>After seeing the link to <http://www.dnsreport.com>www.dnsreport.com I
>decided to give it a run and found that I have a problem with reverse
>lookups. I can nslookup locally but not from the outside and I was
>wondering if any of you had any idea as to how I could resolve this issue.
>
>I'm not very good with DNS and I use MetaIP to administer it and I realize
>this may not be the right forum for this question and any help would be
>appreciated.
Here's how you can check out the reverse DNS entries (using 127.0.0.1 as an
example). The DNS lookup involved is a PTR lookup of the reverse of the IP
address, on the in-addr.arpa domain. In this case, that would be
1.0.0.127.in-addr.arpa.
nslookup
root
set type=ns
in-addr.arpa
This will give you a list of the nameservers for "in-addr.arpa". You can
pick one and use it:
server d.root-servers.net
set type=ns
1.0.0.127.in-addr.arpa
0.0.127.in-addr.arpa
0.127.in-addr.arpa
127.in-addr.arpa
One of the 4 lookups will return the authoritative name servers for the IP
address in question (none will be returned using 127.0.0.1, though, as that
is a loopback address). Then:
server ns.example.com [entering a server you found above]
set type=ptr
1.0.0.127.in-addr.arpa
Yes, it gets confusing -- reverse DNS entries are quite tricky to
understand, especially because they are usually set up on a different DNS
server than your domain name.
-Scott
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