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Re: Grease the packet type?

Ryan Hamilton <rch@google.com> Tue, 11 January 2022 15:07 UTC

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From: Ryan Hamilton <rch@google.com>
Date: Tue, 11 Jan 2022 07:07:03 -0800
Message-ID: <CAJ_4DfQB9PhuPpRvv7y=kCKkTnHspFquM30ai-fiGCeoRk=2MQ@mail.gmail.com>
Subject: Re: Grease the packet type?
To: Martin Duke <martin.h.duke@gmail.com>
Cc: IETF QUIC WG <quic@ietf.org>
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To make sure I'm clear on the proposal, the idea is basically to make the
long header packet type values different for different versions
(specifically v2)? This means that v1 and v2 will not be wire compatible,
right? I'm slightly loath to open up v2 to wire changes because I fear
it'll turn into a honeypot for other attractive chances and may bog down
the release of v2. But I don't feel strongly and the idea seems nice in
general!

On Mon, Jan 10, 2022 at 3:24 PM Martin Duke <martin.h.duke@gmail.com> wrote:

> This issue hasn't gotten much attention in QUICv2:
> https://github.com/quicwg/quic-v2/issues/7
>
> Basically, we could simply reassign the packet type codepoints in v2 to so
> that Initials are a codepoint other than 0b00.
>
> For example:
> Initial = 0b01
> 0-RTT = 0b10
> Handshake = 0b11
> Retry = 0b00
>
> To the extent the purpose of v2 is grease stuff, this seems like a pretty
> simple and good thing to do. To the extent it's supposed to exercise
> version negotiation, this change is a needless distraction.
>
> Does the WG think this is worthwhile? I hope to issue the next draft with
> the provisional version number allocation, so this is the right time to
> make this sort of change.
>
> Martin
>

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