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Introducing Local Area Networks
The invention of Linux revolutionized computer networking. Creating a LAN before Linux existed was complicated and expensive. LANs were the nearly exclusive domain of big corporations, universities, and other monstrous organizations.Technical StuffBut the TCP/IP networking protocols were built into Linux from the beginning. In the mid-1990s, if you could afford a couple of PCs, a cheap piece of coaxial cable, and a few 10 Mbps (megabits per second) or faster Ethernet adapters, a LAN was born. Ethernet adapters, also commonly known as network interface cards (NICs), cost about $150 at the time. Prices, fortunately, have crashed since then, falling to earth like Ziggy Stardust: A 100 Mbps NIC now costs as little as $15, and you can buy an 11 Mbps wireless NIC for less than $100.To get your Red Hat computer on a network, you have to configure only a handful of networking subsystems. Here are the tasks that need to be performed in order for your networking to work:
Load your wireless or Ethernet NIC kernel module. Red Hat Linux generally detects your hardware and loads the correct kernel modules.
Configure your network interface card (NIC).
Configure your domain name service (DNS), which converts Internet names into Internet Protocol (IP) addresses.
WarningWireless networking suffers from some security vulnerabilities. Consult the “Wireless network warning” sidebar, later in this chapter.Performing these steps is pretty heavy lifting. The load is eased considerably by using the graphical Network Configuration Utility system administration tool provided by Red Hat. Have fun!
