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Re: UDP source ports for HTTP/3 and QUIC

Töma Gavrichenkov <ximaera@gmail.com> Thu, 15 July 2021 11:14 UTC

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From: Töma Gavrichenkov <ximaera@gmail.com>
Date: Thu, 15 Jul 2021 14:14:19 +0300
Message-ID: <CALZ3u+ZELW79rx8=DkS0F0wtoDgWdqu0Bi9VB_-STrj1hCUtUw@mail.gmail.com>
Subject: Re: UDP source ports for HTTP/3 and QUIC
To: Willy Tarreau <w@1wt.eu>
Cc: IETF QUIC WG <quic@ietf.org>, HTTP Working Group <ietf-http-wg@w3.org>, stefan.eissing@greenbytes.de
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Peace,

So basically we could have
> a recommendation that each application preferably uses a single socket
> and source port for outgoing communication.


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


This would irretrievably break ECMP/UCMP 5-tuple hashes pretty much
everywhere in transit.  The closer to the endpoint the worse.

(I understand you were just joking but wanted to point that out just in
case someone takes this seriously)

--
Töma

>

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