Fail2ban is an intrusion prevention tool that protects computers from brute force and other attacks by closely monitoring the log files. The tool would then ban the suspicious IP addresses based on the predefined number of failed login attempts to stop the attacks. Fail2Ban uses jails to monitor log files for authentication failures and other entries that can be considered suspicious activities.
It can be configured to send an email and/or ban the attacker’s IP address for a pre-defined length of time. After the ban period is over, the attacking IP address will be automatically unbanned. In this tutorial, we will show you how to install and configure Fail2ban on Ubuntu 22.04.