Interactive Connectivity Establishment (ICE): A Protocol for Network Address Translator (NAT) Traversal
draft-ietf-ice-rfc5245bis-14
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2017-10-30
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draft-ietf-mmusic-rfc5245bis
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IETF
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Proposed Standard
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Peter Thatcher
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ICE A. Keranen
Internet-Draft C. Holmberg
Obsoletes: 5245 (if approved) Ericsson
Intended status: Standards Track J. Rosenberg
Expires: May 3, 2018 jdrosen.net
October 30, 2017
Interactive Connectivity Establishment (ICE): A Protocol for Network
Address Translator (NAT) Traversal
draft-ietf-ice-rfc5245bis-14
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 Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on May 3, 2018.
Copyright Notice
Copyright (c) 2017 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
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
Keranen, et al. Expires May 3, 2018 [Page 1]
Internet-Draft ICE October 2017
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than English.
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 . . . . . . . . . . . . . . . . . . . . . . . 12
2.5. Lite Implementations . . . . . . . . . . . . . . . . . . 13
3. ICE Usage . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 13
5. ICE Candidate Gathering and Exchange . . . . . . . . . . . . 17
5.1. Full Implementation . . . . . . . . . . . . . . . . . . . 18
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 . . . . . . . . . . . . 25
5.4. ICE Mismatch . . . . . . . . . . . . . . . . . . . . . . 26
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