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Chapter 2: System and Network Administration Overview
This is the Title of the Book, eMatter Edition
Copyright © 2006 O’Reilly & Associates, Inc. All rights reserved.
Countries also have their own two-letter top-level domains based on two-letter
country codes. For example, the Web server for the British Broadcasting System
(BBC) in the United Kingdom has the following domain name: www.bbc.co.uk.
Some domains (e.g., edu, gov, and mil) are sponsored by organizations that restrict
their use; others (e.g., com, info, net, and org) are unrestricted. One special
domain, arpa, is used for technical infrastructure purposes. The Internet Corpora-
tion for Assigned Names and Numbers (ICANN) oversees top-level domains and
provides contact information for sponsored domains.
Configuring TCP/IP
Certain commands are normally run in the system’s startup files to enable a
system to connect to a network. These commands can also be run interactively.
ifconfig
The network interface represents the way that the networking software uses the
hardware: the driver, the IP address, and so forth. To configure a network inter-
face, use the ifconfig command. With ifconfig, you can assign an address to a
network interface, setting the netmask, broadcast address, and IP address at boot
time. You can also set network interface parameters, including the use of ARP, the
use of driver-dependent debugging code, the use of one-packet ...