acl internal_networks { 127.0.0.0/8; 192.168.0.0/16; 172.16.0.0/12; 10.0.0.0/8; }; options { directory "/var/bind"; allow-recursion { internal_networks; }; listen-on { any; }; listen-on-v6 { none; }; pid-file "/var/run/named/named.pid"; allow-transfer { none; }; dnssec-enable yes; dnssec-validation yes; dnssec-lookaside auto; }; include "/etc/bind/bind.keys";