[SOLVED] Reverse DNS entry

ZAMO · 10-19-2010, 12:11 PM

Hi All,

I have one of my mail address being blocked by a service provider , stating that , the IP from which it delivered does not have a reverse DNS entry . But it is configured with a PTR and A record and they are resolving .

What i found is that , the PTR and A record for the internal DNS record ie ., within the network and not for the public network . Will i make the same A/PTR record to be available in public as well? We have a bind server running and there are so many domains available in public using the same DNS server. Please suggest

Skaperen · 10-19-2010, 01:48 PM

If the IP address needs to be accessed from public (if your ISP is blocking it, apparently that is your need), then it needs to have the reverse DNS configured (in the reverse zone delegated by your ISP), and the hostname given on that reverse DNS needs to have that IP address as one of the addresses given.

Here is a real world example done right:

Code:

linux.org.		43200	IN	MX	10 mail.linux.org.
mail.linux.org.		43200	IN	A	198.182.196.60
60.196.182.198.in-addr.arpa. 43200 IN	PTR	mail.linux.org.

Note that this is the incoming mail being shown. If outgoing mail is on a different server, and comes out via a different IP address, then you need to make sure the PTR record for that IP is set up, and its hostname has an A record entry with that IP address.