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Re: [DNSOP] A conversational description of sentinel.

Geoff Huston <gih@apnic.net> Mon, 05 February 2018 19:18 UTC

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From: Geoff Huston <gih@apnic.net>
In-Reply-To: <alpine.DEB.2.11.1802051246230.30577@grey.csi.cam.ac.uk>
Date: Tue, 06 Feb 2018 06:18:07 +1100
Cc: Petr Špaček <petr.spacek@nic.cz>, dnsop@ietf.org
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To: Tony Finch <dot@dotat.at>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/dnsop/P8eLmTD52JWxSvLQfeqrdazuWSk>
Subject: Re: [DNSOP] A conversational description of sentinel.
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> On 5 Feb 2018, at 11:47 pm, Tony Finch <dot@dotat.at> wrote:
> 
> Geoff Huston <gih@apnic.net> wrote:
>> 
>> if not  underscores and IF “xm—“ as a leading substring is not acceptable for
>> some reason, then what label format would be acceptable for this
>> measure?
> 
> Maybe put the -- in the middle somewhere? e.g. is-ta--NNNN not-ta—NNNN
> 


I thought this was due to some concern over the wording in RFC <mumble>(some IDN
RFC whose number I can’t recall right now!) over a comment that the UC label 
should not contain the starting sequence "<letter> <letter> - -”

Is there a broader concern over the use of double hypens in labels in hostname
contexts in the DNS?

geoff

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