### BIG FAT DISCLAIMER
## The "-i $WAN" is used to match packets that come in via the $WAN interface.
## it WILL NOT MATCH packets sent from the $WAN ip address -- you won't be able
## to see the effects from within the LAN.

### Open port to WAN
## -- This allows port 22 to be answered by (dropbear on) the router
iptables -t nat -A prerouting_rule -i $WAN -p tcp --dport 22 -j ACCEPT
iptables        -A input_rule      -i $WAN -p tcp --dport 22 -j ACCEPT

### Port forwarding
## -- This forwards port 8080 on the WAN to port 80 on 192.168.1.2
iptables -t nat -A prerouting_rule -i $WAN -p tcp --dport  14883 -j DNAT --to 192.168.0.130:14883
iptables         -A forwarding_rule -i $WAN -p tcp --dport  14883 -d 192.168.0.130 -j ACCEPT

### DMZ
## -- Connections to ports not handled above will be forwarded to 192.168.1.2
#iptables -t nat -A prerouting_rule -i $WAN -j DNAT --to 192.168.0.130
#iptables        -A forwarding_rule -i $WAN -d 192.168.0.130 -j ACCEPT