Stun

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STUN is the Simple Traversal of UDP Through NAT. It is defined in RFC 3489.

Identification

Ports

Wikipedia says: "The STUN server is contacted on UDP port 3478, however the server will hint clients to perform tests on alternate IP and port number too (STUN servers have two IP addresses). The RFC states that this port and IP are arbitrary."

l7-filter

l7-filter uses the stun pattern. It is untested.

See also