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Where there are differences between CentOS 6 / RedHat and Debian / Ubuntu, this document will use the following convention.
Instructions specific to Red Hat /CentOS will be in RED.
Instructions specific to Debian / Ubuntu will be in BLUE.
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First, install your GNU/Linux distribution. With both CentOS / RedHat and Debian / Ubuntu, I do a basic installation with no extra stuff. That means no GNOME, KDE, "Server" packages, or anything else. Just a base installation is all that's necessary. This guide has been checked on Linux installs with minimal install which is indeed quite minimal, because of this you may see some packages being installed that you might normally assume to be installed.
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If you're running CentOS or any other Red Hat-derived distribution, be sure that SELinux is turned off, Permissive mode was tested and it worked well, just very nagging. So disabling . SELinux prevents Apache from running the audit_subnet.sh script which uses nmap as root. Disabling SELinux is a lot easier that wayeasiest.
General Settings
Before you start you should determine the following:
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