Interactive Connectivity Establishment (ICE): A Protocol for Network Address Translator (NAT) Traversal
RFC 8445
Document | Type |
RFC - Proposed Standard
(July 2018; No errata)
Updated by RFC 8863
Obsoletes RFC 5245
|
|
---|---|---|---|
Authors | Ari Keränen , Christer Holmberg , Jonathan Rosenberg | ||
Last updated | 2018-12-19 | ||
Replaces | draft-ietf-mmusic-rfc5245bis | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Reviews | |||
Stream | WG state | Submitted to IESG for Publication | |
Document shepherd | Peter Thatcher | ||
Shepherd write-up | Show (last changed 2018-01-12) | ||
IESG | IESG state | RFC 8445 (Proposed Standard) | |
Consensus Boilerplate | Yes | ||
Telechat date | |||
Responsible AD | Ben Campbell | ||
Send notices to | "Peter Thatcher" <pthatcher@google.com> | ||
IANA | IANA review state | Version Changed - Review Needed | |
IANA action state | RFC-Ed-Ack |
Internet Engineering Task Force (IETF) A. Keranen Request for Comments: 8445 C. Holmberg Obsoletes: 5245 Ericsson Category: Standards Track J. Rosenberg ISSN: 2070-1721 jdrosen.net July 2018 Interactive Connectivity Establishment (ICE): A Protocol for Network Address Translator (NAT) Traversal Abstract This document describes a protocol for Network Address Translator (NAT) traversal for UDP-based communication. This protocol is called Interactive Connectivity Establishment (ICE). ICE makes use of the Session Traversal Utilities for NAT (STUN) protocol and its extension, Traversal Using Relay NAT (TURN). This document obsoletes RFC 5245. 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/rfc8445. Keranen, et al. Standards Track [Page 1] RFC 8445 ICE July 2018 Copyright Notice Copyright (c) 2018 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 Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. This document may contain material from IETF Documents or IETF Contributions published or made publicly available before November 10, 2008. The person(s) controlling the copyright in some of this material may not have granted the IETF Trust the right to allow modifications of such material outside the IETF Standards Process. Without obtaining an adequate license from the person(s) controlling the copyright in such materials, this document may not be modified outside the IETF Standards Process, and derivative works of it may not be created outside the IETF Standards Process, except to format it for publication as an RFC or to translate it into languages other than English. Keranen, et al. Standards Track [Page 2] RFC 8445 ICE July 2018 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 5 2. Overview of ICE . . . . . . . . . . . . . . . . . . . . . . . 6 2.1. Gathering Candidates . . . . . . . . . . . . . . . . . . 8 2.2. Connectivity Checks . . . . . . . . . . . . . . . . . . . 10 2.3. Nominating Candidate Pairs and Concluding ICE . . . . . . 12 2.4. ICE Restart . . . . . . . . . . . . . . . . . . . . . . . 13 2.5. Lite Implementations . . . . . . . . . . . . . . . . . . 13 3. ICE Usage . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 13 5. ICE Candidate Gathering and Exchange . . . . . . . . . . . . 17 5.1. Full Implementation . . . . . . . . . . . . . . . . . . . 17 5.1.1. Gathering Candidates . . . . . . . . . . . . . . . . 18 5.1.1.1. Host Candidates . . . . . . . . . . . . . . . . . 18 5.1.1.2. Server-Reflexive and Relayed Candidates . . . . . 20 5.1.1.3. Computing Foundations . . . . . . . . . . . . . . 21 5.1.1.4. Keeping Candidates Alive . . . . . . . . . . . . 21 5.1.2. Prioritizing Candidates . . . . . . . . . . . . . . . 22 5.1.2.1. Recommended Formula . . . . . . . . . . . . . . . 22 5.1.2.2. Guidelines for Choosing Type and Local Preferences . . . . . . . . . . . . . . . . . . . 23 5.1.3. Eliminating Redundant Candidates . . . . . . . . . . 23 5.2. Lite Implementation Procedures . . . . . . . . . . . . . 23 5.3. Exchanging Candidate Information . . . . . . . . . . . . 24 5.4. ICE Mismatch . . . . . . . . . . . . . . . . . . . . . . 26Show full document text