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Re: UDP source ports for HTTP/3 and QUIC

Nick Banks <nibanks@microsoft.com> Thu, 15 July 2021 13:40 UTC

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From: Nick Banks <nibanks@microsoft.com>
To: "ximaera@gmail.com" <ximaera@gmail.com>, "mikkelfj@gmail.com" <mikkelfj@gmail.com>
CC: "mnot@mnot.net" <mnot@mnot.net>, "quic@ietf.org" <quic@ietf.org>, "ietf-http-wg@w3.org" <ietf-http-wg@w3.org>
Subject: Re: UDP source ports for HTTP/3 and QUIC
Thread-Topic: UDP source ports for HTTP/3 and QUIC
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Date: Thu, 15 Jul 2021 13:40:03 +0000
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References: <3985895D-D420-4995-831E-332E33693B79@mnot.net> <6F79A78A-1DF8-4A48-9B7F-334B309C9C26@gmail.com>, <CALZ3u+bZ22N3iHkheK9hQ0qd5eGwuvTbQXL5M7n13uP+X=QM1Q@mail.gmail.com>
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You should definitely not make any assumptions around having unique source ports for QUIC connections. MsQuic already supports sharing the local port and is looking to make it a default behavior (for at least some scenarios) to avoid the fairly common "port exhaustion" problems we see with TCP. This doesn't necessarily mean all connections would be on the same source port, but only a few ports might be used for all connections.

Thanks,
- Nick


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________________________________
From: QUIC <quic-bounces@ietf.org> on behalf of Töma Gavrichenkov <ximaera@gmail.com>
Sent: Thursday, July 15, 2021 6:36 AM
To: Mikkel Fahnøe Jørgensen <mikkelfj@gmail.com>
Cc: Mark Nottingham <mnot@mnot.net>; IETF QUIC WG <quic@ietf.org>; HTTP Working Group <ietf-http-wg@w3.org>
Subject: Re: UDP source ports for HTTP/3 and QUIC

Peace,

On Thu, Jul 15, 2021, 11:57 AM Mikkel Fahnøe Jørgensen <mikkelfj@gmail.com<mailto:mikkelfj@gmail.com>> wrote:
As others have pointed out, I would suspect an RFC with a port list would quickly become outdated.

Speaking generally of lists of a content too dynamic and too host-specific to hardcode in RFCs, there once was a habit of putting them into DNS records.

--
Töma

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