3Com SUPERSTACK 3 WEBCACHE 3000 Bedienungsanleitung

http://www.3com.com/

Part No. DUA1611-5AAA04

Published November 2002

SuperStack®3

Webcache

User Guide

SuperStack 3 Webcache 1000 3C16115

SuperStack 3 Webcache 3000 3C16116

SuperStack 3 Web Site Filter 3C16118

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3Com Corporation

5400 Bayfront Plaza

Santa Clara, California

95052-8145

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 Technologies.

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

to time without obligation on the part of 3Com Technologies to provide notification of such revision or

change.

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

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

NT are registered trademarks of Microsoft Corporation. Novell and NetWare are registered trademarks of

Novell, Inc. UNIX is a registered trademark in the United States and other countries, licensed exclusively

through X/Open Company, Ltd.

Netscape Navigator is a registered trademark of Netscape Communications.

JavaScript is a trademark of Sun Microsystems

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

associated.

ENVIRONMENTAL STATEMENT

It is the policy of 3Com Corporation to be environmentally-friendly in all operations. To uphold our policy, we

are committed to:

Establishing environmental performance standards that comply with national legislation and regulations.

Conserving energy, materials and natural resources in all operations.

Reducing the waste generated by all operations. Ensuring that all waste conforms to recognized environmental

standards. Maximizing the recyclable and reusable content of all products.

Ensuring that all products can be recycled, reused and disposed of safely.

Ensuring that all products are labelled according to recognized environmental standards.

Improving our environmental record on a continual basis.

End of Life Statement

3Com processes allow for the recovery, reclamation and safe disposal of all end-of-life electronic components.

Regulated Materials Statement

3Com products do not contain any hazardous or ozone-depleting material.

Environmental Statement about the Documentation

The documentation for this product is printed on paper that comes from sustainable, managed forests; it is

fully biodegradable and recyclable, and is completely chlorine-free. The varnish is environmentally-friendly, and

the inks are vegetable-based with a low heavy-metal content.

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CONTENTS

ABOUT THIS GUIDE

Conventions 18

Related Documentation 19

Documentation Comments 20

Product Registration 20

IGETTING STARTED

1WEB CACHING CONCEPTS AND DEPLOYMENT

What is the Webcache? 24

The Webcache and 3Com Network Supervisor 24

Before You Begin 25

Network Configuration Concepts 26

IP Addresses 26

IP Address Rules 27

Subnets and Using a Subnet Mask 27

Domain Name System 28

Domain Name System Syntax 28

Default Router 29

Web Caching Overview 30

Current and Expired Content 32

Revalidating HTTP Content 32

Deployment Modes Overview 32

Choosing a Deployment Mode 35

Transparent Cache Deployment 36

Deploying the SuperStack 3 Switch 4400, 4924 or 4950 with the

Webcache 38

Deploying the SuperStack 3 Server Load Balancer with the

Webcache 40

Web Cache Communication Protocol (WCCP) 41

WCCP Version 1 43

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WCCP Version 2 43

Proxy Relay Deployment 44

Proxy Cache Deployment 45

Manual Configuration 47

Proxy Auto Configuration (PAC) Files 48

Web Proxy Auto-Discovery (WPAD) 49

Third-party Tools 52

Inline Cache Deployment 52

Parent Caching 53

How does Parent Caching Work? 54

Parent Caching Network Example 55

ICP Caching 56

2INSTALLING THE WEBCACHE

Package Contents 60

Webcache — Front View Detail 61

LEDs 61

Webcache — Rear View Detail 62

Power Socket 63

Console Port 63

WAN Port 63

LAN Port 63

WAN and LAN Port LEDs 64

Choosing a Suitable Site 65

Rack-Mounting the Webcache 65

The Power-up Sequence 69

Powering-up the Webcache 69

Checking for Correct Operation of LEDs 69

Deploying the Webcache in Your Network 70

Setting Up the Webcache for Management 71

Setting Up Using the Web Interface 71

Setting Up Using the Command Line Interface 74

Connecting the Webcache to the Live Network 76

Choosing the Correct Cables 76

Connecting the Webcache 77

Installing an Additional Cache Storage Device 77

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II MANAGING THE WEBCACHE

3USING THE CLI INTERFACE

Accessing the Command Line Interface 82

Accessing the Command Line Interface Through the Console Port 82

Accessing the Command Line Interface Over the Network 83

Logging In To the Command Line Interface 83

Exiting the Interface 84

Understanding the Command Line Interface 84

Entering Commands 85

Displaying Menus 86

Obtaining Help 86

4USING THE WEB INTERFACE

Management Software Interfaces 88

Logging in as a Default User 88

Accessing the Web Interface 89

Understanding the Web Interface 91

The Toolbar 92

The Navigation Tree 94

The Information Area 96

The Device Mimic 96

The Status Tables 99

The Performance View 100

The Help View 100

5SECURING ACCESS TO THE WEBCACHE MANAGEMENT

INTERFACES

Passwords 104

Setting Passwords 104

Management Interface Setup 105

Disabling Port 80 105

Restricting Address Access 105

Password Recovery 106

Enabling/Disabling Password Recovery 106

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Performing Password Recovery 107

