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iptables

Information / How to block IPs with Brute Force Monitor in DirectAdmin using CSF Directadmin since version 1.39 has a built-in brute force monitor, which scan your service logs for any brute force login attempts on your system (dovecot, exim, proftpd, sshd) and sent... https://www.plugins-da.net/info/how-to-block-ips-with-csf-directadmin-bfm

Information / Protecting IP from hijacking from inside If you sell additional IPs to your users, so they could connect remote servers from your hosting server using their dedicated IP as a source IP, you might want (or even need) to protect it https://www.plugins-da.net/info/protecting-ip-from-hijacking-from