Install on local drive

Start with installing it. 
sudo apt install fail2ban

Is it running?
systemctl status fail2ban

what is fail2ban doing right now?
sudo fail2ban-client status

Copy the config file in the OS
cd /etc/fail2ban
sudo cp jail.conf jail.conf.local
   Fail to ban will not overwrite the .local file and will also prefer to use it over the .conf

Edit config file
    - edit: `ignoreip =`  and IP address you always want to be allowed `192.168.1.103/24 192.168.1.129/24` or something like that.
    - `bantime =` keep this at 10 minutes

Ban or Unban an IP address
sudo fail2ban-client set sshd banip 192.168.1.1
sudo fail2ban-client set sshd unbanip 192.168.1.1