3Com AirConnect Bedienungsanleitung

AirConnect

11 Mbps

Wireless LAN Access Point

User Guide

Version 2.0

Part No. 09-2045-000

Published December 2000

3Com Corporation

■

5400

Bayfront Plaza

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Santa

Clara, California

■

95052-8145

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.

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or change.

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

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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

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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 (Nov 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 and AirConnect are registered trademarks and the 3Com logo is a trademark of 3Com Corporation.

Microsoft, MS-DOS, Windows, and Windows NT are registered trademarks of Microsoft Corporation.

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

associated.

EXPORT RESTRICTIONS:

This product or software contains encryption code which may not be exported or

transferred from the U.S. or Canada without an approved US Department of Commerce export license.

ONTENTS

VERVIEW

IGITAL

IRELESS

ETWORKING

Introduction 9

AirConnect Network Topologies 9

Peer-To-Peer Network 9

Same-Site Separate Networks 10

Single AP Bridge 11

Multiple-AP Full Coverage Network 12

AirConnect Access Point 12

AP Features 13

PowerBASE-T 13

Radio Basics 14

Cellular Coverage 15

Wireless LAN Service Area 16

802.1d Spanning Tree Support 16

Site Topography 17

Site Surveys 17

Theory of Operation 17

MAC Layer Bridging 17

Filtering and Access Control 18

DHCP Support 18

Media Types 18

Bridging Support 19

PPP Connection 20

Direct-Sequence Spread Spectrum 21

Wireless Client Association Process 21

Roaming 22

Extended Roaming 22

Security 23

Supporting CAM and PSP Stations 23

HTTP, HTML Web Server Support 24

Management Options 24

Programmable SNMP Trap Support 25

Using SNMP 25

Increased MIB Support 25

Using the User Interface 26

NSTALLING

CCESS

OINT

HARDWARE

Introduction 27

Precautions 27

Package Contents 27

Requirements 27

Network Connection 28

10BASE-T UTP 28

Single Cell 28

Power Options 28

Mounting the AP 29

Flat Surface 29

Wall Mount 29

Ceiling Mount 30

Using the PowerBASE-T 32

LED Indicators 33

Troubleshooting 34

Verify AP Operation 34

Verify Network Wiring and Topology 35

Setting Up Wireless Clients 35

ONITORING

TATISTICS

Introduction 37

System Properties 37

Interface Statistics 37

Forwarding Counts 37

Ethernet Statistics 38

Radio Frequency Statistics 38

Miscellaneous Statistics 39

Analyzing Retries 39

Clearing Statistics 40

Known APs 40

ONFIGURING

THE

CCESS

OINT

SING

ROWSER

Introduction 41

Gaining Access to the User Interface (UI) Using a Web Browser 41

Using a Web Browser 41

Help File Access 41

Setup Network Web Server Help File Access 41

Accessing the Web Browser UI 42

Changing UI Access 44

Installing the Access Point 45

Adding Additional Gateways 45

Conﬁguring the AP 46

Security 46

Adding Allowed Wireless Clients 46

Adding or Deleting a Range of Allowed Wireless Clients 46

Adding or Deleting Disallowed Wireless Clients 46

Enabling or Disabling Encryption 47

Encryption Upgrade Access Codes 47

Special Conﬁguration Considerations 47

Disable Short Preamble 47

System Parameters 48

Radio Frequency Parameters 49

Conﬁguring the SNMP Agent 50

Conﬁguring PPP/Modem 51

Conﬁguring the Originating Modem 51

Conﬁguring the Answering Modem 52

Filtering 52

Filtering to Forward Packets 52

Filtering to Discard Packets 52

Removing Filtered Packet Types (Networking Protocols) 53

Disabling Type Filtering 53

Updating AP Firmware 53

Special Functions 54

ONITORING

IRELESS

LIENTS

Introduction 55

Wireless Clients 55

Clearing Statistics 56

ONFIGURING

THE

AP U

SING

THE

ASCII I

NTERFACE

Introduction 57

Gaining Access to the User Interface (UI) 57

Using Telnet 57

Using a Direct Serial Connection 58

Using a Dial-up Connection 58

Navigating the UI 58

Entering Admin Mode 59

Changing the Access to the UI 60

Conﬁguring for Dial-Up to the UI 60

Conﬁguring The Serial Port 60

Conﬁguring the Dial-Up System 61

Hanging Up 61

Access Point Installation 62

Conﬁguring the AP 63

System Parameters 63

