranet NAT application scenarios has become a problem. [0003] NAT is produced under the circumstance that internet IP addresses are increasingly scarce, and its main purpose is to enable address reuse. NAT is responsible f...

AI Technical Summary

Problems solved by technology

[0024] It can be seen that it is possible to use the above technology to traverse common Cone NAT, but this technology cannot traverse Symmetric (symmetric) NAT and NAT with strict port restrictions.

Therefore, UDP HOLE PUCHING is only a simple traversal of intranet NAT, which has great limitations. When dealing with port-restricted networks and symmetric NAT, it often needs to be implemented through a transit server instead of directly implementing point-to-point traversal.

This situation of occupying a large amount of transit server resources for transit communication services will inevitably increase the cost of network operation

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