The thing about fail2ban is that it’s only affective against automated scans and script kiddies, and if you keep things updated and configured correctly then they aren’t a threat. Any adversary that can break encryption or exploit a zero day can also get around fail2ban.
Port knocking or gtfo
Fr tho why does no one do port knocking? I know its not a comprehensive solution but it’s a pretty cool component imo.
Port knocking is cool, but tunneling everything through ssh or a VPN (with strong keys, not passwords) is more secure.
If you set it up wrong or the service fails to start; you’ll need to use a console to recover.
Most people don’t even know about serial console servers
https://www.jpaul.me/2019/01/how-to-build-a-raspberry-pi-serial-console-server-with-ser2net/
