3Com 3CRWE825075A Manuel utilisateur

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User Guide

Wireless LAN Access Points 8250/8500/8750

3CRWE825075A

3CRWE850075A

3CRWE875075A

(Models WL-450, WL-462, WL-463)

Ve r s i on 2

Published January, 2004

Version 2.3.12

3Com Corporation

350 Campus Drive

Marlborough, MA

01752-3064

reproduced in any form or by any means or used to make any derivative work (such as translation,

transformation, or adaptation) without written permission from 3Com Corporation.

3Com Corporation reserves the right to revise this documentation and to make changes in content from

time to time without obligation on the part of 3Com Corporation to provide notification of such

revision or change.

3Com Corporation provides this documentation without warranty, term, or condition of any kind,

either implied or expressed, including, but not limited to, the implied warranties, terms or conditions of

merchantability, satisfactory quality, and fitness for a particular purpose. 3Com may make

improvements or changes in the product(s) and/or the program(s) described in this documentation at

any time.

If there is any software on removable media described in this documentation, it is furnished under a

license agreement included with the product as a separate document, in the hard copy documentation,

or on the removable media in a directory file named LICENSE.TXT or !LICENSE.TXT. If you are

unable to locate a copy, please contact 3Com and a copy will be provided to you.

UNITED STATES GOVERNMENT LEGEND

If you are a United States government agency, then this documentation and the software described

herein are provided to you subject to the following:

All technical data and computer software are commercial in nature and developed solely at private

expense. Software is delivered as “Commercial Computer Software” as defined in DFARS

252.227-7014 (June 1995) or as a “commercial item” as defined in FAR 2.101(a) and as such is

provided with only such rights as are provided in 3Com’s standard commercial license for the

Software. Technical data is provided with limited rights only as provided in DFAR 252.227-7015

(November 1995) or FAR 52.227-14 (June 1987), whichever is applicable. You agree not to remove or

deface any portion of any legend provided on any licensed program or documentation contained in, or

delivered to you in conjunction with, this User Guide.

Unless otherwise indicated, 3Com registered trademarks are registered in the United States and may or

may not be registered in other countries.

3Com, the 3Com logo, and SuperStack are registered trademarks of 3Com Corporation.

Wi-Fi is a trademark of the Wireless Ethernet Compatibility Alliance.

All other company and product names may be trademarks of the respective companies with which they

are associated.

EXPORT RESTRICTIONS: This product contains Encryption and may require US and/or Local

Government authorization prior to export or import to another country.

