Reverse DNS in BIND 9.8
by Alpha01
I use BIND on my home network, and giving the bast amount of virtual machines I have online, I’ve always find myself wanting to easily look up which machine is using which IP address without having to ssh into the actual vm or check the zone file. Configuring reverse DNS in BIND 9.8 is actually a dead simple process.
First, a separate zone file for PTR records needs to be created, I named mine db.192.168.1.255.
Note: since my network address space is 192.168.1, the actual PTR record will be the network address backgrounds followed by in-addr.arpa..
$TTL 3h
@ IN SOA ns1.rubyninja.org. dnsadmin.rubysecurity.org. (
2013090701 ; serial
3h ; refresh after 3 hours
1h ; retry after 1 hour
1w ; expire after 1 week
1H ) ; negative caching TTL of 1 hour
IN NS ns1.rubyninja.org.
IN NS ns2.rubyninja.org.
14.1.168.192.in-addr.arpa. IN PTR email.rubyninja.org.
Lastly, the zone entry needs to be added to the master named.conf file. Mine looks like this
zone "1.168.192.in-addr.arpa" IN {
type master;
file "etc/zones/db.192.168.1.255";
allow-query { any; };
};
After reloading Bind, you verify reverse DNS works by using the utility of your choice; ie dig, host, nslookup, etc..
nslookup 192.168.1.14
Server: 192.168.1.10
Address: 192.168.1.10#53
14.1.168.192.in-addr.arpa name = email.rubyninja.org.
bind