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Re: [AVTCORE] QUIC version 2 and RFC 7983bis

Lucas Pardue <lucaspardue.24.7@gmail.com> Wed, 11 May 2022 23:03 UTC

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From: Lucas Pardue <lucaspardue.24.7@gmail.com>
Date: Thu, 12 May 2022 00:03:00 +0100
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To: Bernard Aboba <bernard.aboba@gmail.com>
Cc: IETF AVTCore WG <avt@ietf.org>, Colin Perkins <csp@csperkins.org>
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Subject: Re: [AVTCORE] QUIC version 2 and RFC 7983bis
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Hi Bernard,

Thanks for sharing this analysis. It might also be worth mention
draft-ietf-quic-bit-grease [1], which allows endpoints that don't need to
worry about demux to change the "second-to-most significant bit of the
first byte in every QUIC packet". Not sure if you need a reference
(informally?) to the greasing draft draft. Interestingly,
draft-ietf-quic-bit-grease does reference RFC 7983; should it instead be
targeting 7983bis?

Cheers,
Lucas

[1] - https://datatracker.ietf.org/doc/html/draft-ietf-quic-bit-grease-02

On Wed, May 11, 2022 at 11:43 PM Bernard Aboba <bernard.aboba@gmail.com>
wrote:

> At IETF 113, we discussed checking the compatibility of RFC 7983bis and
> QUIC version 2 (https://datatracker.ietf.org/doc/html/draft-ietf-quic-v2)
>
> Looking through the QUIC v2 specification, it appears compatible with the
> multiplexing scheme described in RFC 7983bis, which focuses on the first
> octet of the packet. QUIC v2 modifies the version field which resides in
> the second through fifth octets of the long header, so that multiplexing is
> not affected. QUICv2 does not change the first octet ranges of the QUIC
> long header and short header so it remains compatible with the RFC
> 7983bis multiplexing scheme:
>
>                        +----------------+
>                        |        [0..3] -+--> forward to STUN
>                        |                |
>                        |      [16..19] -+--> forward to ZRTP
>                        |                |
>            packet -->  |      [20..63] -+--> forward to DTLS
>                        |                |
>                        |      [64..79] -+--> forward to TURN Channel
>                        |     [64..127] -+--> forward to QUIC
>                        |                |    (Short Header)
>                        |    [128..191] -+--> forward to RTP/RTCP
>                        |                |
>                        |    [192..255] -+--> forward to QUIC
>
>                        +----------------+ (Long Header)
>
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