Re: [AVTCORE] Running multiple quic sessions over the same address/port pair

[Spencer Dawkins at IETF <[e-mail]>]

I should add one more point.

On Sat, Feb 26, 2022 at 11:37 PM Roman Shpount <[e-mail]> wrote:

> On Sun, Feb 27, 2022 at 12:18 AM Bernard Aboba <[e-mail]>
> wrote:
>
>> On Feb 26, 2022, at 20:50, Roman Shpount <[e-mail]> wrote:
>> [BA] This should be possible. The means will differ depending on whether
>> we are talking about P2P QUIC (where you could use Connection-Id) or
>> something higher up the stack. Multiplexing as defined in rfc7983bis wasn’t
>> implemented in the P2P (g)QUIC Origin trial since the QUIC implementation
>> was pre-standard and lacked the capability. So only one connection was
>> allowed. At the time the focus was on P2P data not media, but in the
>> absence of priority support, it seemed desirable to allow distinct data and
>> media connections that might be constructed to use different cc algorithms.
>>
>>
> This is very interesting and can be one more reason to use QUICK instead
> of DTLS. The problem would be to map a pair of tls-id to a Connection-Id.
>

(After agreeing with Bernard's points)

Within the "Media Over QUIC" conspiracy, we have some folks that are
assuming they would use datagrams ("because datagrams"), and other folks
assuming they would use streams ("because multiplexing"). One of the things
that I'm finding in conversations on that side of the fence is that the
choice isn't obvious (even though it's obvious to everyone, it's not the
same obvious answer).

The QUIC working group started out thinking that they obviously needed some
way to multiplex datagrams, but then discovered that there were a lot of
(potentially conflicting) reasons to want to multiplex datagrams, so they
punted that to the application, in
https://www.ietf.org/archive/id/draft-ietf-quic-datagram-10.html#name-multiplexing-datagrams
.

I wrote about this in more detail, in
https://spencerdawkins.github.io/sdp-rtp-quic-questions/draft-dawkins-sdp-rtp-quic-questions.html#name-quic-datagram-multiplexing
.

(I *really *need to update my sdp-rtp-quic*-questions* draft - I wasn't
expecting that, but I'm happy to do it)

Best,

Spencer


> _____________
> Roman Shpount
>
>