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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.
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| 3.9. Security Through Obscurity |  | 4. Packets and Protocols |
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