/sbin/iptables -t nat -N PORTFW
/sbin/iptables -t nat -A PREROUTING -j PORTFW
+ # upnp chain for our upnp daemon
+ /sbin/iptables -t nat -N UPNPFW
+ /sbin/iptables -t nat -A PREROUTING -j UPNPFW
+
# Custom mangle chain (for port fowarding)
/sbin/iptables -t mangle -N PORTFWMANGLE