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Re: [tcpm] AccECN field order

Joseph Touch <touch@strayalpha.com> Wed, 27 January 2021 17:12 UTC

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From: Joseph Touch <touch@strayalpha.com>
In-Reply-To: <4AABAED3-4F64-47C6-9243-6864652765D0@eggert.org>
Date: Wed, 27 Jan 2021 09:12:30 -0800
Cc: tcpm IETF list <tcpm@ietf.org>, "Scheffenegger, Richard" <Richard.Scheffenegger@netapp.com>, Michael Tuexen <tuexen@fh-muenster.de>, Mirja Kühlewind <ietf@kuehlewind.net>, Vidhi Goel <vidhi_goel=40apple.com@dmarc.ietf.org>, tcpm-chairs@ietf.org
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To: Lars Eggert <lars@eggert.org>
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Subject: Re: [tcpm] AccECN field order
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> On Jan 26, 2021, at 11:44 PM, Lars Eggert <lars@eggert.org> wrote:
> 
> On 2021-1-27, at 6:21, Joseph Touch <touch@strayalpha.com> wrote:
>> On Jan 26, 2021, at 7:47 PM, Vidhi Goel <vidhi_goel=40apple.com@dmarc.ietf.org> wrote:
>>> 
>>> If the TCP option code points is not a scarce resource,
>> 
>> They are. Very much so.
> 
> https://www.iana.org/assignments/tcp-parameters/tcp-parameters.xhtml#tcp-parameters-1 shows ~200 out of 256 that are still reserved, i.e., available.

Granted, that’s just over 20%.

IP protocol numbers are one of the most scarce of popularly used codepoints, running over 50% assigned.

Transport ports are running somewhere around 12%, and we also treat them as a limited resource. So scarcity is relative. 

However, we’ve assigned 3 in the past 6 years (not counting this), and nearly every time the request started by asking for more than . As you note, there isn’t any risk of running out because we also recognize that every assignment becomes a potential argument for precedence for future assignments. This is why we treat them as scarce.

Joe

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