US Robotics USR2410 Manual de usuario descargar pdf (Pagina 21)

2.8

Gentoo Linux

Gentoo is an operating system based on the open source Linux kernel. A unique feature of

Gentoo is the way that it distributes its software. Instead of precompiled binaries, Gentoo uses a

system called Portage that defines the dependencies of a particular software package, where to

download the source code and how to configure and build it locally on the machine. This allows

for the software to be customized for the particular hardware it is being run on. Another benefit

of Gentoo Linux is that its installation size is small, and only includes what is needed to boot the

machine and some basic system utilities. All other software must be acquired through Portage.

2.9

Linux Kernel Modules

A feature of the Linux kernel is its ability to load object files called kernel modules that contain

code to add features and functionality to the already running kernel. This increases the scalability

of the system, and when the kernel module is not needed any more it can be unloaded, freeing

system memory. This project deals with a number of kernel modules that will be discussed in the

relevant sections.

2.10

Click Modular Router

The Click Modular Router (Click) is a packet routing software package [5]. It allows the

configuration of a standard computer system into a fully functional router. Click defines what

happens to a packet when it arrives at a router. The packet must be processed before it leaves the

router in order to perform routing operations such as network address translation and to address

the packet using the protocol of the destination network. It also has the ability to classify a packet,

for example it can classify a packet by destination in order to determine which network the packet

should be output on. This is summarized in Figure 2-6, which shows a directed graph of the flow

of a packet through a Click router.

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US Robotics USR2410 Manual de usuario Pagina 21