iptables -L -n
iptables -D INPUT 1
iptables -A INPUT -p all -s 192.168.1.203 -j DROP
iptables -A INPUT -p tcp -s 192.168.1.203 --dport 22 -j DROP
iptables-save > filename
iptables-restore < filename
iptables -L -n
iptables -D INPUT 1
iptables -A INPUT -p all -s 192.168.1.203 -j DROP
iptables -A INPUT -p tcp -s 192.168.1.203 --dport 22 -j DROP
iptables-save > filename
iptables-restore < filename