#FORWARD ON
sysctl -w net.ipv4.ip_forward=1
#SNAT
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
#DNAT
iptables -t nat -A PREROUTING -i eth0 -p tcp -dport 22 -j DNAT --to-destination 192.168.25.3
#SAVE FOREVER
iptables-save > /etc/sysconfig/iptables
echo "net.ipv4.ip_forward = 1" > /etc/sysctl.conf