Related link: http://www.devguide.net/books/openbsdfw-01-ed/index.htm
I’m close to finishing my first book for O’Reilly. Yes, it is about firewalls. It is a continuation of BFWOAP2, which is a continuation of the original BFWOAP.
Someone suggested I should make BFWOAP2 available in PDF, which I’m a little reluctant to do. But another person suggested that a PDF version of BFWOAP might be a good teaser for those considering a purchase of BFWOAP2 or the O’Reilly book.
OK, you want it, you got it. It’s not free, but it is a PDF without DRM. What? No DRM? Yes, I trust you.