“In this article I will show how to install and configure
fail2ban on a Debian Etch system. Fail2ban is a tool that observes
login attempts to various services, e.g. SSH, FTP, SMTP, Apache,
etc., and if it finds failed login attempts again and again from
the same IP address or host, fail2ban stops further login attempts
from that IP address/host by blocking it with an iptables firewall
rule…”