P2P穿透NAT原理浅析

Analysis of P2P Across NAT

随着基于Internert的P2P网络技术的广泛应用,更多的内网主机需要参与到P2P中来.在NAT之后的主机IP地址在Internet上是不可见的,Internet上的主机不能主动访问这些位于NAT后的主机,但P2P网络要求任何主机之间都能直接对等交换信息,这就使得P2P网络应用必须解决穿透NAT实现双向对等通讯问题.本文对P2P应用软件穿透NAT的几种方法做了详细的介绍,对实际应用程序的开发具有指导作用.

With the wide application of P2P （Peer-to-Peer） network technology based on Internet, more internal hosts need joining P2P. IP addresses of hosts behind NAT are unseen from Internet, and hosts in internet can＇t access hosts behind NAT actively. But the P2P network requires that any computer can exchange information directly, thus P2P applications must solve the problems of bidirectional communication across NAT. This paper introduces several methods of P2P across NAT, and these methods can guide development of practical application programs.