Open recursive resolver fix

Open recursive resolver running on your server is a vulnerability to DNS Amplification attacks and should be fixed.

Easiest way to find out if you have it: http://openresolver.com/

How to fix:

Open the file /etc/named.conf and disable recursion:

options {
 recursion no;
 additional-from-cache no;
 };

Restart named:

/etc/init.d/named restart