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Re: Long Headers and Version Negotiation

Martin Thomson <martin.thomson@gmail.com> Mon, 08 January 2018 03:33 UTC

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From: Martin Thomson <martin.thomson@gmail.com>
Date: Mon, 08 Jan 2018 14:32:59 +1100
Message-ID: <CABkgnnUj2rz5t_6tcdoORAtaxZqNb6O3_onPWAoQDxHoRJuxVw@mail.gmail.com>
Subject: Re: Long Headers and Version Negotiation
To: Christian Huitema <huitema@huitema.net>
Cc: Martin Duke <martin.h.duke@gmail.com>, Nick Banks <nibanks@microsoft.com>, IETF QUIC WG <quic@ietf.org>
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On Mon, Jan 8, 2018 at 2:12 PM, Christian Huitema <huitema@huitema.net> wrote:
> About 0xFF invariant -- that was one of the issues we found during the
> December 18 interop. The first byte in the VN packet is unspecified so
> picoquic was setting it to 0xFF. Legit, but somewhat unexpected.

That's why we have these interop things.  The question is whether it
is surprising enough to warrant a change.

> Another point about VN storms. Servers can of course implement some kind of
> pacing. They should also only send VN in response to packets that are at
> least 1200 bytes, since CI must be at least that.

>From Section 7.1:

For servers, packets that aren’t associated with a connection
potentially create a new connection. However, only packets that use
the long packet header and that are at least the minimum size defined
for the protocol version can be initial packets.

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