Re: [tcpm] [Editorial Errata Reported] RFC7323 (6798)

Yaakov Stein <yaakovjstein@gmail.com> Mon, 27 December 2021 07:34 UTC

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From: Yaakov Stein <yaakovjstein@gmail.com>
Date: Mon, 27 Dec 2021 09:34:06 +0200
Message-ID: <CAE8H3+A7eFxHD5E2on2Cf=U78so8Bb-V7ayBoDo-zuUKXuVdbA@mail.gmail.com>
To: Carsten Bormann <cabo@tzi.org>
Cc: t petch <ietfa@btconnect.com>, RFC Errata System <rfc-editor@rfc-editor.org>, rs@netapp.com, tcpm@ietf.org, braden@isi.edu, Van Jacobson <vanj@google.com>, david.borman@quantum.com
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Subject: Re: [tcpm] [Editorial Errata Reported] RFC7323 (6798)
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None of the three cases I called out will cause interop problems, but they
open potential security or privacy issues.

But the lack of interop concerns did not dictate capitalization in other
cases, such as

  A TSecr value received in a segment MAY be used to update
  the averaged RTT measurement

which is a purely local matter.


Y(J)S


On Mon, Dec 27, 2021 at 8:08 AM Carsten Bormann <cabo@tzi.org> wrote:

> > On 2021-12-27, at 06:16, Yaakov Stein <yaakovjstein@gmail.com> wrote:
> >
> > In any case, the same RFC uses the normative "MAY" in several other
> places,
> > so these are probably mistakes.
> >
> > For example,
> >   The three-byte Window Scale option MAY be sent in a <SYN> segment by a
> TCP.
> > and
> >   This option MAY be sent in an initial <SYN> segment.
> >
> > So why
> >   A random offset may be added to the timestamp clock on a
> per-connection basis.
> > ?
> > Is this may to be considered weaker than the other two?
>
> Is this an interoperability “MAY”, i.e., does the peer need to be prepared
> for this behavior?  The other two clearly are, while this seems like local
> matter.
>
> Grüße, Carsten
>
>
>