reverse resolution failing

[Mark Andrews]

In message <20130207184127.GA23546 at fantomas.sk>, Matus UHLAR - fantomas writes:
> >Jim Pazarena <bind at paz.bz> wrote:
> >>
> >> while it can resolve "webmail.acrodex.com" ( 139.142.184.10 )
> >> it cannot reverse resolve 139.142.184.10
> 
> On 07.02.13 17:51, Tony Finch wrote:
> >10.184.142.139.in-addr.arpa. CNAME 10.0-25.184.142.139.in-addr.arpa.
> >
> >0-25.184.142.139.in-addr.arpa. NS pluto.acrodex.com.
> >0-25.184.142.139.in-addr.arpa. NS nova.acrodex.com.
> >0-25.184.142.139.in-addr.arpa. NS saturn.acrodex.com.
> >
> >Nova does not exist.
> >
> >Pluto refuses most questions for 10.0-25.184.142.139.in-addr.arpa except
> >if you ask for a PTR, in which case it replies with a bogus question
> >section containing 139.0.184.142.in-addr.arpa.
> >
> >Saturn works OK for most questions, and returns a PTR record if you ask
> >for ANY, but if you request a PTR directly it ignores you.

It actually returns a response with a mismatching question section.
 
% dig 10.0-25.184.142.139.in-addr.arpa @saturn.acrodex.com +norec ptr
;; Question section mismatch: got 139.0.184.142.in-addr.arpa/PTR/IN
;; Question section mismatch: got 139.0.184.142.in-addr.arpa/PTR/IN
;; Question section mismatch: got 139.0.184.142.in-addr.arpa/PTR/IN

; <<>> DiG 9.10.0pre-alpha <<>> 10.0-25.184.142.139.in-addr.arpa @saturn.acrodex.com +norec ptr
;; global options: +cmd
;; connection timed out; no servers could be reached
% 

> some kind of lame DNS "load balancers"?

Looks like it.  Something which intecepts the PTR queries and forwards other
queries onto a full blown server.

Mark
 
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Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org