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Configuring IPCop Firewalls by James Eaton-Lee, Barrie Dempster

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How Networks are Structured

Whether you know it or not, the chances are that any network that you use is build on top of IP, Internet Protocol. IP and the protocols that are built on top of it (such as TCP, UDP, and ICMP, all of which use IP datagrams) are the foundation of almost every network presently deployed. The components that such networks are built out of are interoperable, and for these reasons their roles are well defined and well understood. We will, briefly, talk about these devices and—particularly—how they interconnect with firewalls.

Ethernet, as the underlying technology on top of which most of these protocols are generally layered, forms the basis of these devices. As such network devices, peripherals, and appliances are often ...

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