Using 802.11 on Linux

When the first edition of this book was written, 802.11 was only just coming to Linux. Cards had to be selected carefully because very few cards were supported with full open source drivers that evolved at the same pace as the Linux kernel. Linux support has now moved into the mainstream, with many vendors actively sponsoring driver development projects, or at the very least supporting efforts to target their hardware. Broadcom is a notable exception.

Most 802.11 devices are supported by the PCMCIA system. As with Windows drivers, installing wireless cards on Linux creates Ethernet interfaces. Many Linux drivers expose an Ethernet interface through the kernel, and most drivers even name the resulting interfaces with the eth prefix. Programs can use the Ethernet interface to send and receive data at the link layer, and the driver handles Ethernet-to-802.11 conversions.[*] Many of the things you would expect to see with an Ethernet interface remain the same. ARP works identically, and the IP configuration is done with the same utilities provided by the operating-system distribution. ifconfig can even be used to monitor the interface status and see the data sent and received.

[*] There are two major encapsulation formats for data on 802.11. RFC 1042 is used for IP, and universally supported. Windows and MacOS support IPX and AppleTalk with 802.1H. Not all Linux drivers support 802.1H.

Introduction to Wireless Networking

Overview of 802.11 Networks

11 MAC Fundamentals

11 Framing in Detail

Wired Equivalent Privacy (WEP)

User Authentication with 802.1X

11i: Robust Security Networks, TKIP, and CCMP

Management Operations

Contention-Free Service with the PCF

Physical Layer Overview

The Frequency-Hopping (FH) PHY

The Direct Sequence PHYs: DSSS and HR/DSSS (802.11b)

11a and 802.11j: 5-GHz OFDM PHY

11g: The Extended-Rate PHY (ERP)

A Peek Ahead at 802.11n: MIMO-OFDM

11 Hardware

Using 802.11 on Windows

11 on the Macintosh

Using 802.11 on Linux

Using 802.11 Access Points

Logical Wireless Network Architecture

Security Architecture

Site Planning and Project Management

11 Network Analysis

11 Performance Tuning

Conclusions and Predictions

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802.11 Wireless Networks The Definitive Guide
802.11 Wireless Networks: The Definitive Guide, Second Edition
ISBN: 0596100523
EAN: 2147483647
Year: 2003
Pages: 179
Authors: Matthew Gast
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