TCP Candidates with Interactive Connectivity Establishment (ICE)
RFC 6544
| Document | Type | RFC - Proposed Standard (March 2012; No errata) | |
|---|---|---|---|
| Authors | Jonathan Rosenberg , Ari Keränen , Bruce Lowekamp , Adam Roach | ||
| Last updated | 2020-07-29 | ||
| Stream | Internent Engineering Task Force (IETF) | ||
| Formats | plain text html pdf htmlized (tools) htmlized bibtex | ||
| Reviews | |||
| Stream | WG state | WG Document | |
| Document shepherd | Flemming Andreasen | ||
| IESG | IESG state | RFC 6544 (Proposed Standard) | |
| Action Holders |
(None)
|
||
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Gonzalo Camarillo | ||
| IESG note | Flemming Andreasen (fandreas@cisco.com) is the document shepherd. | ||
| Send notices to | (None) | ||
Internet Engineering Task Force (IETF) J. Rosenberg
Request for Comments: 6544 jdrosen.net
Category: Standards Track A. Keranen
ISSN: 2070-1721 Ericsson
B. B. Lowekamp
Skype
A. B. Roach
Tekelec
March 2012
TCP Candidates with Interactive Connectivity Establishment (ICE)
Abstract
Interactive Connectivity Establishment (ICE) defines a mechanism for
NAT traversal for multimedia communication protocols based on the
offer/answer model of session negotiation. ICE works by providing a
set of candidate transport addresses for each media stream, which are
then validated with peer-to-peer connectivity checks based on Session
Traversal Utilities for NAT (STUN). ICE provides a general framework
for describing candidates but only defines UDP-based media streams.
This specification extends ICE to TCP-based media, including the
ability to offer a mix of TCP and UDP-based candidates for a single
stream.
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 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc6544.
Rosenberg, et al. Standards Track [Page 1]
RFC 6544 ICE TCP March 2012
Copyright Notice
Copyright (c) 2012 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
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.
Rosenberg, et al. Standards Track [Page 2]
RFC 6544 ICE TCP March 2012
Table of Contents
1. Introduction ....................................................4
2. Terminology .....................................................5
3. Overview of Operation ...........................................5
4. Sending the Initial Offer .......................................7
4.1. Gathering Candidates .......................................7
4.2. Prioritization .............................................8
4.3. Choosing Default Candidates ...............................10
4.4. Lite Implementation Requirements ..........................10
4.5. Encoding the SDP ..........................................11
5. Candidate Collection Techniques ................................12
5.1. Host Candidates ...........................................12
5.2. Server Reflexive Candidates ...............................13
5.3. NAT-Assisted Candidates ...................................13
5.4. UDP-Tunneled Candidates ...................................14
5.5. Relayed Candidates ........................................15
6. Receiving the Initial Offer and Answer .........................15
6.1. Considerations with Two Lite Agents .......................16
6.2. Forming the Check Lists ...................................16
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