Re: Robert Wilton's Discuss on draft-ietf-quic-invariants-12: (with DISCUSS)

[Lucas Pardue <[e-mail]>]

Hi Robert,

Thanks for the review. I've tracked your discuss comments as a new issue on
the QUIC WG GitHub Repo at https://github.com/quicwg/base-drafts/issues/4468

Cheers,
Lucas
On behalf of QUIC WG Chairs

On Mon, Jan 4, 2021 at 11:42 AM Robert Wilton via Datatracker <
[e-mail]> wrote:

> Robert Wilton has entered the following ballot position for
> draft-ietf-quic-invariants-12: Discuss
>
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> Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
> for more information about IESG DISCUSS and COMMENT positions.
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>
> The document, along with other ballot positions, can be found here:
> https://datatracker.ietf.org/doc/draft-ietf-quic-invariants/
>
>
>
> ----------------------------------------------------------------------
> DISCUSS:
> ----------------------------------------------------------------------
>
> Hi,
>
> A trivial discuss that should hopefully be easy to resolve, and it is
> plausible
> that the resolution may end up being in the QUIC transport document:
>
> In this document, the unused bits are defined as:
>
>                    Figure 4: Version Negotiation Packet
>
>    Only the most significant bit of the first byte of a Version
>    Negotiation packet has any defined value.  The remaining 7 bits,
>    labeled Unused, can be set to any value when sending and MUST be
>    ignored on receipt.
>
> In the QUIC transport document, they are defined as this:
>
>                    Figure 14: Version Negotiation Packet
>
>    The value in the Unused field is selected randomly by the server.
>    Clients MUST ignore the value of this field.  Servers SHOULD set the
>    most significant bit of this field (0x40) to 1 so that Version
>    Negotiation packets appear to have the Fixed Bit field.
>
> I would have expected that these two should be consistent as to whether the
> Fixed Bit SHOULD be set to 1 or not.  Given
> draft-thomson-quic-bit-grease-00,
> it might be better if the SHOULD is removed from QUIC transport, but I will
> defer to the experts here.
>
> Regards,
> Rob
>
>
>
>
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>