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IETF RFC 6336
Last modified on Wednesday, July 20th, 2011
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Internet Engineering Task Force (IETF) M. Westerlund
Request for Comments: 6336 Ericsson
Updates: 5245 C. Perkins
Category: Standards Track University of Glasgow
ISSN: 2070-1721 July 2011
IANA Registry for Interactive Connectivity Establishment (ICE) Options
 Abstract
It has been identified that "Interactive Connectivity Establishment
(ICE): A Protocol for Network Address Translator (NAT) Traversal for
Offer/Answer Protocols" (RFC 5245) is missing a registry for ICE
options. This document defines this missing IANA registry and
updates 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 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/RFC 6336.
Copyright Notice
Copyright (c) 2011 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.
Westerlund & Perkins Standards Track PAGE 1 
RFC 6336 IANA Registry for ICE July 2011
Table of Contents
1. Introduction ....................................................2
2. Requirements Language ...........................................2
3. IANA Considerations .............................................3
3.1. ICE Options ................................................3
4. Security Considerations .........................................3
5. Acknowledgements ................................................4
6. References ......................................................4
6.1. Normative References .......................................4
6.2. Informative References .....................................4
1. Introduction
"Interactive Connectivity Establishment (ICE): A Protocol for Network
Address Translator (NAT) Traversal for Offer/Answer Protocols"
[RFC 5245] defines a concept of ICE options. However, the ICE RFC
fails to create an IANA registry for ICE options. As one ICE option
is under specification in [ECN-FOR-RTP], there is now a need to
create the registry.
RFC 5245 says: "ICE provides for extensibility by allowing an offer
or answer to contain a series of tokens that identify the ICE
extensions used by that agent. If an agent supports an ICE
extension, it MUST include the token defined for that extension in
the ice-options attribute".
Thus, as future extensions are defined, these ICE options need to be
registered with IANA to ensure non-conflicting identification. The
ICE option identifiers are used in signalling between the ICE
endpoints to negotiate extension support. RFC 5245 defines one
method of signalling these ICE options, using the Session Description
Protocol (SDP) with Offer/Answer [RFC 3264].
This document updates the ICE specification [RFC 5245] to define the
"Interactive Connectivity Establishment (ICE) Options" registry.
2. Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC 2119].
Westerlund & Perkins Standards Track PAGE 2
RFC 6336 IANA Registry for ICE July 2011
3. IANA Considerations
This document defines a registry "Interactive Connectivity
Establishment (ICE) Options" for ICE options that can be used in the
SDP "ice-options" attribute or other signalling parameters carrying
the ICE options.
3.1. ICE Options
An ICE option identifier MUST fulfill the ABNF [RFC 5234] syntax for
"ice-option-tag" as specified in [RFC 5245]. This syntax is
reproduced here for simplicity, but the authoritative definition is
in the ICE RFC:
ice-option-tag = 1*ice-char
ice-char = ALPHA / DIGIT / "+" / "/"
ICE options are of unlimited length according to the syntax; however,
they are RECOMMENDED to be no longer than 20 characters. This is to
reduce message sizes and allow for efficient parsing.
Registration of an ICE option in the "Interactive Connectivity
Establishment (ICE) Options" registry is done using the Specification
Required policy as defined in "Guidelines for Writing an IANA
Considerations Section in RFCs" [RFC 5226].
A registration request MUST include the following information:
o The ICE option identifier to be registered
o Name, Email, and Address of a contact person for the registration
o Organization or individuals having the change control
o Short description of the ICE extension to which the option relates
o Reference(s) to the specification defining the ICE option and the
related extensions
This document registers no ICE option.
4. Security Considerations
As this document defines an IANA registry for an already existing
concept, there are no new security considerations.
Westerlund & Perkins Standards Track PAGE 3
RFC 6336 IANA Registry for ICE July 2011
5. Acknowledgements
The authors would like to thank the people who reviewed the document
and provided feedback: Flemming Andreasen, Mykyta Yevstifeyev, Amanda
Baber, and Brian Carpenter.
6. References
6.1. Normative References
[RFC 2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC 5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an
IANA Considerations Section in RFCs", BCP 26, RFC 5226,
May 2008.
[RFC 5234] Crocker, D., Ed., and P. Overell, "Augmented BNF for
Syntax Specifications: ABNF", STD 68, RFC 5234,
January 2008.
[RFC 5245] Rosenberg, J., "Interactive Connectivity Establishment
(ICE): A Protocol for Network Address Translator (NAT)
Traversal for Offer/Answer Protocols", RFC 5245,
April 2010.
6.2. Informative References
[ECN-FOR-RTP]
Westerlund, M., Johansson, I., Perkins, C., O'Hanlon, P.,
and K. Carlberg, "Explicit Congestion Notification (ECN)
for RTP over UDP", Work in Progress, July 2011.
[RFC 3264] Rosenberg, J. and H. Schulzrinne, "An Offer/Answer Model
with Session Description Protocol (SDP)", RFC 3264,
June 2002.
Westerlund & Perkins Standards Track PAGE 4
RFC 6336 IANA Registry for ICE July 2011
Authors' Addresses
Magnus Westerlund
Ericsson
Farogatan 6
SE-164 80 Kista
Sweden
Phone: +46 10 714 82 87
EMail: magnus.westerlund@ericsson.com
Colin Perkins
University of Glasgow
School of Computing Science
Glasgow G12 8QQ
United Kingdom
EMail: csp@csperkins.org
Westerlund & Perkins Standards Track PAGE 5
RFC TOTAL SIZE: 8228 bytes
PUBLICATION DATE: Wednesday, July 20th, 2011
LEGAL RIGHTS: The IETF Trust (see BCP 78)
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