IPTables
To List: sudo iptables -L -v -n To Add: sudo iptables -A INPUT -p tcp -s 200.200.200.200 --dport 1433 -j ACCEPT To Delete: sudo iptables -L INPUT --line-numbers sudo iptables -D INPUT 5 To Save: sudo iptables-save > /etc/iptables/rules.v4 However I was getting permissions error try to save: sudo bash -c "iptables-save > /etc/iptables/rules.v4" Did the job