RFC 2317 reverse DNS - have I done it right?
Barry Margolin
barmar at alum.mit.edu
Thu Feb 12 18:30:20 UTC 2004
In article <c0gf0p$233d$1 at sf1.isc.org>, peter at pandasys.co.uk (peter)
wrote:
> Finally found an ISP who knows how to do this, and set it up, but I'm
> confused with the result from DNSStuf.com below (IP range is
> 81.187.228.192/27)...
>
> 81.187.228.192 - BOGUS [success=1 timeout=0 rcode=0 ancount=2
> type=CNAME] (192.228.187.81.in-addr.arpa)
> 81.187.228.193 - BOGUS [success=1 timeout=0 rcode=0 ancount=2
> type=CNAME] (193.228.187.81.in-addr.arpa)
> 81.187.228.194 - BOGUS [success=1 timeout=0 rcode=0 ancount=2
> type=CNAME] (194.228.187.81.in-addr.arpa)
> 81.187.228.195 - BOGUS [success=1 timeout=0 rcode=0 ancount=2
> type=CNAME] (195.228.187.81.in-addr.arpa)
> 81.187.228.196 - BOGUS [success=1 timeout=0 rcode=0 ancount=2
> type=CNAME] (196.228.187.81.in-addr.arpa)
> 81.187.228.197 - PTR record does not exist
> 81.187.228.198 - PTR record does not exist
> 81.187.228.199 - PTR record does not exist
> 81.187.228.200 - BOGUS [success=1 timeout=0 rcode=0 ancount=2
> type=CNAME] (200.228.187.81.in-addr.arpa)
> 81.187.228.201 - BOGUS [success=1 timeout=0 rcode=0 ancount=2
> type=CNAME] (201.228.187.81.in-addr.arpa)
> 81.187.228.202 - BOGUS [success=1 timeout=0 rcode=0 ancount=2
> type=CNAME] (202.228.187.81.in-addr.arpa)
> 81.187.228.203 - PTR record does not exist
> etc
>
> I was expecting to see the machine names at the addresses wit hthe
> BOGUS lines.
Looks like dnsstuff.com doesn't understand RFC 2317. It's probably
performing an ANY query instead of a PTR query. Or it's querying the
parent domain server with Recursion Desired disabled; it expects to get
either a PTR record or a referral, but it's getting a CNAME record
instead.
I suggest you complain to the maintainer of dnsstuff.com. Your BIND
configuration looks fine to me.
--
Barry Margolin, barmar at alum.mit.edu
Arlington, MA
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