Doing Stuff with FreeBSD, OpenBSD, NetBSD and MacOSX
Want to speed up your system a bit as well as reduce boot time and resource usage? Or compile extra features into your kernel? The best way to do that is to compile your own custom kernel yourself. It is much simpler than you would think, ESPECIALLY if you’ve ever tried it in Linux. 
The original guide is found at www.derrickl.net/guides.
The purpose of this guide is to provide the reader with enough knowledge to configure FreeBSD with a basic NAT/Firewall setup, allowing you to share your internet connection between all your computers with only one IP address, and to protect your network from hackers.
Security is one of the most important things in administrating any sort of computer system. FreeBSD is certainly much more secure than Windows and other popular computer systems; however, most security problems lie within the user and other running software on the system than the OS itself. This guide will give a few hints and examples to make it a fair bit harder to violate your system.