Even with IP rotation, a proxy website would probably generate more traffic than normal from these few IPs, tweak fail2ban vars so you to make it less likely to trigger on false positives (larger number of requests / larger amount of time) but block the violating IPs for long period, few days for example.
Even with IP rotation, a proxy website would probably generate more traffic than normal from these few IPs, tweak fail2ban vars so you to make it less likely to trigger on false positives (larger number of requests / larger amount of time) but block the violating IPs for long period, few days for example.
I hope it helps