Introduction

Introduction

This is a book about building the network you need. We’ll dip into the topics of firewalls and related functions, starting from a little theory. You’ll see plenty of examples of filtering and other ways to direct network traffic. I’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 warning: As in many endeavors, the solutions we discuss can be done in more than one way. And, of course, the software world is always changing and the best way to do things may have changed since this book was printed. This book was tested with OpenBSD ...

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