Before you begin to implement DNS Firewall in your BIND install it is recommended that you upgrade to the most recent version of BIND. We suggest that the upgrade be acquired directly from ISC (https:// www.isc.org/ downlaods/bind/) instead of updating from a software repository. This will safeguard against downloading an out of date version, as some repositories are not regularly updated. By taking these measures you will ensure that you have the best possible support for DNS Firewall.