Chapter 30. Enabling Firewalls
In a perfect world, you could connect your computer to the Internet and never have to worry about it being attacked. But this isn’t a perfect world. Chances are that criminals are scanning your computer for vulnerabilities right now. To protect your Mac, you need to monitor and control its network connections.
Your Mac’s network connection is a two-way street. When you use an application on your computer to find information on the Internet, it creates an outgoing connection to retrieve the data you’ve requested. Once the data is located, a server creates an incoming connection to deliver the information to your Mac. This ask-for-and-receive delivery method is the basis of all network connectivity.
The problem is that ...
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