Host firewalls, router firewalls, and Windows built-in firewall are great for stopping most exploits but the fact remains, if the bad guy wants in and they are proficient (and patient) enough, they will break down the door. Having a Intrusion … The IDS that I chose for my host was OSSEC, an open source host -based Intrusion Detection System offered by Trend Micro
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Installing an Intrusion Detection System (IDS) and Reporting Interface
