Re: Working Group Last Call: QUIC grease bit

Martin Thomson <> Sun, 07 November 2021 00:23 UTC

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Date: Sun, 07 Nov 2021 11:23:17 +1100
From: Martin Thomson <>
Subject: Re: Working Group Last Call: QUIC grease bit
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On Sat, Nov 6, 2021, at 03:23, Mirja Kuehlewind wrote:
> I reviewed this short draft and it's clear and ready.
> I have two minor questions but nothing that holds up the draft, nor 
> necessarily needs any changes.
> The draft has a 7 day limit to remember the transport parameter. Is 
> there a reason for this specific value or is that a rather random value?

This matches the time in TLS for a 0-RTT-capable ticket.

> The draft says rather late that new extensions using the QUIC bit can 
> be negotiated without using the grease_quic_bit transport parameter. 
> While reading the previous text though I was mostly wondering why I 
> would want negotiate my new parameter in parallel to the 
> grease_quic_bit transport parameter. Is that meant as a failback kind 
> of thing? 


> If the new extension is not support I might be able to at 
> least grease? 

That's the idea.

> For me these things seems rather orthogonal. But if that 
> is meant as a fallback, it might be good to say that explicitly.