Trusted UDP protocol, can control the rate can be achieved, but also realize through NAT. Was very good and valuable source code, I hope that everyone will read them.

Packet : 3970988natsocket.rar filelist
NatTraversal\NatSocket.cpp
NatTraversal\NatSocket.h
NatTraversal\NatThread.cpp
NatTraversal\NatThread.h
NatTraversal\SourceExchangeNAT.cpp
NatTraversal\SourceExchangeNAT.h
NatTraversal\TraverseByBuddy.cpp
NatTraversal\TraverseByBuddy.h
NatTraversal\TraverseBySourceExchange.cpp
NatTraversal\TraverseBySourceExchange.h
NatTraversal\TraverseBySvr.cpp
NatTraversal\TraverseBySvr.h
NatTraversal\TraverseStrategy.cpp
NatTraversal\TraverseStrategy.h
NatTraversal

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