While poking around in my logs folder i came across a large auth.log file. I opened it and found ALOT of entries of random username attempts to access ssh on my POGO V2. I dont see where they gained access but this has me worrying. How can stop this? I tried fail2ban and kept getting errors when starting it and the same with SSHGUARD that i beleive was related to the errors with iptables i was getting. I only really need to access SSH locally, so would it be best to some how block SSH to allow only local IP's or is there a better way?
I know that strong passwords are the best way to prevent this but wanted to know what else i can do