Chapter 1 1 Why Internet Firewalls? It is scarcely possible to enter a bookstore, read a magazine or a newspaper, or lis- ten to a news broadcast without seeing or hearing something about the Internet in some guise. It’s become so popular that no advertisement is complete without a reference to a web page. While nontechnical publications are obsessed with the Internet, the technical publications have moved on and are obsessed with secu- rity. It’s a logical progression; once the first excitement of having a superhighway in your neighborhood wears off, you’re bound to notice that not only does it let you travel, it lets a very large number of strangers show up where you are, and not all of them are people you would have invited. Both views are true: The Internet is a marvelous technological advance that pro- vides access to information, and the ability to publish information,
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