• sudo apt install fail2ban

  • sudo systemctl start fail2ban

  • sudo systemctl enable fail2ban

  • To check iptables rules added by fail2ban

    • iptables -L f2b-sshd -v -n –line-numbers

Reference:

  1. https://www.linode.com/docs/guides/using-fail2ban-to-secure-your-server-a-tutorial/