help wiht classless network and reverse lookups

Mark.Andrews at nominum.com Mark.Andrews at nominum.com
Tue Mar 20 20:40:19 UTC 2001


> 
> Hi,
> 
> I've been through the archive and I'm a little confused
> about classless subnetting and reverse name lookups.
> I believe I have my configuration setup correctly, but
> from what I have read in the archives, it seems to say
> that this should work for my internal network even if
> my ISP has not set their reverse zones up as per RFC2317...
> So, I am unclear if I have a problem in my configuration or
> if my ISP is not setup correctly and my server is referencing
> their servers and it isn't working because of that.  The
> relevent bits are...
> 
> named.conf contains
> 
> zone "0-26.235.243.193.in-addr.arpa"{
>         type master;
>         file "193.243.235";
> };

	I would call the file "193.243.235.0-26", you will want
	"193.243.235" for the 235.243.193.in-addr.arpa zone.

> 
> 193.243.235 contains
> 
> $ORIGIN 0-26.235.243.193.in-addr.arpa.
> @    IN SOA     ns0.terrapin.co.uk.     postmaster.bill.co.uk. (....)
> ...
> @                       NS      ns0.terrapin.co.uk.
> @                       NS      ns0.emtex.com.
> 3                       IN      PTR     lucida.terrapin.co.uk.

	looks reasonable, however you should post the whole master
	file.

> 
> which I think is correct yet I can't get any reverse info,
> in fact when I start nslookup pointed at 193.243.235.3,
> it fails saying it can't find the name of the server.

	Use dig, nslookup is querky.

>  When
> I explicity point it at 193.243.235.3 again and do a host.domain
> lookup, it responds fine.... So, is the problem with my ISP
> or am I guilty of a typo somewhere (that I haven't been
> able to see for 10 hours????)
> The only other info I have at the moment is my My log files are telling
> me that
> 
> named[4278]: Lame server on '3.235.243.193.in-addr.arpa' (in
> '235.243.193.in-addr.arpa'?): [193.243.233.9].53 'ns1.cerbernet.co.uk'
> 
> ns1.cerbernet.co.uk is my ISPs name server....

	Well you are not going to succeed until the parent zone is setup.
	You should also be a slave of this zone as you will need it when
	you are disconnected from the net.

	Mark
> 
> and then I get a
> 
> named[4278]: ns_forw: query(10.235.243.193.in-addr.arpa) All possible A
> RR's lame
> 
> and I haven't been able to figure out exactly what these
> are trying to tell me.
> 
> I'd sure appreciate if someone could clear this up for me as
> I can't seem to make any further headway.
> 
> 
> Thanks,
> 
> Bill
> 
> 
--
Mark Andrews, Nominum Inc.
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark.Andrews at nominum.com


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