Amazon.com just published my five star review of Absolute FreeBSD, 2nd Ed by Michael Lucas. Michael Lucas is probably the best system administration author I’ve read, reviewer says. Michael Rash’s book is exceptionally clear, organized, concise, and actionable. You should be able to read it and implement everything you find by following his examples. You will not only learn tools and techniques, but you will also appreciate Mike’s keen defensive insights. As a FreeBSD user, Linux Firewalls is good enough to make me consider using Linux in certain circumstances!”]
Source: https://taosecurity.blogspot.com/2007/12/two-book-reviews-posted.html