.NODE

11 Performance Tuning

Performance Tuning

In the past, wireless network administrators have probably received a bit of a free ride. Wireless is new and cool, and people do not know what sort of service they should expect. Users are happy that it works at all, and it is both easy and correct to tell them that they should not expect the same performance they would see on a 100BaseT Ethernet. Many wireless installations do not have large user communities and therefore do not have dozens or hundreds of stations trying to associate with a small number of access points. Furthermore, most wireless networks are logically subordinate to existing wired networks. 802.11 was designed to complement existing LANs, not replace them. When the wired LAN is the primary network, people can still get the job done without the wireless network, and it is seen as less critical. Most likely, your biggest problems are positioning your access points so you have coverage everywhere you want it, installing drivers, and keeping your security configuration up to date.

However, networks have a way of growing, and users have a way of becoming more demanding. Your network's performance "out of the box" is probably fairly poor, even if no one but you notices. Changing the physical environment (by experimenting with access point placement, external antennas, etc.) may alleviate some problems, but others may best be resolved by tuning administrative parameters. This chapter discusses some of the administrative parameters that can tuned to improve the behavior of your wireless network.

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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