Network Address Translators

http://zh.wikipedia.org/wiki/%E7%BD%91%E7%BB%9C%E5%9C%B0%E5%9D%80%E8%BD%AC%E6%8D%A2

http://blog.csdn.net/colinchan/article/details/712773

 

 

Peer-to-Peer (P2P) communication across middleboxes（翻译2）

http://blog.csdn.net/hxhbluestar/article/details/102387

 

P2P之UDP穿透NAT的原理与实现

 

http://midcom-p2p.sourceforge.net/draft-ford-midcom-p2p-01.txt