iptables

#!/bin/sh

echo 1 > /proc/sys/net/ipv4/ip_forward

iptables -F
iptables -t nat -F
iptables -X

iptables -t nat -A PREROUTING -p tcp --dport 25566 -j DNAT --to-destination 10.8.0.3:25565
iptables -t nat -A POSTROUTING -p tcp -d 10.8.0.3 --dport 25566 -j SNAT --to-source 10.0.0.11

#iptables -A INPUT -i eth0 -j ACCEPT
#iptables -A INPUT -i eth0 -m state --state ESTABLISHED,RELATED -j ACCEPT
#iptables -A OUTPUT -j ACCEPT

#iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE