Re: [DNSOP] Creating a registry for reserved labels.

Geoff Huston <gih@apnic.net> Fri, 28 September 2018 18:03 UTC

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From: Geoff Huston <gih@apnic.net>
To: Paul Hoffman <paul.hoffman@icann.org>
CC: dnsop <dnsop@ietf.org>
Thread-Topic: [DNSOP] Creating a registry for reserved labels.
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Date: Fri, 28 Sep 2018 18:03:17 +0000
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Subject: Re: [DNSOP] Creating a registry for reserved labels.
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fwiw I agree with Warren’s proposal and Paul’s observation that such a registry is
a good idea and it need not reflect only left-most labels.

However, I worry that this approach does not generalise and scale well and the registry
maintenance guidelines should reflect an appropriately rigorous and conservative attitude to
further additions.

But its a useful registry to have in any case imho

Geoff




> On 28 Sep 2018, at 1:42 am, Paul Hoffman <paul.hoffman@icann.org>; wrote:
> 
> On 27 Sep 2018, at 8:13, Warren Kumari wrote:
> 
>> During the discussions on KSK Sentinel and MTA-STS (
>> https://datatracker.ietf.org/doc/draft-ietf-uta-mta-sts/20/) the IESG noted
>> that we recently have twice "reserved" use of a left hand (non-underscore)
>> label.
>> 
>> It is strongly felt that a registry to record names like this would be
>> useful.
>> 
>> Some examples of these names include:
>> root-key-sentinel-not-ta-<number>.
>> mta-sts.
>> xn--(anything).
> 
> xn--(anything) labels can appear anywhere.
> 
>> Ok, good point.... but, I still think that labels which get special
>> handling should be recorded *somewhere*, simply to satisfy the principle of
>> least astonishment...
> 
> Fully agree. However, the registry should probably be for "special handling", not just for left-most position.
>> 
>> So, does would anyone be willing to volunteer to write a "Special Use
>> Labels" document (similar to draft-ietf-dnsop-attrleaf) simply creating a
>> registry for "these left hand labels are special / funny in some way" ?
> 
> Sure.