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Chapter 4. Configuring TCP/IP Networking
In this chapter, we walk you through all the necessary steps to set
up TCP/IP networking on your machine. Starting with the assignment of
IP addresses, we slowly work our way through the configuration of
TCP/IP network interfaces and introduce a few tools that come in
handy when hunting down network installation problems.Most of the tasks covered in this chapter will generally have to be
done only once. Afterward, you have to touch most configuration files
only when adding a new system to your network or reconfiguring your
system entirely. Some of the commands used to configure TCP/IP,
however, have to be executed each time the system is booted. This is
usually done by invoking them from the system
/etc/rc scripts.
Commonly, the network-specific
part of this procedure is contained in a script. The name of this
script varies in different Linux distributions. In many older Linux
distributions, it is known as rc.net or
rc.inet. Sometimes you will also see two scripts
named rc.inet1 and
rc.inet2; the former initializes the kernel part
of networking and the latter starts basic networking services and
applications. In modern distributions, the rc
files are structured in a more sophisticated arrangement; here you
may find scripts in the /etc/init.d/ (or
/etc/rc.d/init.d/) directory that create the
network devices and other rc files that run the
network application programs. This book's examples
are based on the latter arrangement.This chapter discusses parts of the script
that configure your network interfaces. After finishing this chapter,
you should have established a sequence of commands that properly
configure TCP/IP networking on your computer. You should then replace
any sample commands in the configuration scripts with your commands,
make sure the script is executed from the basic
rc script at startup time, and reboot your
machine. The networking rc scripts that come
along with your favorite Linux distribution should provide a solid
example from which to work.
