INTERNET FIREWALLS AND NETWORK SECURITY, SECOND EDITION
INTERNET FIREWALLS AND NETWORK SECURITY, SECOND EDITION is designed for system administrators and interested users who realize the risks involved in connecting a computer system to the Internet.
In days of old, brick walls were built between buildings in apartment complexes so that if a fire broke out, it would not spread from one building to another. Quite naturally, the walls were called “firewalls.”
When you connect your LAN to the Internet, you are enabling your users to reach and communicate with the outside world. At the same time, however, you are enabling the outside world to reach and interact with your LAN. Firewalls, in their barest sense, are routers through which the data traffic flows. If intruders attempt unauthorized access to your network, you stop them at the firewall and do not allow them any further into the system.
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