Question

First, the relevant xkcd comic: http://xkcd.com/979/

Next, the 10-year old thread on PerlMonks: http://www.perlmonks.org/?node_id=210422

Basically, I’m failing in my attempts to use Net::DNS::Update to create a PTR record and I’d like to see how others have manged this.

Below is what I’m trying. $hst is the hostname that I already have an A record for. $rev is the backwards IP address in-addr.arpa thingy.

# Create the update packet:
my $update = Net::DNS::Update->new($OURDOMAIN);

#  Add the PTR record:
$update->push(update => rr_add("$rev 3600 PTR $hst"));

# Send the update to the zone's primary master.
my $res = Net::DNS::Resolver->new;
$res->nameservers("$OURNMSERV");

Answer 1

If $OURDOMAIN is your main domain name, you need to know that you can’t put PTR records into your own domain, they have to be put in the right .in-addr.arpa zone.

That zone is most likely being run by your ISP, and they’re unlikely to support dynamic updates from end users.