RFC 5389

Session Traversal Utilities for NAT (STUN), October 2008

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RFC 3489
Obsoleted by:
RFC 8489
Updated by:
RFC 7350, RFC 8553
J. Rosenberg
R. Mahy
P. Matthews
D. Wing
behave (tsv)

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DOI:  https://doi.org/10.17487/RFC5389

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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 document obsoletes RFC 3489. [STANDARDS-TRACK]

For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 8729.

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