Faster way paste this on console /sbin/iptables -F && /sbin/iptables -A INPUT -p tcp –tcp-flags ALL NONE -j DROP && /sbin/iptables -A INPUT -p tcp ! –syn -m state –state NEW -j DROP && /sbin/iptables -A INPUT -p tcp –tcp-flags ALL ALL -j DROP && /sbin/iptables -I INPUT -p icmp -m icmp –icmp-type echo-request -j … Continue reading Set up iptables On Debian 8 Debian 9