Found a outstanding article on setting up Chkrootkit, Portsentry, and Logcheck. Chkrootkit is a popular root kit checker (a tool for gaining root access to system.) Portsentry watches unused ports for inappropriate activity, and Logcheck monitors your logs looking for suspicious activity. For those of you not familiar with *nix OSes, these are common tools to protect your system for specific focused attacks. Because *nix doesn’t generally get viruses their is generally not a need for anti-virus software; but that doesn’t mean that there aren’t a great number of tools for protecting your system.