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  STUN -- TCP Activity (Magic Cookie 0x72C64BC6)

Category: PROTOCOLS      

Application: STUN      

Session Traversal Utilities for NAT (STUN) is a protocol that serves as a tool for other protocols in dealing with Network Address Translator (NAT) traversal. It can be used by an endpoint to determine the IP address and port allocated to it by a NAT. It can also be used to check connectivity between two endpoints, and as a keep-alive protocol to maintain NAT bindings. STUN works with many existing NATs, and does not require any special behavior from them.

STUN is not a NAT traversal solution by itself. Rather, it is a tool to be used in the context of a NAT traversal solution. This is an important change from the previous version of this specification (RFC 3489), which presented STUN as a complete solution.

This SonicWALL signature identifies legitimate TURN protocol.

Warning: enabling this signature may disable or limit a broad range of peer-to-peer client applications like Skype (VoIP), QQMusic (MULTIMEDIA), and others. Use with caution.

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