iptables -A INPUT -p tcp --tcp-flags ALL NONE -j DROP iptables -A INPUT -p tcp ! --syn -m state --state NEW -j DROP iptables -A INPUT -p tcp --tcp-flags ALL ALL -j DROP iptables -A INPUT -i lo -j ACCEPT iptables -A INPUT -p icmp -j ACCEPT iptables -A INPUT -p tcp -m tcp --dport 22 -j ACCEPT iptables -I INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -P INPUT DROP iptables -P OUTPUT ACCEPT apt-get install iptables-persistent
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