P2P之UDP穿透NAT的原理与实现附源代码,书我就没有传了，我想对想掌握P2P,NAT技术的朋友还是有一定的帮助吧！-P2P of UDP through NAT and implementation of the principles attached to the source code, the book I did not pass, I want to want to control P2P, NAT technology, the help of a friend or a cer