iptables -t nat -A prerouting_rule -i $WAN -p udp --dport 4569 -j ACCEPT
iptables        -A input_rule      -i $WAN -p udp --dport 4569 -j ACCEPT

iptables -t nat -A prerouting_rule -i $WAN -p udp --dport 10000:32768 -j ACCEPT
iptables        -A input_rule      -i $WAN -p udp --dport 10000:32768 -j ACCEPT