P2P communication and file transfer method facing wide area network

Abstract

A peer-to-peer communication and file transfer method oriented to wide area networks comprises the following steps that: (1) the network position of a user is judged, and the communication mode is judged according to the network positions of an initiating side and a receiving side carrying out network communication; possible situations are as follows: communication among users in the same internal network, communication among users in public network, communication initiated by internal network users to public network users, communication initiated by public network users to internal network users, communication among users in different internal networks; (2) if the communication mode belongs to the communication among users in the same internal network, the communication among users in public network or the communication initiated by internal network users to public network users, the TCP protocol 'three-way handshake' mechanism is adopted to establish connection; if the communication mode belongs to the communication initiated by public network users to internal network users or the communication among users in different internal networks, the NAT / NAPT penetration method based on UDP protocol is adopted to establish connection; (3) communication or file transfer is carried out after successful connection. The present invention realizes the peer-to-peer communication and the file transfer for wide area network users, and has good self adaptability and transfer reliability.

Description

technical field [0001] The invention relates to a network communication and file transmission method, in particular to a peer-to-peer communication and file transmission method oriented to a wide area network. Background technique [0002] At present, P2P (Peer-to-Peer, peer-to-peer network) technology has achieved "decentralization" and has the advantages of improving the network utilization rate of network users, making the development of instant messaging software based on this technology Ascendant. However, due to the complex topology of the wide area network, the application of peer-to-peer communication will be restricted. Especially due to the lack of IP addresses or due to the user's own application needs, there have been NAT / NAPT (Network Address Translation / Network Address Port Translation) protocols that use gateways to build private local area networks, and connect the private local area network to the wide area network as a whole, so that Each user in the LAN ...

AI Technical Summary

Problems solved by technology

And this moment, public network user initiates communication to private intranet user or can not initiate communication two modes between private intranet user and can not complete peer-to-peer communication and file transmission because of being unable to establish connection by TCP (Transmission Control Protocol) agreement, the present invention It was proposed to solve this problem

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