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

Joe Touch <touch@strayalpha.com> Fri, 19 July 2019 03:02 UTC

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From: Joe Touch <touch@strayalpha.com>
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Date: Thu, 18 Jul 2019 20:02:38 -0700
Cc: Gorry Fairhurst <gorry@erg.abdn.ac.uk>, tsvwg <tsvwg@ietf.org>
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To: Tom Herbert <tom@herbertland.com>
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Subject: Re: [tsvwg] draft-ietf-udp-options issues from IETF 104
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> On Jul 18, 2019, at 7:02 PM, Tom Herbert <tom@herbertland.com> wrote:
> 
>> 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.

Again, because this is UDP.

IPv6 doesn’t need to deal with legacy receivers that ignore all options anyway - all the time.

So basically “drop if not supported” has no meaning ALREADY for legacy receivers. Anything further - deeper, or involving state - can still be performed by the receiver, at the receiver’s decision already anyway.

Joe

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