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

Joe Touch <touch@strayalpha.com> Fri, 12 July 2019 18:00 UTC

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Date: Fri, 12 Jul 2019 11:00:38 -0700
From: Joe Touch <touch@strayalpha.com>
To: Tom Herbert <tom@herbertland.com>
Cc: "Black, David" <David.Black@dell.com>, tsvwg <tsvwg@ietf.org>
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Subject: Re: [tsvwg] draft-ietf-udp-options issues from IETF 104
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On 2019-07-12 10:44, Tom Herbert wrote:

> On Fri, Jul 12, 2019 at 10:19 AM Joe Touch <touch@strayalpha.com> wrote: 
> 
>> On 2019-07-12 09:40, Tom Herbert wrote:et the requirements (which
>> 
>> ... UDP options proposal
>> doesn't generally meet the requirements of RFC6936 for using UDPv6
>> zero checksum.
>> 
>> FRAG+LITE does, though - because it provides its own post-reassembly checksum.
> Unless the checksum covers the IP addresses, it doesn't meet the
> requirements

Given NATs rewriting those addresses, what's the point? 

> (not to mention as hard as I squint, I cannot fathom that
> UDP options is tunneling protocol). In any case, the requirments that
> UDPv6 checksum must be non-zero are baked in-- it's a done deal in the
> Internet. For instance, there's deployed middleboxes that will drop
> packets with UDP v6 zero checksum

"baked in" or not, it a bug according to the requirements as of RFC6936
- and it needs to be addressed. 

Joe

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