Denied Query
Mark_Andrews at isc.org
Mark_Andrews at isc.org
Thu Jan 30 23:49:21 UTC 2003
>
> On 30 Jan 2003 04:09:17 -0000, Fred Viles
> <fv+abuse at nospam.epitools.com> wrote:
>
> >Kevin Darcy <kcd at daimlerchrysler.com> wrote in news:b0kb5h$2728$1
> >@isrv4.isc.org:
> >
> >>...
> >As I understand it, "the rule" is that a nameserver is supposed to
> >be authoritative for its own PTR record, irrespective of whether
> >the corresponding zone is delegated to it or not. I don't recall
> >exactly where I read this "rule", but it was given without
> >explanation. Is the only reason to do this to make nslookup happy?
> >If so, what's the history behind this seeming chicken-and-egg case
> >(the rule only exists for compatibility with a tool that checks for
> >compliance with the rule...)
>
>
> BUTTSMOKE
>
Back when nslookup used inverse queries (not reverse queries
like it does today) the changes that a nameserver not being
able to answer that question was negligable provided it
implemented IQUERY.
The IQUERY was replaced with a reverse QUERY but the test
remained.
The answers to inverse queries were built up by the server
when it loaded zones and when it cached answers.
Mark
--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark.Andrews at isc.org
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