Basic IP Block [bash]iptables -A INPUT -i eth0 -p tcp -s 1.1.1.1 -j DROP[/bash] Allow incoming SSH [bash]iptables -A INPUT -i eth0 -m state –state NEW,ESTABLISHED -m tcp -p tcp -s 1.1.1.1 –dport 22 -j ACCEPT[/bash] Allow incoming SSH from a Sepcific Network [bash]iptables -A INPUT -i eth0 -m state –state NEW,ESTABLISHED -m tcp […]