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Re: Q and L loss bits: which is which?

Dmitri Tikhonov <dtikhonov@litespeedtech.com> Tue, 19 November 2019 15:08 UTC

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Date: Tue, 19 Nov 2019 10:08:29 -0500
From: Dmitri Tikhonov <dtikhonov@litespeedtech.com>
To: alexandre.ferrieux@orange.com
Cc: IETF QUIC WG <quic@ietf.org>
Subject: Re: Q and L loss bits: which is which?
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On Tue, Nov 19, 2019 at 03:49:08PM +0100, alexandre.ferrieux@orange.com wrote:
> Thanks for your offer: experimentations are very welcome !
> You're right we forgot to just define which is what, we'll fix the
> draft shortly. We'll choose: 0x10 for Q and 0x08 for L.
> This means the first byte layout becomes:
>  |0|1|S|Q|L|K|P P|

Thank you!

I also assume that these two bits would now be outside of the header
protection?  That is, the short header header protection mask [1] is
now 0x7 instead of 0x1F?  This is not mentioned in your draft, but I
don't see how an observer could get at those bits otherwise.

  - Dmitri.

1. https://tools.ietf.org/html/draft-ietf-quic-tls-24#section-5.4.1

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