Interactive Connectivity Establishment (ICE): A Protocol for Network Address Translator (NAT) Traversal
draft-ietf-ice-rfc5245bis-15

Document Type Active Internet-Draft (ice WG)
Last updated 2017-11-03
Replaces draft-ietf-mmusic-rfc5245bis
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ICE                                                           A. Keranen
Internet-Draft                                               C. Holmberg
Obsoletes: 5245 (if approved)                                   Ericsson
Intended status: Standards Track                            J. Rosenberg
Expires: May 7, 2018                                         jdrosen.net
                                                        November 3, 2017

  Interactive Connectivity Establishment (ICE): A Protocol for Network
                   Address Translator (NAT) Traversal
                      draft-ietf-ice-rfc5245bis-15

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

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Keranen, et al.            Expires May 7, 2018                  [Page 1]
Internet-Draft                     ICE                     November 2017

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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
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