Re: [tcpm] draft-ietf-tcpm-accurate-ecn-09: AccECN option: why not EE1B first?

Joe Touch <touch@strayalpha.com> Fri, 15 November 2019 14:24 UTC

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From: Joe Touch <touch@strayalpha.com>
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Date: Fri, 15 Nov 2019 06:24:30 -0800
Cc: Neal Cardwell <ncardwell@google.com>, Bob Briscoe <ietf@bobbriscoe.net>, "tcpm@ietf.org" <tcpm@ietf.org>
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To: "Scheffenegger, Richard" <rs.ietf@gmx.at>
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Subject: Re: [tcpm] draft-ietf-tcpm-accurate-ecn-09: AccECN option: why not EE1B first?
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A better explanation would be important. Just not being “happy” and wanting “nice” doesn’t cut it.

The only justification for multiple code points for a single option would be the need to signals from both ends AT THE SAME TIME (I just went through this exercise for UDP options for PMTUD).

Joe

> On Nov 15, 2019, at 4:04 AM, Scheffenegger, Richard <rs.ietf@gmx.at> wrote:
> 
> I too like two different option numbers more than initial magic numbers
> - we aren't yet that constrained in the tcp options registry to not go
> that route...
> 
> Richard
> 
> 
> Am 14.11.2019 um 19:00 schrieb Neal Cardwell:
>> On Thu, Nov 14, 2019 at 12:47 PM Bob Briscoe <ietf@bobbriscoe.net> wrote:
>>> On 14/11/2019 10:06, Scheffenegger, Richard wrote:
>>>> Perhaps placing a different inital value in the first counter would
>>>> implicitly signal this better?
>>> I'll think about this - we can discuss at the hackathon.
>>> Another possibility would be to assign two option kind values for two
>>> different option orders - I think I prefer this.
>>> 
>>>> 
>>>> The folks from IPPM will not be all too happy with the semantics of
>>>> field values depening on some (possibly missed by passive observation)
>>>> initial value though...
>>> Well, true. But I don't think that's a show-stopper. Two option kind
>>> values would address this.
>> 
>> Two option kind values sounds like a nice solution, IMHO. Clear,
>> simple, and fast.
>> 
>> best,
>> neal
>> 
> 
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