Your first line of defense against Internet bots, hacks and probes. Login-Shield is a small set of bash scripts that implements an iptables/ipset blocklist of known sources of hack activity. Works great as a compliment with/without fail2ban. Statistics have shown it blocks 90+% of most system probes and attacks on login ports.
Why do you think that https://github.com/fail2ban/fail2ban is a good alternative to Login-Shield