1. Relaying
靠server转发
2. Connection Reversal
有一台client位于公网
3. UDP Hole Punching
Must be EIM-NAT
rfc5128 State of Peer-to-Peer (P2P) Communication across Network Address Translators (NATs)
Simultaneous TCP open 同時開放TCP連接:
http://show20s.blog.hexun.com.tw/32352962_d.html
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