Re: [rtcweb] STUN for keep-alive

"Dan Wing" <dwing@cisco.com> Fri, 16 September 2011 18:05 UTC

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From: "Dan Wing" <dwing@cisco.com>
To: "'Eric Rescorla'" <ekr@rtfm.com>, "'Christer Holmberg'" <christer.holmberg@ericsson.com>
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Date: Fri, 16 Sep 2011 11:07:56 -0700
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Cc: rtcweb@ietf.org
Subject: Re: [rtcweb] STUN for keep-alive
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> -----Original Message-----
> From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On
> Behalf Of Eric Rescorla
> Sent: Wednesday, September 14, 2011 10:32 AM
> To: Christer Holmberg
> Cc: rtcweb@ietf.org
> Subject: Re: [rtcweb] STUN for keep-alive
> 
> On Wed, Sep 14, 2011 at 10:20 AM, Christer Holmberg
> <christer.holmberg@ericsson.com> wrote:
> >
> > Hi,
> >
> >>One new concern in this context is maintaining the consent freshness.
> >>The browser needs to be sure that the recipient of traffic is stil
> responding in a way that can't be forged. It's likely RTCP provides
> this (though we'd need to analyze to be sure) but perhaps better would
> be to mandate STUN checks
> >>at enough frequency that you get some sort of level of freshness....
> maybe every 2 minutes or something.
> >
> > Please note that the STUN keep-alives are implemented using STUN
> indication messages, so there are no replies (nor does the receiver
> perform an authentication check).
> 
> 
> Oh... I had forgotten that.... that's not good.

The RTCP receiver reports should be adequate for 'consent freshness', no?
If I still like receiving the traffic, I'll report that I'm receiving it.
If I have crashed or disconnected or am not listening on that port, I won't.

-d