The P2P network technology and the principle of NAT and the impact of NAT on P2P are discussed. A method of using UDP(User Datagram Protocol) to traverse NAT under P2P framework are analyzed, coupled with an extra Registration Server.

• 在介绍了基于Internet的P2P网络技术和NAT基本原理的基础上,分析了NAT对P2P的影响,提出了通过一台Internet上的注册服务器,利用UDP(UserDatagramProtocol,用户数据报协议)实现P2P网络穿越NAT的方法;