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Re: [tsvwg] New Version Notification for draft-touch-tsvwg-udp-options-05.txt

"C. M. Heard" <heard@pobox.com> Tue, 28 February 2017 23:06 UTC

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From: "C. M. Heard" <heard@pobox.com>
Date: Tue, 28 Feb 2017 15:06:15 -0800
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To: Joe Touch <touch@isi.edu>
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Cc: Mark Smith <markzzzsmith@gmail.com>, tsvwg <tsvwg@ietf.org>
Subject: Re: [tsvwg] New Version Notification for draft-touch-tsvwg-udp-options-05.txt
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On Tue, Feb 28, 2017 at 12:03 PM, Joe Touch <touch@isi.edu> wrote:
> On 2/28/2017 10:58 AM, C. M. Heard wrote:
>> If the Fragmentation option includes its own post-reassembly checksum,
>> then a Lite option could be inserted immediately following the UDP
>> header in each fragment, without loss of functionality. Implementations
>> that do not support UDP options would see UDP fragments so constructed
>> as empty UDP datagrams and would discard them, removing the danger of
>> accidental misinterpretation.
>
> Is see how that's useful, but it would also appear to mean we might be
> able to use LITE twice - once as this trick to hide fragments (which is
> elegant - thanks!), but also to allow the use of LITE in the final
> result. I'm not sure whether that makes sense yet, though - if you check
> to see that the whole thing is there, there's little point in allowing
> part of the packet to not be checksummed (it already would be).
>
> So maybe LITE couples with FRAG only in the way you mention, and no other?

That is exactly how I would envision it.

Thanks,

Mike Heard

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