Does STUN only work for UDP? Follow-up to how NAT Traversal and STUN work.

Why does STUN only work for UDP? Can TCP be supported?

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Because STUN is an IP protocol, it will only support UDP. As for Transmission Control Protocol (TCP), it is connection oriented and operates at a higher layer than IP communications. These protocols have entirely different capabilities. TCP conversations establish sessions. UDP, STUN and IP will not guarantee a connection, but they will find and operate over the best path.

This was first published in October 2006

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