Session Traversal Utilities for NAT (STUN)
RFC 8489
| Document | Type |
RFC - Proposed Standard
(February 2020; No errata)
Obsoletes RFC 5389
|
|
|---|---|---|---|
| Last updated | 2020-02-21 | ||
| Stream | IETF | ||
| Formats | plain text html pdf htmlized bibtex | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Tolga Asveren | ||
| Shepherd write-up | Show (last changed 2018-02-02) | ||
| IESG | IESG state | RFC 8489 (Proposed Standard) | |
| Consensus Boilerplate | Yes | ||
| Telechat date | |||
| Responsible AD | Magnus Westerlund | ||
| Send notices to | Tolga Asveren <tasveren@rbbn.com>, Gonzalo.Camarillo@ericsson.com | ||
| IANA | IANA review state | Version Changed - Review Needed | |
| IANA action state | RFC-Ed-Ack | ||
Internet Engineering Task Force (IETF) M. Petit-Huguenin
Request for Comments: 8489 Impedance Mismatch
Obsoletes: 5389 G. Salgueiro
Category: Standards Track Cisco
ISSN: 2070-1721 J. Rosenberg
Five9
D. Wing
Citrix
R. Mahy
Unaffiliated
P. Matthews
Nokia
February 2020
Session Traversal Utilities for NAT (STUN)
Abstract
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.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
https://www.rfc-editor.org/info/rfc8489.
Petit-Huguenin, et al. Standards Track [Page 1]
RFC 8489 STUN February 2020
Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents
1. Introduction ....................................................4
2. Overview of Operation ...........................................5
3. Terminology .....................................................7
4. Definitions .....................................................7
5. STUN Message Structure ..........................................9
6. Base Protocol Procedures .......................................11
6.1. Forming a Request or an Indication ........................11
6.2. Sending the Request or Indication .........................12
6.2.1. Sending over UDP or DTLS-over-UDP ..................13
6.2.2. Sending over TCP or TLS-over-TCP ...................14
6.2.3. Sending over TLS-over-TCP or DTLS-over-UDP .........15
6.3. Receiving a STUN Message ..................................16
6.3.1. Processing a Request ...............................17
6.3.1.1. Forming a Success or Error Response .......17
6.3.1.2. Sending the Success or Error Response .....18
6.3.2. Processing an Indication ...........................18
6.3.3. Processing a Success Response ......................19
6.3.4. Processing an Error Response .......................19
7. FINGERPRINT Mechanism ..........................................20
8. DNS Discovery of a Server ......................................20
8.1. STUN URI Scheme Semantics .................................21
9. Authentication and Message-Integrity Mechanisms ................22
9.1. Short-Term Credential Mechanism ...........................23
9.1.1. HMAC Key ...........................................23
9.1.2. Forming a Request or Indication ....................23
9.1.3. Receiving a Request or Indication ..................23
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