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

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

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From: Joe Touch <touch@strayalpha.com>
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Date: Fri, 12 Jul 2019 11:12:07 -0700
Cc: "Black, David" <David.Black@dell.com>, 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 12, 2019, at 11:07 AM, Tom Herbert <tom@herbertland.com> wrote:
> 
>> On Fri, Jul 12, 2019 at 11:00 AM Joe Touch <touch@strayalpha.com> wrote:
>> 
>> 
>> 
>> 
>> 
>> 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.
>> 
> 
> What is the bug?

Intermediate devices Dropping UDP packets with zero checksums. 

The have no idea what’s inside or whether is is a valid tunneling protocol. 

Ps - UDP is used for tunnels because it traverses NATs (or should) and doesn’t delay, unnecessarily reorder, or layer congestion control the way a TCP tunnel would. 

Joe

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