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Re: [rtcweb] ICE-Mismatch and WebRTC

Kevin Dempsey <kevindempsey70@gmail.com> Mon, 14 July 2014 09:10 UTC

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Date: Mon, 14 Jul 2014 10:10:11 +0100
Message-ID: <CAMvTgcfyK0Z1BppCQimt=-83LQ3N_qROjZZy3mUMwpVwrruvng@mail.gmail.com>
From: Kevin Dempsey <kevindempsey70@gmail.com>
To: Emil Ivov <emcho@jitsi.org>
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Subject: Re: [rtcweb] ICE-Mismatch and WebRTC
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The initial offer is sent with only host candidates and the c= line gets
mangled by Alice's gateway* to match her external IP. Alice's client then
'discovers' the external address using STUN and sends the srflx candidate
which happens to match the mangled c= line.

*an application gateway that claims to be 'SIP aware' and modifies the SDP
to match the externally visible IP address. I suppose it may also modify
the candidate line if it does a simple match/replace.


On 14 July 2014 09:56, Emil Ivov <emcho@jitsi.org> wrote:

> On Mon, Jul 14, 2014 at 10:06 AM, Kevin Dempsey
> <kevindempsey70@gmail.com> wrote:
> > In Emil's example, Bob might later receive a trickled candidate:
> > a=candidate:1 1 UDP 1130706431 *87.65.43.21* 5000 typ srflx raddr
> > 192.168.0.1 rport 5000
> > which, if it was in the initial offer, would mean there was no mismatch.
>
> How would that happen?
>
> If you are thinking of a trickle ICE capable middle box then it
> could/should simply do it all at once. What reason would it have to
> delay the extra candidate?
>
> Emil
>
> >
> > On 12 July 2014 16:28, Justin Uberti <juberti@google.com> wrote:
> >>
> >> Agreed, with a special case for the no-candidates trickle ICE situation.
> >>
> >> On Jul 11, 2014 5:20 PM, "Roman Shpount" <roman@telurix.com> wrote:
> >>>
> >>> I would agree with:
> >>>
> >>> 1. Must fail if c=/m= line IP does not match any candidate. Must also
> >>> fail if rtcp attribute does not match any RTCP candidates.
> >>>
> >>> 2. Must fail if "ice-mismatch" attribute is present same as no ICE
> >>>
> >>> 3. Port 0 in m= line to disable the line must be understood
> >>>
> >>> 4. c= line with 0.0.0.0 must fail
> >>>
> >>> Does this make sense?
> >>> _____________
> >>> Roman Shpount
> >>>
> >>>
> >>
> >> _______________________________________________
> >> rtcweb mailing list
> >> rtcweb@ietf.org
> >> https://www.ietf.org/mailman/listinfo/rtcweb
> >>
> >
> >
> > _______________________________________________
> > rtcweb mailing list
> > rtcweb@ietf.org
> > https://www.ietf.org/mailman/listinfo/rtcweb
> >
>
>
>
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