Part II. Building Firewalls

This part of the book describes how to build firewalls. It discusses basic network concepts; explains firewall technologies, architectures, and design principles; and describes how packet filtering and proxying systems work. It also presents a general overview of the process of designing and building bastion hosts for firewall configurations, and discusses the specifics of building them in Unix, Linux, Windows NT, and Windows 2000 environments.


3.9. Security Through Obscurity		4. Packets and Protocols