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Re: Questions about Version Negotiation Concerning Possible Handshake Interruption

Martin Thomson <martin.thomson@gmail.com> Sat, 10 February 2018 08:56 UTC

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From: Martin Thomson <martin.thomson@gmail.com>
Date: Sat, 10 Feb 2018 19:56:42 +1100
Message-ID: <CABkgnnU5vA6Ypb9MnvQKDuvZvW1hTWt87_tH2uGSwGR48AaeaA@mail.gmail.com>
Subject: Re: Questions about Version Negotiation Concerning Possible Handshake Interruption
To: alexandre.ferrieux@orange.com
Cc: Christian Huitema <huitema@huitema.net>, Lingmo Zhu <zlm2006@gmail.com>, Mikkel Fahnøe Jørgensen <mikkelfj@gmail.com>, Kazuho Oku <kazuhooku@gmail.com>, "quic@ietf.org" <quic@ietf.org>
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On Sat, Feb 10, 2018 at 7:34 PM,  <alexandre.ferrieux@orange.com> wrote:
> Alternatively, what about a "no fallback" mode for sensitive applications
> like DNS ?

If versioning were strictly linear, you could do as we do for TLS and
remember that server X supported version Y and ignore any version
negotiation from X that claimed to support only Y-1.  That's not
necessarily an ideal outcome, but you can do that.

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