fail2ban software package provides ban hosts that cause multiple authentication errors, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install fail2ban
fail2ban is installed in your system.
Make ensure the fail2ban package were installed using the commands given below,
$ sudo dpkg-query -l | grep fail2ban *
You will get with fail2ban package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Network |
| Package | fail2ban |
| Version | 0.9.3-1 |
| Description | ban hosts that cause multiple authentication errors |
| Sub Section | Net |
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