Drop invalid packages iptables -I INPUT 1 -m conntrack –ctstate INVALID -j DROP Allow loopback interface connection iptables -A INPUT -i lo -j ACCEPT Allow input and output related and established rules iptables -A INPUT -m state –state RELATED,ESTABLISHED -j ACCEPTiptables -A OUTPUT -m state –state NEW,ESTABLISHED -j ACCEPT Allow SSH iptables -A INPUT -p…