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Re: [DNSOP] request for working group to adopt draft-gersch-dnsop-revdns-cidr-04.txt

Ray Bellis <Ray.Bellis@nominet.org.uk> Tue, 05 March 2013 12:11 UTC

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From: Ray Bellis <Ray.Bellis@nominet.org.uk>
To: Daniel Massey <massey@cs.colostate.edu>
Thread-Topic: [DNSOP] request for working group to adopt draft-gersch-dnsop-revdns-cidr-04.txt
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Date: Tue, 05 Mar 2013 12:11:01 +0000
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Subject: Re: [DNSOP] request for working group to adopt draft-gersch-dnsop-revdns-cidr-04.txt
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On 5 Mar 2013, at 01:24, Daniel Massey <massey@cs.colostate.edu> wrote:

> Hi,
> 
> We have an approach for naming IP prefixes and have been using the naming scheme for about a year now.       The scheme is documented at:
> 
> draft-gersch-dnsop-revdns-cidr-04.txt
> 
> Over the past several months,   we have incorporated feedback from users and also incorporated some past feedback from the working group.     We ask the community to take a look at the above draft and consider adopting the draft as a working group item.

I still find one aspect of this draft very troubling.

Having just written a script to test out the algorithm, I find that it still has the property that the generated prefix for "/M" is not a sub-prefix of that for "/N" if "M" is not within the same octet boundary as "N".

For example:

  m.82.129.in-addr.arpa (for 129.82.0.0/16)

is not a subdomain of

  1.0.0.1.0.1.0.m.129.in-addr.arpa (for 129.82.0.0/15).

What I can't tell from the draft is whether this fails Design Requirement 3:

"Coverage Authority: With the exception of data that has been sub-
 delegated to a child zone, the reverse DNS zone must be
 authoritative for all sub-prefixes below the covering prefix.
 Any query for a sub-prefix must be answered with a data record or
 NXDOMAIN specifying this zone as the authority."

I posted the exact same concerns to DNSOP last May and June but there were not addressed.

kind regards,

Ray

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