Secure SSH and you won't have to worry about rogue login attempts, which happen to everyone. If it really bothers you then move it to another port where it will

Secure SSH and you won't have to worry about rogue login attempts, which happen to everyone. If it really bothers you then move it to another port where it will happen less. But install a new firewall management system? Sounds like it will definitely introduce more risks than the problems it solves, which for the SSH example isn't really a problem at all.