CSF and LFD (Debian/Ubuntu) Basic Tutorial

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What's CSF (configserver firewall) ?
A Stateful Packet Inspection (SPI) firewall, Login/Intrusion Detection and Security application for Linux servers.

What's LFD (Login Failure Daemon) ?
It is a CSF add-on that scans the system logs for ips that are trying to access your server improperly.​