iptables -X
iptables -F
iptables -P INPUT ACCEPT
iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A INPUT -p icmp -j ACCEPT
iptables -A INPUT -p gre -j ACCEPT
iptables -A INPUT -p tcp -m state --state NEW -m multiport --dport 80,25,110,143,22,1723 -j ACCEPT
iptables -A INPUT -i lo -j ACCEPT
iptables -A INPUT -j REJECT --reject-with icmp-host-prohibited
/etc/init.d/iptables save
service iptables restart
