#create new TABLE  and FLUSH
iptables -N OPENDNSONLY 
iptables -F OPENDNSONLY 

#ALLOW OPENDNS IPZ for UDP and TCP on port 54
iptables -A OPENDNSONLY -p UDP --dport 53 -d 208.67.222.222 -j ACCEPT
iptables -A OPENDNSONLY -p UDP --dport 53 -d 208.67.222.222 -j ACCEPT
iptables -A OPENDNSONLY -p TCP --dport 53 -d 208.67.220.220 -j ACCEPT
iptables -A OPENDNSONLY -p TCP --dport 53 -d 208.67.220.220 -j ACCEPT

#DROP anythign else
iptables -A OPENDNSONLY -p TCP --dport 53 -j DROP
iptables -A OPENDNSONLY -p UDP --dport 53 -j DROP

#erase rule if already exists and re-add at begining
iptables -D FORWARD -j OPENDNSONLY
iptables -I FORWARD -j OPENDNSONLY