Alterar:
# port forwarding to local machine
iptables -t nat -A PREROUTING -i $WAN -p tcp --dport 80 -j DNAT --to 192.168.1.96
Para:
# port forwarding to local machine
iptables -t nat -A PREROUTING -i $WAN -p tcp --dport 80 -j DNAT \
--to-destination 192.168.1.96:80