Linux Iptables Block Ip
Linux iptables, quick, simple and effective way to block an ip address or subnet range.
Syntax for Linux iptables command to block or drop an ip address
iptables -A INPUT -s IP-ADDRESS -j DROP
Example for Linux iptables command to block and ip
# iptables -A INPUT -s 65.55.44.100 -j DROP
Example for Linux iptables command to block a port for a specific ip address
# iptables -A INPUT -s 65.55.44.100 -p tcp --destination-port 25 -j DROP
Example to remove or unblock and ip address from the iptables list
# iptables -D INPUT -s xx.xxx.xx.xx -j DROP
# iptables -D INPUT -s 65.55.44.100 -j DROP
Remember to safe your iptables!
# service iptables save