LINUX admin by Olaf Kirch, Terry Dawson

By Olaf Kirch, Terry Dawson

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To obtain a description of what the option is actually offering. You'll always have the option of yes (y) to statically include the component in the kernel, or no (n) to exclude the component completely. You'll also see the module (m) option for those components that may be compiled as a run-time loadable module. Modules need to be loaded before they can be used, and are useful for drivers of components that you use infrequently. The subsequent list of questions deal with networking support. The exact set of configuration options is in constant flux due to ongoing development.

Networking Interfaces To hide the diversity of equipment that may be used in a networking environment, TCP/IP defines an abstract interface through which the hardware is accessed. This interface offers a set of operations that is the same for all types of hardware and basically deals with sending and receiving packets. For each peripheral networking device, a corresponding interface has to be present in the kernel. For example, Ethernet interfaces in Linux are called by such names as eth0 and eth1; PPP (discussed in Chapter 8, The Pointto-Point Protocol) interfaces are named ppp0 and ppp1; and FDDI interfaces are given names like fddi0 and fddi1.

This address is different from the interface name mentioned previously; if you compare an interface to a door, the address is like the nameplate pinned on it. Other device parameters may be set, like the maximum size of datagrams that can be processed by a particular piece of hardware, which is referred to as Maximum Transfer Unit (MTU). Other attributes will be introduced later. Fortunately, most attributes have sensible defaults. IP Addresses As mentioned in Chapter 1, Introduction to Networking, the IP networking protocol understands addresses as 32bit numbers.

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