Contents

Introduction

Product Features 6

Security 7

Performance and Reliability 7

Manageability 7

Wireless Network Standards 8

Far-Reaching 802.11g 8

High-Performance 802.11a 8

Network Configuration and Planning 9

Ad Hoc Wireless LAN 9

Infrastructure Wireless LAN 9

Infrastructure Wireless LAN for Roaming Wireless PCs 10

Terminology 11

1Installing the Access Point

Installation Requirements 13

Power Requirements 14

Safety Information 14

Deciding Where to Place Equipment and Performing A Site Survey 15

Before You Begin 16

Connecting the Standard Antennas 16

Connecting Power 17

Using the Power Supply 18

Using a Power-Over-Ethernet LAN Port 19

Checking the LEDs 19

Mounting on a Wall 19

Flat Surface Installation 21

Selecting and Connecting a Different Antenna Model 22

Power Settings on the Access Point for External Antennas 24

Installing Software Utilities 24

2System Configuration

Using the 3Com Wireless Device Manager 26

Launching a Wireless Device Configuration 26

Using the Pre-IP Configuration Wizard 28

Configuration Login 28

Setting the Country Code 28

Basic Setup 29

Advanced Setup 30

Identification 30

TCP/IP Settings 30

DHCP Client 30

Secure Web Server Connection 31

RADIUS 31

Authentication 32

Filter Control 35

Filtering by VLAN 35

Security Filters 36

Client List Timeout 36

Uplink Port MAC Address Filtering 36

Filtering by Ethernet Protocol Type 37

SNMP 37

Administration 38

System Log 39

Status 40

Radio Interface 40

Radio Settings 40

Security 42

Configuring Authentication 43

Configuring Encryption 43

WPA Configuration 44

WEP Configuration 45

How to setup the access point for RADIUS authentiction 46

How to setup the access point for WPA with 802.1x Session keys 47

How to setup the access point for WPA with Pre-Shared (PSK) Key 48

WPA Configuration for Windows XP 49

3Troubleshooting

ATechnical Support

Obtaining Support for your Product 54

Purchase Value-Added Services 54

Where To Go For Help 54

Troubleshoot Online 54

Access Software Downloads 55

Telephone Technical Support and Repair 55

Regulatory Compliance Information

Index

INTRODUCTION

The 3Com® Wireless LAN Access Points 8250, 8500, and 8750 offer a dual-mode

architecture that supports 802.11g, 802.11a and 802.11b wireless users on a single

device. This means you can mix and match radio bands to meet different coverage and

bandwidth needs within the same area. Different access point models give you the

flexibility to choose to support both radio modes immediately or choose one radio

mode now and upgrade to newer standards later as they become available with an

easy-to-install optional Mini PCI upgrade kit.

With their flexibility and unfettered access, wireless LANs are changing the way

people work. Now with 3Com’s enterprise-class wireless access points, you can build

a cost effective, reliable, secure wireless network that provides users with seamless

connectivity to the Internet, company intranet, and the wired corporate network from

anywhere they happen to be—conference room, cafeteria or office.

3Com’s dual-mode design supports 802.11g, 802.11a and 802.11b wireless standards

on a single access point. This capability increases configuration and coverage

flexibility and protects your network investment for both existing and emerging

wireless standards.

Industry-leading security features and comprehensive management and performance

features combine to make these enterprise class wireless access points an ideal choice

for organizations ready to serve their increasingly mobile workforce.

PRODUCT FEATURES

oAccess Point 8250—Creates an enterprise-class wireless LAN supporting up to

250 simultaneous users. The single wireless interface 802.11g 2.4 GHz, 54-Mbps

access point upgrades to 802.11g-802.11a dual mode with optional upgrade kit.

oAccess Point 8500—Creates a high-performance enterprise-class wireless LAN

supporting up to 250 simultaneous users. The single wireless interface 802.11a 5

GHz, 54-Mbps access point upgrades to 802.11b/g-802.11a dual mode with

optional upgrade kit.

oAccess Point 8750—Creates a high-performance enterprise-class dual-mode

802.11g and 802.11a wireless LAN supporting up to 250 simultaneous users up to

100 meters (328 feet).

SECURITY

3Com offers one of the most robust suite of standards-based security on the market

today. To protect sensitive data broadcast over the wireless LAN, 3Com supports

Wireless Equivalent Privacy (WEP) RC4 40/ 64-bit, 128-bit and 152-bit shared-key

encryption. 3Com strengthens this basic security mechanism with additional security

features, including MAC address access control lists, IEEE 802.1x per-port user

authentication with RADIUS server authentication support, Temporal Key Integrity

Protocol (TKIP), Advanced Encryption Standard (AES), Wireless Protected Access

(WPA) and Extensible Authentication Protocol (EAP) support: EAP-MD5, EAP-TLS,

EAP-TTLS, and PEAP.

In addition to standards-based security, 3Com 128-bit Dynamic Security Link offers a

high level of security, requiring a user name and password to access the wireless LAN.

PERFORMANCE AND RELIABILITY

3Com wireless access point performance features ensure reliable and seamless

connections for users wherever they roam. Automatic channel selection automatically

finds the least loaded channel for interference-free communication. Auto network

connect and dynamic rate shifting keep users connected through a wide variety of

conditions by changing to the optimum connection speed as they move through the

network.

MANAGEABILITY

3Com offers a wide range of standards-based management support, from SNMP to

3Com Network Supervisor and HP OpenView for seamless integration with your

wired network.

Wireless Infrastructure Device Manager and Wireless LAN Device Discovery tools let

you configure parameters, run diagnostics, backup and restore configurations, and

monitor performance from anywhere on the network using an embedded web server

browser. You can also update wireless device software on multiple devices using

3Com Network Supervisor to simplify bulk updates.

With Power over Ethernet (PoE) support, the same Category 5 cable that connects your

access point to the data network also provides its power. A single cable installation

dramatically improves your choice of mounting configurations because you no longer

need to consider AC power outlet locations. PoE support makes it easier than ever to

overcome installation problems with difficult-to-wire or hard-to-reach locations.

