Denied Query

Mark_Andrews at Mark_Andrews at
Thu Jan 30 23:49:21 UTC 2003

> On 30 Jan 2003 04:09:17 -0000, Fred Viles
> <fv+abuse at> wrote:
> >Kevin Darcy <kcd at> wrote in news:b0kb5h$2728$1
> >
> >
> >>...
> >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...)

	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

	The answers to inverse queries were built up by the server
	when it loaded zones and when it cached answers.

Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark.Andrews at

More information about the bind-users mailing list