iptables -L -n  
iptables -F
iptables -X
iptables -F -t mangle
iptables -t mangle -X
iptables -F -t nat
iptables -t nat -X

iptables -A INPUT -p tcp --dport 22 -j ACCEPT  
iptables -A OUTPUT -p tcp --sport 22 -j ACCEPT  
iptables -A INPUT -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT  
iptables -A OUTPUT -p tcp --sport 80 -m state --state NEW,ESTABLISHED -j ACCEPT 
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT
iptables -A INPUT -i eth+ -p icmp --icmp-type 8 -j ACCEPT
iptables -A OUTPUT -o eth+ -p icmp --icmp-type 0 -j ACCEPT
iptables -P INPUT DROP  
iptables -P FORWARD ACCEPT  
iptables -P OUTPUT DROP  
service iptables save   
service iptables restart
iptables -L -n