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Re: Non-Last Small IPv6 Fragments

Tim Chown <Tim.Chown@jisc.ac.uk> Wed, 16 January 2019 17:25 UTC

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From: Tim Chown <Tim.Chown@jisc.ac.uk>
To: Fred Baker <fredbaker.ietf@gmail.com>
CC: Fernando Gont <fgont@si6networks.com>, Bob Hinden <bob.hinden@gmail.com>, Fernando Gont <fernando@gont.com.ar>, "ek@loon.co" <ek@loon.co>, IPv6 List <ipv6@ietf.org>
Subject: Re: Non-Last Small IPv6 Fragments
Thread-Topic: Non-Last Small IPv6 Fragments
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Date: Wed, 16 Jan 2019 17:24:52 +0000
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> On 16 Jan 2019, at 17:20, Fred Baker <fredbaker.ietf@gmail.com> wrote:
> 
>> On Jan 15, 2019, at 11:42 PM, Fernando Gont <fgont@si6networks.com> wrote:
>> 
>> On 15/1/19 21:31, Warren Kumari wrote:
>> 
>>>> [Silly Idea #2]
>>>> Separate, even sillier idea: everyone converges on using 16 bits of
>>>> the flow ID to encode the lowest MTU encountered along the path.  Here
>>>> again, TCP MSS clamping style behaviour would be applied to this
>>> 
>>> 
>>> https://media.giphy.com/media/3o6ZthnDqxfAOFIhdC/giphy.gif
>>> Because there are deployed systems already, I don't think that this can
>>> be deployed **and fully relied upon**, but Ido think that it might
>>> actually be really useful. If the first 2 bits of the flow label are
>>> '11' or '10' or something, then it could mean that the next N (13?) bits
>> 
>> Next question is: This of course implies that, since using this would
>> make the FL take a few deterministic values, it cannot be used for e.g.
>> ECMP. Hence processing the EH chain becomes a requirement (well, in
>> practice it already is).
> 
> If you want to monkey with the Flow Label, I'd suggest you get Brian Carpenter into the conversation.

I believe he already said "Aaaargh!" :)

Tim

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