Radio Parameters 64

Conﬁguring PPP 66

PPP Direct 66

Establishing a Connection 66

PPP with Modems 66

Originating AP 67

Answering AP 67

Conﬁguring the SNMP Agent 68

Conﬁguring the Access Control List 69

Range of Wireless Clients 69

Adding Allowed Wireless Clients 70

Removing Allowed Wireless Clients 70

Enable/Disable the ACL 70

Removing All Allowed Wireless Clients 70

Load ACL from Wireless Client List 71

Filtering 71

Address Filtering 71

Adding Disallowed Wireless Clients 71

Removing Disallowed Wireless Clients 71

Type Filtering 71

Adding Filter Types 71

Removing Filter Types 72

Controlling Type Filters 72

Clearing Wireless Clients from the AP 72

Setting Logging Options 72

Manually Updating AP Firmware 73

Update using TFTP 74

Updating using Xmodem 74

Auto Upgrade all APs Via Messaging 76

Performing Pings 77

Extended Roaming Using MD5 Authentication 77

Enabling or Disabling Encryption 78

Encryption Conﬁguration Requirements 78

Encryption Upgrade Access Codes 78

Special Conﬁguration Considerations 78

Disable Short Preamble 78

WLAP Mode Setting 79

Saving, Resetting, and Restoring Conﬁgurations 79

Saving a Conﬁguration 79

Resetting an AP 79

Restoring the Default AP Conﬁguration 80

CCESS

OINT

PECIFICATIONS

ECHNICAL

UPPORT

Online Technical Services 83

World Wide Web Site 83

3Com FTP Site 83

Support from Your Network Supplier 83

Support from 3Com 84

Returning Products for Repair 85

NDEX

ARRANTY

AND

EGULATORY

OMPLIANCE

3Com Corporation Limited Warranty 91

Regulatory Compliance Information 93

3Com End User Software License Agreement 94

VERVIEW

IGITAL

IRELESS

ETWORKING

Introduction

AirConnect

from 3Com is made up of a series of products that work together to

deliver high-speed digital wireless networking. This technology provides connectivity

between wireless clients and network nodes in a variety of indoor environments,

and also provides bridging architecture between wired and wireless network

segments. AirConnect is based on the IEEE 802.11B standard, and delivers 11 Mbps

data transfer rates.

The core hardware products that make up an AirConnect network include

the following:

■

A wireless network interface card (NIC) installed in a wireless client, either

a PC Card installed in a notebook computer, or a PCI card installed in a

desktop computer.

■

Access point, or AP, which serves as a wireless network node.

■

PowerBASE-T (optional), which provides bus power to the access point when

connected to an Ethernet network.

Also included in your AirConnect kit are an AP mounting bracket and hardware,

a serial cable, a power adapter and associated power cables, and one CD: the

AirConnect Installation

CD.

AirConnect Network

Topologies

To better understand how the various AirConnect products work together to create

a wireless network, it might be helpful to depict a few of the possible AirConnect

network topologies. The topology used in a particular environment depends on many

factors, such as the functionality of the AP in the network, or desired data transfer

rates. Your AirConnect network topology will probably resemble one of the following

scenarios, or perhaps a combination of two or more.

Peer-To-Peer Network

The simplest AirConnect topology consists of one AP providing a single-cell

network for wireless clients. In this scenario, as shown in the ﬁgure below, the

wireless clients (notebook and desktop computers with the AirConnect NIC

installed) communicate through the AP on a peer-to-peer network. The clients can

be moved anywhere within the coverage area of the AP, and still communicate

with each other. The AP in this instance serves the same purpose as a stand-alone

network hub, and is not connected to any other network segments.

HAPTER

1: O

VERVIEW

IGITAL

IRELESS

ETWORKING

Same-Site Separate

Networks

In this scenario, as shown in the following ﬁgure, Multiple APs can coexist as

separate networks at the same site without interference using different network

identiﬁers (wireless LAN service areas). The wireless clients can move within the

coverage area of one AP and remain connected, or can roam (if conﬁgured to do

so) to the coverage area of a different AP, and communicate with the wireless

clients associated with that AP.

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