Counts externally accessed IP addresses via iptables or something similar

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I own a hosting company and I often face the situation where my clients using weak passwords end up being broken and at the same time my VPSs become the source of scans on other hosting companies.

I managed to block through Suricata the situation in which a client scans a certain IP address for several ports or several passwords for the SSH port.

What I fail to do is prevent a client from sending TCP or UDP packets to detect on a subnet /24 which IP addresses have port 22 or another specific port open.

I recently tried iptables using the "hashlimit" module but from what I've tested, hashlimit doesn't make the difference between accessing 3 times the same 4 IP addresses in the last x seconds and accessing 12 different IP addresses in the same time frame.

Any help is welcome.



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