Re: [rtcweb] [MMUSIC] What goes into c= line address when FQDN is used for the default candidate?
Justin Uberti <juberti@google.com> Fri, 01 February 2019 23:28 UTC
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From: Justin Uberti <juberti@google.com>
Date: Fri, 01 Feb 2019 15:27:56 -0800
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To: Christer Holmberg <christer.holmberg@ericsson.com>
Cc: Roman Shpount <roman@telurix.com>, Simon Perreault <sperreault@jive.com>, "Dale R. Worley" <worley@ariadne.com>, RTCWeb IETF <rtcweb@ietf.org>, mmusic WG <mmusic@ietf.org>
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Subject: Re: [rtcweb] [MMUSIC] What goes into c= line address when FQDN is used for the default candidate?
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That works for me as well - it then becomes a clarification of 5245, rather than a removal of functionality. On Fri, Feb 1, 2019 at 1:17 PM Christer Holmberg < christer.holmberg@ericsson.com> wrote: > > Hi, > > > In this case section 4.1 of ice-sip-sdp should be updated to allow FQDN > in > > connection-address and, perhaps specify that FWDN which return multiple > > results should be ignored. > > I suggest MUST be ignored, perhaps with a note saying that a future > specification will have to define how to use FQDNs that return multiple > results. > > > Would this work for everyone? > > It would work for me. > > Regards, > > Christer > > > > On Fri, Feb 1, 2019 at 4:02 PM Christer Holmberg < > christer.holmberg@ericsson.com> wrote: > > I have no problem with allowing FQDNs - as long as they result in a SINGLE > address:port. > > > If we want to define ICE usage of FDNSs resulting in MULTIPLE > addresses:ports, I really think that should be a separate document - it > should NOT be added as a last minute thing to draft-ice-sip-sdp. > > > ...and, yes, perhaps such work would also affect 8445. > > > Regards, > > > Christer > > > > > > > ------------------------------ > *From:* rtcweb <rtcweb-bounces@ietf.org> on behalf of Roman Shpount < > roman@telurix.com> > *Sent:* Friday, February 1, 2019 10:22 PM > *To:* Justin Uberti > *Cc:* Simon Perreault; Dale R. Worley; RTCWeb IETF; mmusic WG > *Subject:* Re: [rtcweb] [MMUSIC] What goes into c= line address when FQDN > is used for the default candidate? > > On Fri, Feb 1, 2019 at 2:39 PM Justin Uberti <juberti@google.com> wrote: > > This has all been discussed at length in rtcweb and I don't think any > significant changes are needed, although I tend to think that we should > restore the removed FQDN text from mmusic-ice-sip-sdp, which is the only > thing not in alignment at this point in time. > > > I agree that FQDN should be put back into connection-address definition, > but the portion which talks about handling it is completely broken. > > Quoting 5245 <https://tools.ietf.org/html/rfc5245#section-15.1>: > > <connection-address>: is taken from RFC 4566 <https://tools.ietf.org/html/rfc4566> [RFC4566 <https://tools.ietf.org/html/rfc4566>]. It is the > IP address of the candidate, allowing for IPv4 addresses, IPv6 > addresses, and *fully qualified domain names (FQDNs).* When parsing > this field, an agent can differentiate an IPv4 address and an IPv6 > > address by presence of a colon in its value - the presence of a > colon indicates IPv6. An agent MUST ignore candidate lines that > include candidates with IP address versions that are not supported > or recognized. An IP address SHOULD be used, but an FQDN MAY be > used in place of an IP address. In that case, when receiving an > offer or answer containing an FQDN in an a=candidate attribute, > the FQDN is looked up in the DNS first using an AAAA record > (assuming the agent supports IPv6), and if no result is found or > the agent only supports IPv4, using an A. If the DNS query > returns more than one IP address, one is chosen, and then used for > the remainder of ICE processing. > > > I think it was discussed in quite a detail why using a random DNS > resolution result is not going to work here.. > > The only options we have here are: > > a. Fix FQDN connection address handling. Probably the most logical way of > dealing with this would be to specify that candidate with FQDN should be > converted as a result of DNS resolution into multiple candidates, with each > candidate corresponding to A or AAAA record in DNS query result. We will > also need to specify how FQDN candidate gets applied to c= line address. > Something that says IN IP4 FQDN, if any A records exist for this DNS name > and IN IP6 FQDN if only AAAA records exist. Once candidate is nominated, > address family in c= line should match address family used for > communications. This will definitely require a lot more work and discussion. > > b. Specify that FQDN connection addresses should be ignored until their > handling is defined in a future specification. This seems easy and only > requires a sentence or two to fix. > > Regards, > _____________ > Roman Shpount > >
- Re: [rtcweb] [MMUSIC] What goes into c= line addr… Roman Shpount
- Re: [rtcweb] [MMUSIC] What goes into c= line addr… Justin Uberti
- Re: [rtcweb] [MMUSIC] What goes into c= line addr… Justin Uberti
- Re: [rtcweb] [MMUSIC] What goes into c= line addr… Roman Shpount
- Re: [rtcweb] [MMUSIC] What goes into c= line addr… Justin Uberti
- Re: [rtcweb] [MMUSIC] What goes into c= line addr… Roman Shpount
- Re: [rtcweb] [MMUSIC] What goes into c= line addr… Justin Uberti
- Re: [rtcweb] [MMUSIC] What goes into c= line addr… Roman Shpount
- Re: [rtcweb] [MMUSIC] What goes into c= line addr… Justin Uberti
- Re: [rtcweb] [MMUSIC] What goes into c= line addr… Christer Holmberg
- Re: [rtcweb] [MMUSIC] What goes into c= line addr… Roman Shpount
- Re: [rtcweb] [MMUSIC] What goes into c= line addr… Roman Shpount
- Re: [rtcweb] [MMUSIC] What goes into c= line addr… Christer Holmberg
- Re: [rtcweb] [MMUSIC] What goes into c= line addr… Christer Holmberg
- Re: [rtcweb] [MMUSIC] What goes into c= line addr… Roman Shpount
- Re: [rtcweb] [MMUSIC] What goes into c= line addr… Christer Holmberg
- Re: [rtcweb] [MMUSIC] What goes into c= line addr… Justin Uberti
- Re: [rtcweb] [MMUSIC] What goes into c= line addr… Alan Ford
- Re: [rtcweb] [MMUSIC] What goes into c= line addr… Roman Shpount
- Re: [rtcweb] [MMUSIC] What goes into c= line addr… Christer Holmberg
- Re: [rtcweb] [MMUSIC] What goes into c= line addr… Justin Uberti
- Re: [rtcweb] [MMUSIC] What goes into c= line addr… Roman Shpount
- Re: [rtcweb] [MMUSIC] What goes into c= line addr… Harald Alvestrand
- Re: [rtcweb] [MMUSIC] What goes into c= line addr… Roman Shpount
- Re: [rtcweb] [MMUSIC] What goes into c= line addr… Justin Uberti
- Re: [rtcweb] [MMUSIC] What goes into c= line addr… Roman Shpount
- Re: [rtcweb] [MMUSIC] What goes into c= line addr… youenn fablet
- Re: [rtcweb] [MMUSIC] What goes into c= line addr… Lorenzo Miniero