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STUN
(Simple Traversal of UDP (User Datagram Protocol) through NATs (Network Address Translators).
If we weren't still using IPv4... anyway.. a solution to a problem that should have never arisen. This is of relevance in all P2P operations of clients like typically file transfer and telephony.
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See Also
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Questions and Answers
<coyo> why not list STUNd as a dependancy of PSYC (or at least a recommendation) in the package manager?