Reverse DNS (PTR)
Shabam
blislecp at hotmail.com
Sun Aug 1 05:40:32 UTC 2004
I was informed by Aol that emails from my domain isn't reaching aol
subscribers because of the lack of PTR (reverse DNS). I did configure it in
my DNS server. When within the server and I type my site's IP address it
returns the domain name just fine. However when I'm doing a nslookup from
outside I get this:
---------------------------------------------
[root at somewhereelse]# nslookup 1.2.3.4
Note: nslookup is deprecated and may be removed from future releases.
Consider using the `dig' or `host' programs instead. Run nslookup with
the `-sil[ent]' option to prevent this message from appearing.
Server: 127.0.0.1
Address: 127.0.0.1#53
** server can't find 4.3.2.1.in-addr.arpa: NXDOMAIN
---------------------------------------------
Here's the output when doing the same within the DNS server that's delegated
to the domain name in question:
---------------------------------------------
[root at dnsserver]# nslookup 1.2.3.4
Answer crypto-validated by server:
Server: dnsserver.whatever.com
Address: 1.2.3.1
Answer crypto-validated by server:
Name: www.whatever.com
Address: 1.2.3.4
---------------------------------------------
How do I fix this problem so nslookup works from outside the box?
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