[dns-wg] use of "rev-srv" attribute in "inetnum" (and "inet6num") objects

On Sun, Apr 01, 2007 at 03:37:56PM +0100, Leo Vegoda wrote:

> Do you know what percentage of rev-srv records are fully or partially  
> accurate?

I had hoped to be able to avoid this :-)
Seriously, that depends on what you consider accurate - or even 'partially
accurate'. Is it reality or what the domain: objects say? And is reality
what the delegation says or what the authoritative NS RRSet suggests?
Just one example: 1000 out of ~ 6000 name servers pointed at by rev-srv
attributes didn't even resolve. Whether that's good or bad depends on
what the quality of the domain: objects' nserver: attributes looks like.

For a match between rev-srv: and nserver: I've tried to get hold of those
address ranges greater or equal than /24, postulating /24 or /16 equivalent
in-addr.arpa domains where appropriate. The calculation is very rough since
/24s may be covered by /16s and sometimes there are domain: objects for
both the /16 and (some of) the lower /24s as well (which is confusing in and
of itself).
With all caveats, out of 38000 candidate domain: objects, only about 50%
were actually present.  Of those, approximately 2/3 had the same idea of the
NS RRSet as the inetnum: object. For those disagreeing, there might be overlaps
("partially accurate") or disjoint sets.

-Peter