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Re: UDP source ports for HTTP/3 and QUIC

Stefan Eissing <stefan.eissing@greenbytes.de> Thu, 15 July 2021 09:53 UTC

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Subject: Re: UDP source ports for HTTP/3 and QUIC
From: Stefan Eissing <stefan.eissing@greenbytes.de>
In-Reply-To: <20210715092937.GC27830@1wt.eu>
Date: Thu, 15 Jul 2021 11:53:46 +0200
Cc: Mikkel Fahnøe Jørgensen <mikkelfj@gmail.com>, Mark Nottingham <mnot@mnot.net>, IETF QUIC WG <quic@ietf.org>, HTTP Working Group <ietf-http-wg@w3.org>
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To: Willy Tarreau <w@1wt.eu>
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> Am 15.07.2021 um 11:29 schrieb Willy Tarreau <w@1wt.eu>:
> 
> On Thu, Jul 15, 2021 at 10:56:28AM +0200, Mikkel Fahnøe Jørgensen wrote:
>> It is perhaps worth noting that due to QUIC (optionally) having unique
>> connection identifiers, it is feasible to have many connections on the same
>> source port. Therefore that could be a recommendation in cases where some
>> source ports might be blocked.
> 
> I think that this is an excellent idea! The simple fact that this is
> being discussed precisely is because the source port serves no purpose
> here other than being compatible with UDP. So basically we could have
> a recommendation that each application preferably uses a single socket
> and source port for outgoing communication. This will also lower the
> stress on source port allocation (and recycling) as well as the need
> for file descriptors.

Yikes, all QUIC packets will potentially arrive a the same child listener. Let's go all the way and defined a fixed source port. ^^

- Stefan

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