3Com WL-455 Bedienungsanleitung

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User Guide

Wireless LAN Access Point 7250

3CRWE725075

(Model WL-455)

Published December, 2003

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.

INTRODUCTION

Product Features - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4

Security - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4

Performance and Reliability - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5

Manageability - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5

Wireless Network Standard - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5

Far-Reaching 802.11g- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5

Network Configuration and Planning - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6

Ad Hoc Wireless LAN - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6

Infrastructure Wireless LAN- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6

Infrastructure Wireless LAN for Roaming Wireless PCs - - - - - - - - - - - - - - - - - - - - 7

Terminology - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8

INSTALLING THE ACCESS POINT

Installation Requirements - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 10

Power Requirements - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 11

Safety Information - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 11

Deciding Where to Place Equipment and Performing A Site Survey- - - - - - - - - - - - - - - - - 12

Before You Begin - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 13

Connecting the Standard Antennas - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 13

Connecting Power - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 14

Using The Included AC Adapter- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 15

Using An Optional Power-Over-Ethernet Injector- - - - - - - - - - - - - - - - - - - - - - - - 15

Using a Power-Over-Ethernet LAN Port - - - - - - - - - - - - - - - - - - - - - - - - - - - - 16

Checking the LEDs- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 17

Mounting on a Wall - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 18

Flat Surface Installation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 19

Selecting and Connecting a Different Antenna Model - - - - - - - - - - - - - - - - - - - - - - - 20

Power Settings on the Access Point for External antennas - - - - - - - - - - - - - - - - - - - - - 22

Installing Software Utilities - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 23

SYSTEM CONFIGURATION

Using the 3Com Wireless Device Manager - - - - - - - - - - - - - - - - - - - - - - - - - - - - 24

Launching a Wireless Device Configuration - - - - - - - - - - - - - - - - - - - - - - - - - - 24

Using the Pre-IP Configuration Wizard - - - - - - - - - - - - - - - - - - - - - - - - - - - - 26

Contents

Configuration Login - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 26

Setting the Country Code - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 26

Basic Setup - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 27

Advanced Setup - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 28

Identification- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 28

TCP/IP Settings - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 28

DHCP Client - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 28

Secure Web Server Connection - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 29

RADIUS- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 29

Authentication - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 30

Filter Control - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 33

Filtering by VLAN - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 33

Security Filters - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 34

Client List Timeout - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 34

Uplink Port MAC Address Filtering - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 34

Filtering by Ethernet Protocol Type - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 35

SNMP - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 35

Administration - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 36

System Log - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 37

Status - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 38

Radio Interface- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 39

Radio Settings - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 39

Security - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 40

Configuring Authentication - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 40

Configuring Encryption - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 41

WPA Configuration - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 42

WEP Configuration - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 43

How to setup the access point for RADIUS authentication - - - - - - - - - - - - - - - - - - - - - 44

How to setup the access point for WPA with 802.1x Session keys - - - - - - - - - - - - - - - - - - 45

How to setup the access point for WPA with Pre-Shared (PSK) Key - - - - - - - - - - - - - - - - 46

WPA Configuration for Windows XP - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 47

TROUBLESHOOTING

Troubleshooting Table - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 49

TECHNICAL SUPPORT

Obtaining Support for your Product - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 52

Purchase Value-Added Services - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 52

Where To Go For Help - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 52

Troubleshoot Online - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 52

Access Software Downloads - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 53

Telephone Technical Support and Repair - - - - - - - - - - - - - - - - - - - - - - - - - - - - 53

REGULATORY COMPLIANCE INFORMATION

1INTRODUCTION

The 3Com® Wireless LAN Access Point 7250 supports 802.11g and 802.11b wireless

users.

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.

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

Access Point 7250—The single wireless interface 802.11g 2.4 GHz, 54-Mbps access

point creates an enterprise-class wireless LAN supporting up to 250 simultaneous

users.

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 STANDARD

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). 802.11g shares the 2.4 GHz band

with other popular 802.11b devices that use this unlicensed radio spectrum. Use of

other devices in this frequency band can cause interference with 802.11g signals.

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

are:

• Maintaining support for existing 802.11b users and the existing wireless investment

while providing for expansion into 802.11g.

• Implementing a complete wireless LAN solution, including bridges, gateways,

access points and clients; Wi-Fi certification guarantees compatibility

among vendors.

• Providing access to hot spots in public spaces, such as coffee shops or university

cafeterias.

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:

• Ad hoc for departmental or SOHO LAN

• Infrastructure for wireless LAN

• Infrastructure 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.

Ad Hoc Wireless LAN

Notebook with Wireless USB Adapter

Notebook with Wireless PC Card

PC with Wireless PCI Adapter

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.

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.

Wired LAN Extension to

File

Desktop

Server

Notebook with Wireless

PC Card Adapter

Access Point

PC with Wireless

PCI Adapter

Wireless Adapters

TERMINOLOGY

Access Point—An internetworking device that seamlessly connects wired and

wireless networks.

Ad Hoc—An ad hoc wireless LAN is a group of computers, each with LAN adapters,

connected as an independent wireless LAN.

Backbone—The core infrastructure of a network. The portion of the network that

transports information from one central location to another central location where it is

unloaded onto a local system.

Base Station—In mobile telecommunications, a base station is the central radio

transmitter/receiver that maintains communications with the mobile radiotelephone

sets within its range. In cellular and personal communications applications, each cell

or micro-cell has its own base station; each base station in turn is interconnected with

other cells’ bases.

BSS—Basic Service Set. It is an access point and all the LAN PCs that are associated

with it.

CSMA/CA—Carrier Sense Multiple Access with Collision Avoidance.

Seamless Roaming

File Server

Desktop PC

Notebook with Wireless

PCI Card Adapter

Access Point

Switch

Notebook with Wireless

PCI Card Adapter

Access Point

PC withWireless

PCI Adapter

Switch

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