====== fail2ban ======
===== Installation =====

<code>
sudo apt update
sudo apt install fail2ban
sudo systemctl enable fail2ban
sudo touch /etc/fail2ban/jail.local
</code>

Debian 11
<code>
sudo systemctl start fail2ban.service
sudo systemctl status fail2ban.service
</code>

Debian 12

<code>
sudo apt install python3-systemd
</code>

''sudo nano /etc/fail2ban/jail.conf''

<code>
[DEFAULT]
sshd_backend = systemd
</code>

<code>
sudo systemctl start fail2ban.service
sudo systemctl status fail2ban.service
</code>

===== Steuerung =====

<code>
sudo systemctl status fail2ban.service
sudo systemctl restart fail2ban.service
sudo fail2ban-client status sshd
sudo fail2ban-client set <jail-name> unbanip <ip>
sudo fail2ban-client set <jail-name> banip <ip>
</code>