WIRELESS NETWORK STANDARDS

Understanding the characteristics of the 802.11g and 802.11a standards can help you

make the best choice for your wireless implementation plans.

FAR-REACHING 802.11G

802.11g operates in the 2.4 GHz band at up to 54Mbps. Ratified in 2003, it supports

the widest coverage—up to 100 meters (328 feet). However, is subject to a greater risk

of radio interference because it operates in the more popular 2.4 GHz band.

Consider 802.11g when you need wider coverage and vendor compatibility and you

are:

oMaintaining support for existing 802.11b users and the existing wireless investment

while providing for expansion into 802.11g.

oImplementing a complete wireless LAN solution, including bridges, gateways,

access points and clients; Wi-Fi certification guarantees compatibility

among vendors

oProviding access to hot spots in public spaces such as coffee shops or university

cafeterias

HIGH-PERFORMANCE 802.11A

Ratified in 2002, 802.11a is IEEE’s more recent wireless standard. It operates at the 5

GHz band and supports data rates at up to 54 Mbps. For those organizations

demanding even higher speeds, a “turbo mode” feature can boost throughput rates up

to 108 Mbps. And because there are fewer devices in the 5 GHz band, there’s less

potential for RF interference. However, because it is at an entirely different radio

spectrum, it is not compatible with 802.11g.

The higher spectrum provides about 50 meters (164 feet) of coverage—about half

what 802.11g offers.

Consider 802.11a when you need high throughput in a confined space and you are:

oRunning high-bandwidth applications like voice, video, or multimedia over a

wireless network that can benefit from a fivefold increase in data throughput

oTransferring large files like computer aided design files, preprint publishing

documents or graphics files, such as MRI scans for medical applications, that

demand additional bandwidth

oSupporting a dense user base confined to a small coverage area. Because 802.11a

has a greater number of non-overlapping channels, you can pack more access

points in a tighter space.

NETWORK CONFIGURATION AND PLANNING

The wireless solution supports a stand-alone wireless network configuration as well as

an integrated configuration with 10/100 Mbps Ethernet LANs.

The wireless network cards, adapters, and access point can be configured as:

oAd hoc for departmental or SOHO LAN

oInfrastructure for wireless LAN

oInfrastructure wireless LAN for roaming wireless PCs

ADHOC WIRELESS LAN

An ad hoc wireless LAN consists of a group of computers, each equipped with a

wireless adapter, connected via radio signals as an independent wireless LAN.

Computers in a specific ad hoc wireless LAN must therefore be configured to the same

radio channel. An ad hoc wireless LAN can be used for a branch office or SOHO

operation.

INFRASTRUCTURE WIRELESS LAN

The access point can also provide access to a wired LAN for wireless workstations. An

integrated wired/wireless LAN is called an infrastructure configuration. A Basic

Service Set (BSS) consists of a group of wireless PC users, and an access point that is

directly connected to the wired LAN. Each wireless PC in this BSS can talk to any

computer in its wireless group via a radio link, or access other computers or network

resources in the wired LAN infrastructure via the access point.

Ad Hoc Wireless LAN

Notebook with

Wireless USB Adapter

Notebook with

Wireless PC Card

PC with Wireless

PCI Adapter

The infrastructure configuration not only extends the accessibility of wireless PCs to

the wired LAN, but also increases the effective wireless transmission range for

wireless PCs by passing their signal through one or more access points.

A wireless infrastructure can be used for access to a central database, or for connection

between mobile workers, as shown in the following figure.

INFRASTRUCTURE WIRELESS LAN FOR ROAMING WIRELESS

PCS

The Basic Service Set (BSS) is the communications domain for each access point. For

wireless PCs that do not need to support roaming, set the domain identifier (SSID) for

the wireless card to the SSID of the access point to which you want to connect. A

wireless infrastructure can also support roaming for mobile workers. More than one

access point can be configured to create an Extended Service Set (ESS). By placing the

access points so that a continuous coverage area is created, wireless users within this

ESS can roam freely.

File

Server

Switch

Desktop PC

Access Point

Wired LAN Extension

to Wireless Adapters

PC with Wireless

PCI Adapter

Notebook with Wireless

PC Card Adapter

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