For those of you interested in blocking by country ipaddress, you can take a peek at iptables -m geoip --help For debian(ubuntu) users, sudo apt-get install xt

For those of you interested in blocking by country ipaddress, you can take a peek at iptables -m geoip --help For debian(ubuntu) users, sudo apt-get install xtables-addons-common , beforehand. Although ineffective against committed intruders, it can clean your firewall logs a bit.