Re: [MMUSIC] [rtcweb] What goes into c= line address when FQDN is used for the default candidate?

youenn fablet <youennf@gmail.com> Thu, 07 February 2019 16:44 UTC

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From: youenn fablet <youennf@gmail.com>
Date: Thu, 7 Feb 2019 08:44:24 -0800
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To: Roman Shpount <roman@telurix.com>
Cc: Justin Uberti <juberti@google.com>, Simon Perreault <sperreault@jive.com>, RTCWeb IETF <rtcweb@ietf.org>, mmusic WG <mmusic@ietf.org>
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Subject: Re: [MMUSIC] [rtcweb] What goes into c= line address when FQDN is used for the default candidate?
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FWIW, Safari Tech Preview introduced last year an mDNS experiment
which is close to Chrome experiment.
This experiment is now on by default in Safari Tech Preview.

As of the case of no ICE candidate at all, this already happens in
Safari 12: by default, mode 3 is used.
As mentioned by Harald, peer reflexive candidates are already used in
some products to enable Safari connection with SFUs or Chrome
instances.

In some cases, implementations had to be updated to better cope with
this, in particular the case of a successful connection triggered by
peer reflexive candidates, leading to not expose server reflexive
candidates to the web site.
Providing guidance to implementors in that area might indeed be good.

Le jeu. 7 févr. 2019 à 08:01, Roman Shpount <roman@telurix.com> a écrit :
>
> Hi All,
>
> From what I can see there is a new problem identified during mDNS discussion with using FQDN: If all the candidates are FQDN and these names do not resolve or resolve to more then one address, so all the candidates will end up being ignored. ICE agent might end up with no remote candidates and no candidate pairs to form. I think  RFC 8445 does not handle this situation, but I might be missing something.
>
> P.S. I am not arguing against FQDN, I am just trying to figure out what needs to be done to get this documented and operational.
> _____________
> Roman Shpount
> _______________________________________________
> rtcweb mailing list
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> https://www.ietf.org/mailman/listinfo/rtcweb