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There are probably a number of ways to do that. I personally use the software package "CSF/LFD" (ConfigServer Security and Firewall /Login Failure Daemon) for that, which among lots of other things, can download a number of IP blacklists and configure iptables to block them. By default it supports DSHIELD and the Spamhaus DROP list, but I think you can configure custom lists too. CSF includes a Webmin module to that you can access its configuration GUI from within Webmin.
There are probably a number of ways to do that. I personally use the software package "CSF/LFD" (ConfigServer Security and Firewall /Login Failure Daemon) for that, which among lots of other things, can download a number of IP blacklists and configure iptables to block them. By default it supports DSHIELD and the Spamhaus DROP list, but I think you can configure custom lists too. CSF includes a Webmin module to that you can access its configuration GUI from within Webmin.
Thanks, this was really helpful, great software, easy to install an setup