Also, those attackers usually control multiple ips, so even if you block several (or even several ip blocks), there is no guarantee you'll block them all. That seems like a very coarse solution to a very fine problem. Contrary to what others say, I am not a proponent of ip based blocking. I really recommend installing fail2ban, as it will rate-limit any user trying to log in based on their ip, that alone should filter out most of the malicious traffic. For example, I frequently see those "users" try to login: Those attacks are usually dictionary based attacks on common unix user names. (optional) Have you added a TOTP pam module for login?.(optional) Have you changed the SSH Port from 22 to something else?.(optional) Have you disabled password based login in favor of public key login?.Have you blocked the user www-data from ssh login?.I get several thousand of those each day, and I assume even that is minuscule compared to what large companies face.
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