本文介绍了四种不同的NAT类型：Full cone, Address restrict, Port restrict和Symmetric NAT，并详细阐述了如何使用STUN Server判断NAT类型。同时，文章提供了UDP-P2P打洞穿网的步骤及适用场景，分析了哪些NAT组合可以成功建立P2P连接，哪些则不能。"
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有4种NAT类型：
- Full cone NAT
- (Address) restrict cone NAT
- Port restrict cone NAT
- Symmetric NAT
打洞穿网需要两台Server：
- 信令Server，帮助客户机沟通IP：Port
- STUN Server，客户机判断自己所在NAT类型
STUN Server判断NAT类型步骤，参考下面链接：
UDP-P2P打洞穿网步骤，参考下面链接：
http://www.blogjava.net/linli/archive/2014/10/23/418968.html
下面这些情况下可以UDP-P2P打洞穿网：
- Full cone NAT -> Full cone NAT
- Full cone NAT -> (Address) restrict cone NAT
- Full cone NAT -> Port restrict cone NAT
- Full cone NAT -> Symmetric NAT
- (Address) restrict cone NAT -> Full cone NAT
- (Address) restrict cone NAT -> (Address) restrict cone NAT
- (Address) restrict cone NAT -> Port restrict cone NAT
- (Address) restrict cone NAT -> Symmetric NAT
- Port restrict cone NAT -> Full cone NAT
- Port restrict cone NAT -> (Address) restrict cone NAT
- Port restrict cone NAT -> Port restrict cone NAT
- Symmetric NAT -> Full cone NAT
- Symmetric NAT -> (Address) restrict cone NAT
下面这几种情况不可以UDP-P2P打洞穿网：
- Port restrict cone NAT -> Symmetric NAT
- Symmetric NAT -> Port restrict cone NAT
- Symmetric NAT -> Symmetric NAT
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