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IETF RFC 3266

Support for IPv6 in Session Description Protocol (SDP)

Last modified on Friday, June 7th, 2002

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Network Working Group                                           S. Olson
Request for Comments: 3266                                     Microsoft
Updates: 2327                                               G. Camarillo
Category: Standards Track                                     Ericsson
                                                             A. B. Roach
                                                             dynamicsoft
                                                               June 2002


         Support for IPv6 in Session Description Protocol (SDP)

 Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

 Copyright Notice

   Copyright © The Internet Society (2002).  All Rights Reserved.

 Abstract

   This document describes the use of Internet Protocol Version 6 (IPv6)
   addresses in conjunction with the Session Description Protocol (SDP).
   Specifically, this document clarifies existing text in SDP with
   regards to the syntax of IPv6 addresses.

1. Introduction

   SDP is intended for describing multimedia sessions for the purposes
   of session announcement, session invitation, and other forms of
   multimedia session initiation.  It is a text format description that
   provides many details of a multimedia session including: the
   originator of the session, a URL related to the session, the
   connection address for the session media(s), and optional attributes
   for the session media(s).  Each of these pieces of information may
   involve one or more IPv6 addresses.  The ABNF for IP addresses in SDP
   currently leaves the syntax for IPv6 addresses undefined.  This
   document attempts to complete the ABNF to include IPv6 addresses.

   Accordingly, the address type "IP6" indicating an IPv6 address,
   should be allowed in the connection field, "c=", of the SDP.  The
   ABNF already reflects this, though the "Connection Data" text under
   section 6 of RFC 2328 currently only defines the "IP4" address type.




Olson, et. al.              Standards Track                  PAGE 1 top


RFC 3266 Support for IPv6 in Session Description Protocol June 2002 2. Terminology 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 [5]. 3. Syntax RFC 2373 [1] gives an ABNF for the text representation of IPv6 addresses in Appendix B. RFC 2732 [3] covers the text representation of IPv6 addresses when used within a URL. Using the ABNF described in these documents, the following updated ABNF for SDP is proposed. uri = ; defined in RFC 1630 and RFC 2732 multicast-address = IP4-multicast / IP6-multicast IP4-multicast = m1 3*( "." decimal-uchar ) "/" ttl [ "/" integer ] ; IPv4 multicast addresses may be in the ; range 224.0.0.0 to 239.255.255.255 m1 = ("22" ("4"/"5"/"6"/"7"/"8"/"9")) / ("23" DIGIT )) IP6-multicast = hexpart ; IPv6 address starting with FF addr = FQDN / unicast-address FQDN = 4*(alpha-numeric/"-"/".") ; fully qualified domain name as specified ; in RFC 1035 unicast-address = IP4-address / IP6-address IP4-address = b1 3*("." decimal-uchar) / "0.0.0.0" b1 = decimal-uchar ; less than "224"; not "0" or "127" ; The following is from RFC 2373 Appendix B. It is a direct copy. IP6-address = hexpart [ ":" IP4-address ] hexpart = hexseq / hexseq "::" [ hexseq ] / "::" [ hexseq ] Olson, et. al. Standards Track PAGE 2 top

RFC 3266 Support for IPv6 in Session Description Protocol June 2002 hexseq = hex4 *( ":" hex4) hex4 = 1*4HEXDIG 4. Example SDP description with IPv6 addresses The following is an example SDP description using the above ABNF for IPv6 addresses. In particular, the origin and connection fields contain IPv6 addresses. v=0 o=nasa1 971731711378798081 0 IN IP6 2201:056D::112E:144A:1E24 s=(Almost) live video feed from Mars-II satellite p=+1 713 555 1234 c=IN IP6 FF1E:03AD::7F2E:172A:1E24 t=3338481189 3370017201 m=audio 6000 RTP/AVP 2 a=rtpmap:2 G726-32/8000 m=video 6024 RTP/AVP 107 a=rtpmap:107 H263-1998/90000 5. Note for implementors An implementation may receive an SDP session description with an IPv6 address whose format [1] is internally that of an IPv4 mapped address. Note that such an address is actually the address of an IPv4-only node, and implementors are warned to interpret IPv4 mapped addresses as equivalent to IP4. 6. IANA Considerations This document updates the definition of the IP6 addrtype parameter found in RFC 2327. 7. Security Considerations No additional considerations above what is stated in section 7 of RFC 2327. 8. References [1] Hinden, R. and S. Deering, "IP Version 6 Addressing Architecture", RFC 2373, July 1998. [2] Handley, M. and V. Jacobson, "SDP: Session Description Protocol", RFC 2327, April 1998. Olson, et. al. Standards Track PAGE 3 top

RFC 3266 Support for IPv6 in Session Description Protocol June 2002 [3] Hinden, R., Carpenter, B. and L. Masinter, "Format for Literal IPv6 Addresses in URL's", RFC 2732, December 1999. [4] Crocker, D. and P. Overell, "Augmented BNF for Syntax Specifications: ABNF", RFC 2234, November 1997. [5] Bradner, S., "Key words for Use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. 9. Authors' Addresses Sean Olson Microsoft One Microsoft Way Redmond, WA 98052 USA EMail: seanol@microsoft.com Gonzalo Camarillo Ericsson Advanced Signalling Research Lab. FIN-02420 Jorvas Finland Phone: +358 9 299 3371 Fax: +358 9 299 3118 EMail: Gonzalo.Camarillo@ericsson.com Adam Roach dynamicsoft 5100 Tennyson Parkway Suite 1200 Plano, TX 75024 USA EMail: adam@dynamicsoft.com Voice: <sip:adam@dynamicsoft.com> Olson, et. al. Standards Track PAGE 4 top

RFC 3266 Support for IPv6 in Session Description Protocol June 2002 10. Full Copyright Statement Copyright © The Internet Society (2002). All Rights Reserved. This document and translations of it may be copied and furnished to others, and derivative works that comment on or otherwise explain it or assist in its implementation may be prepared, copied, published and distributed, in whole or in part, without restriction of any kind, provided that the above copyright notice and this paragraph are included on all such copies and derivative works. However, this document itself may not be modified in any way, such as by removing the copyright notice or references to the Internet Society or other Internet organizations, except as needed for the purpose of developing Internet standards in which case the procedures for copyrights defined in the Internet Standards process must be followed, or as required to translate it into languages other than English. The limited permissions granted above are perpetual and will not be revoked by the Internet Society or its successors or assigns. This document and the information contained herein is provided on an "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Acknowledgement Funding for the RFC Editor function is currently provided by the Internet Society. Olson, et. al. Standards Track PAGE 5 top

Support for IPv6 in Session Description Protocol (SDP) RFC TOTAL SIZE: 8693 bytes PUBLICATION DATE: Friday, June 7th, 2002 LEGAL RIGHTS: The IETF Trust (see BCP 78)


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