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ss_limit
2023 Mar 18
2
Minimize sshd log clutter/spam from unauthenticated connections
I guess you might find fail2ban useful.
It scans logfiles (like /var/log/sshd.log), and when it sees too many authentication failures from an IP address (or network range) it can issue commands to drop any further attempts via a firewall.
By having it read its own logfile it's possible to have repeated offenders be cut out for longer and longer time spans.