Hi, The draft defines how to express IPv6 addresses in SDP. How you use this format is up to the application (i.e., outside the scope of this draft). Remember that SDP is used by many protocols (SIP, SAP, MGCP, RTSP).
A good example is SIP. An MMUSIC document defines how to use SDP in conjunction with SIP. 3G systems, for instance, will use SDP and IPv6 together. They will define how to use this format when establishing a session. They will explicitly say which address you have to put in the c line (IPv4, or IPv6 or maybe FQDN). Therefore, comments about the actual format are very welcome. Other comments are interesting for other documents, but I do not think the IESG has to be involved in such a discussion until those documents are done. Regards, Gonzalo "Hesham Soliman (ERA)" wrote: > > I think Gonzalo already answered this. > Further clarifications are below, but > we might be getting off-topic for this draft. > > > (this way the receiving IPv6 node can decide the mechanism > > > > to reach the > > > > IPv4-address; that is, if u= can contain either IPv4 or > > > > IPv6 address) > > > > I'll restate this: this depends on the definition of u=. > > > > If 'u' can have: > > 1) only IPv6 addresses, using mapped address is fine > > 2) either iPv6 or IPv4 address, IMO IPv4 should be used > > when _sending_ > > the packet > > => See below. > > > > > We're arguing about point 2). My point is that if address > > can be either, > > some nodes [a dual stack] can receive values with u=[ipv4] > > _anyway_, and > > must be able to cope with them. > > => I was not conerned about dual stacked nodes, > they'll obviously understand. Some systems > require IPv6 only though, Others might prefer > to run IPv6 only for simplicity, so you shouldn't > assume dual stacks all the time. > > Hesham > > _______________________________________________ > mmusic mailing list > [EMAIL PROTECTED] > https://www1.ietf.org/mailman/listinfo/mmusic -- Gonzalo Camarillo Phone : +1 212 939 71 71 Columbia University Mobile: +358 40 702 35 35 472 Computer Science Building Fax : +358 9 299 30 52 1214 Amsterdam Ave., Mail Code 0401 http://www.hut.fi/~gonzalo New York, NY 10027 USA [EMAIL PROTECTED] -------------------------------------------------------------------- IETF IPng Working Group Mailing List IPng Home Page: http://playground.sun.com/ipng FTP archive: ftp://playground.sun.com/pub/ipng Direct all administrative requests to [EMAIL PROTECTED] --------------------------------------------------------------------
