On 5 April 2013 22:30, SebA <spah at syntec.co.uk> wrote:

** I wonder if it could be related to the fact that DiG needs to be invoked with -x for PTR checks.

Not required for PTR checks.

A quick look at the DiG man page suggests you could use either:

dig -t PTR my.ip.ad.dr.ess

Or:

dig my.ip.ad.dr.ess PTR

No, it's more like this:

dig ess.addr.ip.my.in-addr.arpa PTR

However, this is not the case. A closer looks reveals you have to use:

dig -x my.ip.ad.dr.ess

The -x option is a convenience, and it means not only "set type to PTR" but also "reverse octets and append 'in-addr.arpa'".

I'm not in a position to check until tomorrow, but I'm confident that I successfully test for the localhost address like so

DNS=PTR:1.0.0.127.in-addr.arpa

J