Iptables

• iptables -n -L -v -t nat -
• iptables -n -L -v -t filter -

echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A PREROUTING -i ethX -p tcp --dport 21 -j DNAT --to-destination WIN_IP:3389
iptables -t nat -A POSTROUTING -o ethX -j MASQUERADE