!/bin/sh
#iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
#iptables -t filter -A FORWARD -i $192.168.0.3 -p tcp -m multiport --destination-port 21,20,53,110,80,25 -j ACCEPT
#iptables -t filter -A FORWARD -o $192.168.0.3 -p tcp -m state --state ESTABLISHED,RELATED -j ACCEPT
### COMPARTILHA CONEXAO ###
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
echo 1 > /proc/sys/net/ipv4/ip_forward
### LIBERA PORTAS ###
iptables -A INPUT -p tcp --destination-port 25 -j ACCEPT
iptables -A INPUT -p tcp --destination-port 110 -j ACCEPT
iptables -A INPUT -p tcp --destination-port 21 -j ACCEPT
iptables -A INPUT -p tcp --destination-port 20 -j ACCEPT
iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 25 -j DNAT --to-dest 192.168.0.2
iptables -A FORWARD -p tcp -i eth0 --dport 25 -d 192.168.0.2 -j ACCEPT
iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 110 -j DNAT --to-dest 192.168.0.2
iptables -A FORWARD -p tcp -i eth0 --dport 110 -d 192.168.0.2 -j ACCEPT