iptables-save > /tmp/iptables.sav iptables -F iptables -P INPUT DROP iptables -P OUTPUT DROP iptables -P FORWARD DROP iptables -A INPUT -i eth0 -p tcp --dport 22 -j ACCEPT iptables -A INPUT -i eth0 -p tcp --sport 22 -j ACCEPT iptables -A OUTPUT -p tcp --sport 22 -j ACCEPT iptables -A OUTPUT -p tcp --dport 22 -j ACCEPT iptables-restore < /tmp/iptables.sav