iptables -F input_rule
iptables -F output_rule
iptables -F forwarding_rule
-iptables -F prerouting_rule
-iptables -F postrouting_rule
+iptables -t nat -F prerouting_rule
+iptables -t nat -F postrouting_rule
### BIG FAT DISCLAIMER
### The "-i $WAN" literally means packets that came in over the $WAN interface;