Re: [rtcweb] Data transfer

Randell Jesup <randell-ietf@jesup.org> Mon, 19 September 2011 07:32 UTC

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Date: Mon, 19 Sep 2011 03:31:32 -0400
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Subject: Re: [rtcweb] Data transfer
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On 9/19/2011 3:00 AM, Hadriel Kaplan wrote:
> On Sep 19, 2011, at 12:23 AM, Randell Jesup wrote:
>
>>> 3. Use TCP over UDP
>> This is what I had been assuming we'd do.  It might have been nice to use
>> SCTP-over-UDP instead; that would cover more cases without having to drop
>> into doing network protocols in javascript for example, but it doesn't
>> appear there's an extant open-source example, so it's a hard sell.
>>
> I think you'll want to do whatever-shim-transport-it-is in the browser rather than in JS no matter what.  As much as I hate to say it, SCTP over UDP kinda makes sense, given all of it's various modes of operation.
>
> Whatever gets picked, it needs to support fragmentation at a layer above UDP to make it through various NATs/firewalls/CGNs.
>
> -hadriel
> p.s. why do you say there's no open-source of SCTP?  FreeBSD has it, though it might be out of date;  sctplib is also under LGPL (http://www.sctp.de/sctp-download.html).
I meant SCTP-over-UDP, not direct SCTP.  (Yes, I assume a working SCTP can
be transformed into SCTP-over-UDP, but without spending some time it's hard
for me to say what level of work this would involve and the amount of testing
needed.

I'm now tempted to add *another* item to my plate...  (I need a helper just
to carry it...)  :-)

-- 
Randell Jesup
randell-ietf@jesup.org