iptables redirecionamento de porta

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

sysctl net.ipv4.ip_forward=1

iptables -t nat -A PREROUTING -p tcp --dport 1111 -j DNAT --to-destination 2.2.2.2:1111

iptables -t nat -A POSTROUTING -j MASQUERADE