Re: [MMUSIC] Adam Roach's No Objection on draft-ietf-mmusic-dtls-sdp-28: (with COMMENT) - All comments should now have been addressed
Christer Holmberg <christer.holmberg@ericsson.com> Thu, 07 September 2017 13:28 UTC
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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Christer Holmberg <christer.holmberg@ericsson.com>, Roman Shpount <rshpount@turbobridge.com>
CC: "draft-ietf-mmusic-dtls-sdp@ietf.org" <draft-ietf-mmusic-dtls-sdp@ietf.org>, Ben Campbell <ben@nostrum.com>, "mmusic@ietf.org" <mmusic@ietf.org>, Alexey Melnikov <aamelnikov@fastmail.fm>, Mirja Kühlewind <ietf@kuehlewind.net>, The IESG <iesg@ietf.org>, "mmusic-chairs@ietf.org" <mmusic-chairs@ietf.org>
Thread-Topic: [MMUSIC] Adam Roach's No Objection on draft-ietf-mmusic-dtls-sdp-28: (with COMMENT) - All comments should now have been addressed
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Date: Thu, 07 Sep 2017 13:28:13 +0000
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Subject: Re: [MMUSIC] Adam Roach's No Objection on draft-ietf-mmusic-dtls-sdp-28: (with COMMENT) - All comments should now have been addressed
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Hi, I have created a pull request, that removes the ufrag modification as a trigger for a new DTLS association (in case there is no tls-id). https://github.com/cdh4u/draft-dtls-sdp/pull/38 AFAIK, nobody has objected to change. Regards, Christer On 07/09/17 08:16, "mmusic on behalf of Christer Holmberg" <mmusic-bounces@ietf.org on behalf of christer.holmberg@ericsson.com> wrote: >Hi, > >>I think we should spell this out a little bit more. >> >>If tls-id was present in both offer and and answer, end points should >>use the model >>specified in this draft and only setup new DTLS association when either >>of tls-id values changed. > >Yes. > >>If tls-id was not present in either offer or answer, end points should >>the legacy mode defined in RFC 5763. In the legacy mode, new DTLS >>association is established when: >> >>a. transport parameters changed in either offer or answer >>b. fingerprints changed in either offer or answer >>c. setup roles, negotiated as a result of offer/answer exchange, are >>different from the setup roles before offer/answer exchange > >Yes. > >>When ICE is used, transport parameters, including c= and m= SDP line >>values, as well as values of ice-ufrag, ice-pwd, or other ICE related >>SDP attributes have no effect on >when new DTLS association is >>established, > >Currently, in the draft, the ufrag DOES have an impact, but the >suggestion is to change that. > >>After ICE restart, new DTLS association is only established due to >>changes in fingerprints in either offer or answer, or due to change in >>negotiated setup role. > >Yes. > >>Note that new DTLS association is not established due to change in >>tls-id in the offer if tls-id was not present in the answer and none of >>the other legacy mode requirements >were satisfied. > >Yes. > >>Also note, that in the legacy mode, new DTLS association can be >>established even if transport parameters, fingerprints and setup role in >>the answer are identical to >previously received values from the same >>end point, if transport parameters or fingerprints changed in the offer. > >Yes. > >So, the suggestion is to remove "ICE ufrag value" from the bullet list in >section 4. > >Regards, > >Christer > > > > > > > > > > > > > > > > >Hi, > >Some other issues have been raised, but I’d like to double check whether >someone has any issue with the suggestion to remove ufrag change as a >trigger for a new DTLS association? > >Based on the comments received so far, I don’t think anyone has objected. > >Regards, > >Christer > > > > > > > > > > >On 31/08/17 09:10, "Christer Holmberg" <christer.holmberg@ericsson.com> >wrote: > >>Hi, >> >>>>I have updated the PR. It should now address the IESG comments given by >>>> Adam, Ekr, Alexey and Mirja. >>>> >>>> https://github.com/cdh4u/draft-dtls-sdp/pull/35 >>>> >>>> >>>> In the latest commit (#7): >>>> >>>> - Section 7 (Transport Protocol Considerations) was removed. >>>> - Text regarding correlation of SDP and TLS connection was added to >>>>the >>>> Security Considerations (as requested by Mirja). >>>> >>>> Please let me know if there is something I¹ve forgot. >>> >>>The list of issues I posted to MMUSIC included the question about >>>whether ufrag change requires a DTLS restart in the absence of a >>>'tls-id'. There was a bit of discussion on that list which seemed to >>>conclude that it should *not*. I believe the document needs to reflect >>>this -- but I'd specifically ask the MMUSIC chairs whether they see >>>consensus on this point first. >> >> >>Correct, I forgot to mention that the PR yet does not address the ufrag >>issue, waiting for a WG consensus. >> >>Note that there is currently a discussion in RTCWEB on whether a ufrag >>change should trigger an ICE restart. But, as an ICE restart does not >>automatically trigger a DTLS restart I assume it won’t affect >>draft-dtls-sdp. Worth keeping in mind, though. >> >> >>>On the topic of looking over your changes: it's still easier to read a >>>text-form document than digging through XML source. Version numbers are >>>free. I encourage you to drop a new version whenever you ask people to >>>look at changes. >> >>I will submit a new version. >> >>Regards, >> >>Christer >> > >_______________________________________________ >mmusic mailing list >mmusic@ietf.org >https://www.ietf.org/mailman/listinfo/mmusic
- Re: [MMUSIC] Adam Roach's No Objection on draft-i… Christer Holmberg
- Re: [MMUSIC] Adam Roach's No Objection on draft-i… Adam Roach
- Re: [MMUSIC] Adam Roach's No Objection on draft-i… Ben Campbell
- Re: [MMUSIC] Adam Roach's No Objection on draft-i… Flemming Andreasen
- Re: [MMUSIC] Adam Roach's No Objection on draft-i… Cullen Jennings (fluffy)
- Re: [MMUSIC] Adam Roach's No Objection on draft-i… Christer Holmberg
- Re: [MMUSIC] Adam Roach's No Objection on draft-i… Christer Holmberg
- Re: [MMUSIC] Adam Roach's No Objection on draft-i… Roman Shpount
- Re: [MMUSIC] Adam Roach's No Objection on draft-i… Christer Holmberg
- Re: [MMUSIC] Adam Roach's No Objection on draft-i… Christer Holmberg
- Re: [MMUSIC] Adam Roach's No Objection on draft-i… Christer Holmberg