Re: [MMUSIC] Merging ICE aggressive and regular nomination (was Re: [tram] Comment on draft-williams-peer-redirect-01: might it not converge?)

Justin Uberti <juberti@google.com> Thu, 31 July 2014 19:09 UTC

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From: Justin Uberti <juberti@google.com>
Date: Thu, 31 Jul 2014 12:08:50 -0700
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To: =?UTF-8?Q?I=C3=B1aki_Baz_Castillo?= <ibc@aliax.net>
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Cc: Jonathan Lennox <jonathan@vidyo.com>, mmusic <mmusic@ietf.org>
Subject: Re: [MMUSIC] Merging ICE aggressive and regular nomination (was Re: [tram] Comment on draft-williams-peer-redirect-01: might it not converge?)
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On Thu, Jul 31, 2014 at 4:03 AM, Iñaki Baz Castillo <ibc@aliax.net> wrote:

> 2014-07-31 1:25 GMT+02:00 Justin Uberti <juberti@google.com>om>:
> >> I don’t think you want a rule of “most recently received USE-CANDIDATE”
> to
> >> determine the selected pair.  Checks will race each other, especially
> when
> >> the paths’ RTTs are very different.
> >
> >
> > Agree, although this would be addressed by any of:
> > - receipt of secure media is considered an indication of the selected
> pair
>
> Please, consider DTLS rather than secure media. Secure media is easy
> to handle regardless where it comes from. DTLS is not as you need a
> separate context for each tuple.
>
> If you mean that "the controlled must determine as selected pair that
> on which it receives the *first* DTLS ClientHello, being a previously
> validated ICE pair (so the source address is already known thanks to a
> previous ICE transaction)" then that sounds better for me.


As discussed earlier, DTLS does not require a separate context for each
tuple. DTLS should be agnostic about the lower layer protocol (and we
should probably create an errata to resolve this confusion).