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

Tom Herbert <tom@herbertland.com> Fri, 19 July 2019 02:02 UTC

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From: Tom Herbert <tom@herbertland.com>
Date: Thu, 18 Jul 2019 19:02:10 -0700
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To: Joe Touch <touch@strayalpha.com>
Cc: Gorry Fairhurst <gorry@erg.abdn.ac.uk>, tsvwg <tsvwg@ietf.org>
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Subject: Re: [tsvwg] draft-ietf-udp-options issues from IETF 104
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On Thu, Jul 18, 2019 at 6:30 PM Joe Touch <touch@strayalpha.com> wrote:
>
>
>
> On Jul 18, 2019, at 11:18 AM, Tom Herbert <tom@herbertland.com> wrote:
>
> The receiver already ignores unknown options.
>
>
> I believe that's the problem. There some options that cannot be
> ignored and still maintain correctness. This is already a known issue
> with other protocols.
>
>
> Right, but this is UDP. There are inherent limits to what we can do here.
>
IPv6 has HBH and dest options as TLVs. IPv6 allows unrecognized
options. IPv6 has bits in the option type that tell receiver whether
to drop packet if option is unknown. IPv6 is stateless and doesn't
define any negotiation. The solution in IPv6 provides correctness for
options that cannot safely be ingnored. Please explain EXACTLY why UDP
options cannot use this same technique.

Tom

> Joe

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