3Com 8250 Bedienungsanleitung

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User Guide

Wireless LAN Access Points 8250/8750/8850

3CRWE825075A

3CRWE875075A

3CRWE885075A

(Models WL-450, WL-463, WL-464)

Part No. DUA82507-5AAA01

Published April 2005

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

1Introduction

Product Features 2

Security 2

Performance and Reliability 3

Dual G Radio Support 3

Virtual Access Point (VAP) Support 3

WDS Bridging and Spanning Tree Protocol (STP) Support 4

Manageability 5

Wireless Network Standards 5

802.11g 5

802.11a 6

Standard Network Configuration and Planning 7

Ad Hoc Wireless LAN 7

Infrastructure Wireless LAN 7

Infrastructure Wireless LAN for Roaming Wireless PCs 8

Advanced Network Configuration and Planning 9

Public/Private Access Point Service 9

Remote Building Wireless Access with the AP8850 9

Remote Building Wireless Access with the AP8250 and 802.11g Upgrade Kit 11

Terminology 13

2Installing the Access Point

Installation Requirements 15

Power Requirements 16

Safety Information 16

Deciding Where to Place Equipment and Performing A Site Survey 17

Before You Begin 18

Connecting the Standard Antennas 19

Connecting Power 20

Using the Power Supply 21

Using a Power-Over-Ethernet LAN Port 21

Checking the LEDs 22

Mounting on a Wall 22

Flat Surface Installation 24

Selecting and Connecting a Different Antenna Model 25

Power Settings on the Access Point for External Antennas 26

Installing Software Utilities 27

3System Configuration

Using the 3Com Wireless Device Manager 29

Launching a Wireless Device Configuration 29

Using the Pre-IP Configuration Wizard 31

Configuration Login 31

Setting the Country Code 31

Basic Setup 32

Advanced Setup 33

Identification 33

TCP/IP Settings 33

DHCP Client 33

Web Servers 34

Smart Monitor 34

RADIUS 35

Authentication 37

Filter Control 40

Filtering by VLAN 40

Enabling VLAN Filtering 40

Security Filters 41

Client List Timeout 41

Uplink Port MAC Address Filtering 41

Filtering by Ethernet Protocol Type 42

SNMP 43

Trap Destination 43

Trap Configuration 44

SNMP Users 45

Default Groups 45

Default Security Levels 45

Groups 46

SNMP Targets 47

SNMP Filter 47

Administration 48

WDS/STP Settings 49

Configuration Guidelines 50

Radio Bridge Roles 50

Bridge Address Entry 50

Scanning for WDS Links 51

Configuring Spanning Tree Protocol Settings 51

System Log 52

Status 53

Radio Interface 54

Radio Settings 54

Virtual Access Point (VAP) Configuration 54

Enabling Virtual Access Point (VAP) 54

Changing Radio Settings 56

Security 58

Selecting a Virtual Access Point (VAP) 58

Configuring Authentication 58

Configuring Encryption 58

WPA Configuration 59

WEP Configuration 60

How to setup the access point for RADIUS authentication 61

How to setup the access point for WPA with 802.1x Session keys 62

How to setup the access point for WPA with Pre-Shared (PSK) Key 63

WPA Configuration for Windows XP 64

4Troubleshooting

Regulatory Compliance Information

Index

1INTRODUCTION

The 3Com® Wireless LAN Access Points 8250, 8750, and 8850 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.

The 8250 also has the ability to have two radios installed in it, providing local

access point service on one radio and a full bandwidth WDS bridge on the other

radio. This configuration is ideal for providing wireless network access in remote

buildings.

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

Access 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. The access point also supports two radios and external antennas.

Access 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).

Access Point 8850—Creates a high-performance enterprise-class access point

in an 802.11g and an 802.11a WDS bridge.

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 the

Advanced Encryption Standard (AES). 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

IEEE 802.1x supplicant support

SSH v2

HTTP/HTTPS

SNMP v3

Temporal Key Integrity Protocol (TKIP)

Legacy WEP 40/64 bit, 128 bit and 152 bit

Wireless Protected Access (WPA)

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

EAP-TTLS, and PEAP

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.

Dual G Radio support allows two 802.11g radios to be installed in the same

access point.

Virtual Access Point (VAP) support provides flexibility by allowing a single

access point radio to operate as two separate access points.

Wireless Distribution System (WDS) Bridging support allows you to create

large wireless networks in areas where pulling wires is restricted or

cost-prohibitive by linking several wireless access points together with WDS

links.

Dual G Radio Support

Dual G Radio support allows you to install two 802.11g radios in the same device,

providing local access point service on one radio and a full bandwidth WDS

bridge on the other radio. This configuration is ideal for providing wireless

network access in remote buildings.

Virtual Access Point (VAP) Support

Virtual Access Point (VAP) support allows an access point radio to operate as two

separate access points, providing multiple wireless services to clients in a network.

Each VAP can be configured to provide access to different network resources and

can support different levels of security.

For example, in a university network, an AP could be used to offer two services:

The first service provides access to protected data for authenticated university

staff members, while the second service provides open access to the Internet for

unauthenticated users, such as students or visitors.

Two VAPs per radio are available, and each VAP can be configured with its own

security settings.

For information on setting up and configuring VAPs, see “Enabling Virtual Access

Point (VAP)” on page 54.

WDS Bridging and Spanning Tree Protocol (STP) Support

A Distribution System (DS) is a network (typically a wired network) that

interconnects separate access points into a single LAN. With WDS, the

interconnection no longer needs to be physically wired. WDS uses the wireless

medium to interconnect separate access points, thereby eliminating the cost and

inconvenience that may hinder wire installations.

A WDS link can be used in a simple point-to-point link, a complex

point-to-multipoint link, or a multilayer topology.

Point-to-Point WDS Link. The following example shows a point-to-point WDS

link configured between two access points.

Point-to-Multipoint WDS Link. The following example shows

point-to-multipoint WDS links configured between multiple access points.

Wireless Desktops Wireless Desktops

WDS Link

Wireless Desktops

Point-to-Point WDS Link

WDS Link

Wireless Desktops

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