$ sudo yum --y install fail2ban


$ sudo apt install fail2ban


$ sudo systemctl enable fail2ban
$ sudo systemctl start fail2ban


$ sudo cp /etc/fail2ban/jail.conf /etc/fail2ban/jail.local


ignoreip = 127.0.0.1/8


ignoreip = 127.0.0.1/8 192.168.1.55 192.168.1.89


$ sudo vi /etc/fail2ban/jail.d/sshd.local


$ sudo systemctl restart fail2ban


$ sudo fail2ban-client set sshd unbanip 192.168.1.96