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This chapter is from the book



Firewall software is an important weapon in your security arsenal. It keeps the bad guys from using the Internet to break into your computer.

If you're running Mac OS X, you already have built-in firewall capabilities. The easiest way to turn the firewall on is to download a script called Brickhouse from It's $25 shareware. For other versions of Mac OS, I recommend Intego's NetBarrier ($60 from or Sustainable Softworks' IPNetSentry ($35 from


The Michelangelo virus activates tomorrow. This would be a good time to update your antivirus software (even though, as we'll learn tomorrow, Michelangelo isn't much of a threat any more).

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