RFC 8489

Session Traversal Utilities for NAT (STUN), February 2020

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RFC 5389
M. Petit-Huguenin
G. Salgueiro
J. Rosenberg
D. Wing
R. Mahy
P. Matthews
tram (tsv)

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DOI:  https://doi.org/10.17487/RFC8489

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Session Traversal Utilities for NAT (STUN) is a protocol that serves as a tool for other protocols in dealing with 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 document obsoletes RFC 5389.

For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 8729.

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