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Re: [tsvwg] Alternative version of the UDP FRAG option

Joe Touch <touch@strayalpha.com> Wed, 20 March 2019 14:58 UTC

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From: Joe Touch <touch@strayalpha.com>
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Date: Wed, 20 Mar 2019 07:58:45 -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] Alternative version of the UDP FRAG option
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> On Mar 20, 2019, at 7:34 AM, Tom Herbert <tom@herbertland.com> wrote:
> 
> On Wed, Mar 20, 2019 at 3:25 PM Joe Touch <touch@strayalpha.com> wrote:
>> 
>> 
>> 
>> On Mar 19, 2019, at 1:37 PM, Tom Herbert <tom@herbertland.com> wrote:
>> 
>> Gorry,
>> 
>> Suppose we create a compression option whereby UDP payload is compressed and decompressed at the receiver.
>> 
>> 
>> See the rules in Section 7 - which are there specifically to avoid this sort of tangle.
>> 
> From section 7:
> 
>>> At the sender, new options MUST NOT modify UDP packet content
>   anywhere except within their option field; areas that need to remain
>   unmodified include the IP header, IP options, the UDP body, the UDP
>   option area (i.e., other options), and the post-option area.
> 
> So that would seem to mean we'll never be able to add any interesting
> options like the payload compression I described.

Yes, but for a very specific reason.

If you do, you then have to decide on what content every other option would operate - pre-compression or post. I suspect you’d say pre, but if more than one option does that, you’re dead.

Joe

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