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On 06/21/01 at 15:27, Andrew Schmiechen wrote:
Re: Reverse DNS
From: Global Homes Webmaster
Date: Thursday, June 21, 2001
Time: 3:12:52 pm
> Hello:
>
> I'm having some trouble getting reverse DNS to work with the subnet my ISP
> recently assigned. I'm hoping you can help.
>
> I have a network, 216.183.241.32/27. According to my ISP (Norlight),
> everything is set up correctly on their end so that we have control over
> reverse look ups.
>
> I have a zone set up in QDNS called 241.183.216.in-addr.arpa. When my DNS
> server is queried directly with an IP address (say 216.183.241.36), it
> responds correctly, however the rest of the internet can't resolve the IP.
>
> My ISP says that we need a zone named 32.241.183.216.in-addr.arpa. However,
> when queried directly, the server can't resolve the IP and neither can
> anyone else on the internet.
241.183.216.in-addr.arpa. is the name of the zone for the entire Class C, and
it's delegated to norlight.net. The norlight.net name servers delegate your
classless subnet to your name server, ns1.discovercolor.com, as the zone
32.241.183.216.in-addr.arpa., which is why your reverse zone should have that
name instead of 241.183.216.in-addr.arpa. Your ns1.discovercolor.com server
does have a 32.241.183.216.in-addr.arpa. zone that's got correct-looking SOA
and NS records. Now you need PTR records that look like:
33.32.241.183.216.in-addr.arpa. 86400 PTR hostname33.discovercolor.com.
34.32.241.183.216.in-addr.arpa. 86400 PTR hostname34.discovercolor.com.
35.32.241.183.216.in-addr.arpa. 86400 PTR hostname35.discovercolor.com.
etc...
Note the extra '.32' subdomain, which corresponds to the name of the zone. You
can just enter the names as '33', '34', etc. and QDNS will add the zone name
for you, as with any other zone. Norlight maps the normal in-addr.arpa. names
(from their 241.183.216.in-addr.arpa. zone) to the names in your zone with
CNAMEs so that it all works properly:
33.241.183.216.in-addr.arpa. 86400 CNAME 33.32.241.183.216.in-addr.arpa.
> I do have this zone set up exactly like my previous reverse zone for a full
> class C. I just can't figure out why this isn't working.
Possibly because you've left the '.32' sub-domain out of your PTR names? If
that's it, then you're almost there... 8^)
Christopher Bort | cbort@globalhomes.com
Webmaster, Global Homes | webmaster@globalhomes.com
<http://www.globalhomes.com/> | PGP public key available on request
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