This is a book about building the network you need. In order to build that network, we’ll dip into the topics of firewalls and related functions, starting from a little theory along with a number of examples of filtering and other network traffic directing. We’ll assume that you have a basic to intermediate command of TCP/IP networking concepts and Unix administration.
All the information in this book comes with a fair warning: As in any number of other endeavors, the things we discuss can be done in more than one way. You should also be aware that, as with any other book about software, the world could have changed slightly or quite a bit since the book was printed. The information in the book is as up to date and correct as we could manage at the time of writing and refers to OpenBSD version 4.2, FreeBSD 7.0,and NetBSD 4.0, with any patches available shortly before the end of September 2007.
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