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Re: [tsvwg] draft-ietf-udp-options issues from IETF 104

"C. M. Heard" <heard@pobox.com> Sun, 21 July 2019 00:51 UTC

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From: "C. M. Heard" <heard@pobox.com>
Date: Sat, 20 Jul 2019 17:51:16 -0700
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To: Derek Fawcus <dfawcus+lists-tsvwg@employees.org>
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Subject: Re: [tsvwg] draft-ietf-udp-options issues from IETF 104
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On Sat, Jul 20, 2019 at 2:56 PM Derek Fawcus wrote:
> I suspect we should interpret "drop the packet" here for options marked
> as "drop if not known" to actually mean "discard the surplus".
>
> i.e. if a non-legacy receiver in processing the surplus finds such an
> option, it then switches to operating in legacy mode for that packet.

I do not agree.

> Which means that like the legacy receiver, it will either see a zero length
> UDP packet (if UDP payload length was zero) or see whatever legacy UDP data
> was passed in the non-surplus area.

What I was actually advocating was that in the presence of any option marked
"drop if unknown" there MUST NOT be any legacy data, i.e, such options
could not appear in the trailer format. All payload would have to be in the
surplus area (which requires the header format). In that case, "drop the
packet" and "drop the surplus" would amount to the same thing.

Mike

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