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Re: [rtcweb] Isolating data channels (Re: Asking TLS for help with media isolation)

Michael Tuexen <Michael.Tuexen@lurchi.franken.de> Mon, 07 April 2014 17:38 UTC

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From: Michael Tuexen <Michael.Tuexen@lurchi.franken.de>
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Date: Mon, 07 Apr 2014 19:38:09 +0200
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To: Martin Thomson <martin.thomson@gmail.com>
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Subject: Re: [rtcweb] Isolating data channels (Re: Asking TLS for help with media isolation)
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On 07 Apr 2014, at 19:23, Martin Thomson <martin.thomson@gmail.com> wrote:

> On 7 April 2014 10:20, Harald Alvestrand <harald@alvestrand.no> wrote:
>> I was actually thinking "protocol" as in the string that goes into the
>> datachannel setup packets. PPIDs would work too for separating
>> browser-to-brower from app-to-app, but I wasn't thinking of them.
> 
> That would require carving out a space to use right now.  That
> impinges to much on application autonomy for my liking.
> 
>> Yes, data channels do cost something to set up. But we're already paying the
>> DTLS tax in order to set up the keying, so it's "just" another
>> request/response. How many extra round trips does the SCTP setup add?
> 
> 2.
Right now: Correct. But one could optimise the initial handshake...

Best regards
Michael
> 
>> (and to Matthew: At least we wouldn't have *yet* another congestion context to
>> manage, which would be the case with a separate TCP connection. There are
>> always tradeoffs.)
> 
> I'm certain that Matthew wasn't talking about TCP.
> 
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