Re: [DNSOP] CDS Bootstrapping for vanity DNS servers

Peter Thomassen <> Mon, 27 June 2022 17:40 UTC

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From: Peter Thomassen <>
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Subject: Re: [DNSOP] CDS Bootstrapping for vanity DNS servers
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Hi Rubens,

On 6/22/22 05:29, wrote:
>> On 22 Jun 2022, at 00:07, John Levine < <>> wrote:
>> In practice, I doubt that enough reverse zones are signed or that the
>> provisoning crudware that people use for reverse zones would work
>> often enough to be worth trying to do this. I did some surveys of
>> zones and found that in-bailiwick NS are quite uncommon, only a few
>> percent of the ones in large gTLDs.
> I don't expect the IP space used for DNS servers to be managed thru an IPAM system of sorts. But if one is used, it's unlikely they provision a zone-cut as required in the draft.
The draft does not require a zone cut anywhere; it's merely a (normative-language) recommendation. Quoting from Section 4.1:

     Signaling Domains SHOULD be delegated as zones of their own, so that
     the Signaling Zone's apex coincides with the Signaling Domain (such
     as  While it is permissible for the
     Signaling Domain to be contained in a Signaling Zone of fewer labels
     (such as, a zone cut ensures that bootstrapping
     activities do not require modifications of the zone containing the
     nameserver hostname.

Thinking about it, perhaps there's no reason for normative language here. If others agree, please let me know and I'll change to lowercase "should".