III CONFIGURING THE WEBCACHE

6CONFIGURING DEPLOYMENT MODES

Configuring Transparent Cache Mode 112

Configuring WCCP V1 112

Configuring WCCP V2 113

Configuring Proxy Relay with the SuperStack 3 Firewall 114

Configuring Proxy Cache Mode 115

Creating a Proxy Auto-configuration File 115

Using the Webcache as a PAC File Server 116

Configuring the Client Web Browser 117

Configuring Inline Cache Mode 118

Configuring Parent Caching 119

Creating a Parent Cache Exclusion List 119

Saving the Parent Cache Exclusion List 121

Clearing the Parent Cache Exclusion List 122

Configuring ICP Caching 123

Adding ICP Peers 124

Deleting ICP Peers 125

7STATIC ROUTES

What are Static Routes? 128

Static Routes Example 128

Advantages of Static Routes 129

Configuring Static Routes 129

8SYSTEM TIME

Configuring the System Time 132

Network Time Protocol 132

Choosing a Network Time Protocol Server 133

Configuring the System Time Using the Network Time Protocol 134

Configuring the System Time Manually 134

System Time and Performance Graphs 135

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IV CONTROLLING AND MONITORING WEB ACCESS

9MONITORING WEB ACCESS

Access Logging 140

Filter Logging 140

Storing the Log Files 140

Viewing the Access Log 142

Analyzing the Access Log 142

Viewing the Filter Log 143

10 USING CONTENT FILTERING

Introducing Content Filtering 146

Understanding Content Filtering Modes 146

3Com Web Site Filter 147

Registering the Webcache 149

Activating the Web Site Filter 149

Downloading a New Web Site Filter 150

Setting Up the 3Com Web Site Filter 151

Setting Up

Filtering Policies 152

Testing a URL 154

Websense Enterprise Filtering 155

Acquiring the Websense Enterprise Filtering Software 155

Installing the Websense Enterprise Filtering Software 155

Setting Up Websense Enterprise Filtering on your Webcache 156

Manual Content Filtering 157

Setting Up Manual Content Filtering 158

Default Rule 159

Setting the Default Rule 159

Filter Logging 159

Blocking and Logging Behavior 160

Setting Blocking and Logging Behavior 160

Storing the Filter Log 161

Viewing the Filter Log 161

Web Client Blocking 161

Using Web Client Blocking with DHCP Servers 162

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Setting Up Web Client Blocking 162

Creating a Web Client Blocking List 163

Saving the Web Client Blocking List 165

Clearing the Web Client Blocking List 166

Filter Exclusions 166

Setting Up Filter Exclusion Lists 166

Editing the Filter Exclusion List 166

Loading Entries From a File into the Filter Exclusion List 167

Saving the New Filter Exclusion List 168

Clearing the Filter Exclusion List 169

Setting Up Allow Lists and Deny Lists 169

Editing the Allow and Deny Lists 169

Loading Entries From a File into the Allow List or Deny List 172

Saving the New Allow List or Deny List 173

Clearing the Allow List or Deny List 173

Keyword Blocking 174

Setting Up Keyword Blocking Lists 174

Editing the Keyword Blocking List 174

Loading Entries From a File into the Keyword Blocking List 175

Saving the New Keyword Blocking List 176

Clearing the Keyword Blocking List 176

Customizing the Content Filter Response Screen 176

VCONTROLLING CACHING

11 CONTROLLING HOW WEB SITES ARE CACHED

Cache Control 182

Setting Up Cache Control 182

Creating a Cache Control List 182

Saving the Cache Control List 185

Clearing the Cache Control List 185

Clearing the Cache 186

Cache Bypass 186

Setting Up Cache Bypass 188

Creating Cache Bypass Lists 188

Saving the Cache Bypass Lists 190

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Clearing the Cache Bypass Lists 191

12 PRELOADING CONTENT

Introduction 194

Advantages and Disadvantages of Preloading Content 194

Methods of Preloading Content 195

Setting up Content Preload 195

Preloading a Site 196

Adding/Editing Scheduled Tasks 197

Temporarily Disabling a Scheduled Task 198

Forcing a Preload Task to Start Immediately 198

Deleting Scheduled Tasks 199

Checking the Status of Scheduled Tasks 199

Viewing Details of Scheduled Tasks 200

Using the 3Com Web Scheduler Browser Client 201

Configuring the Webcache for the 3Com Web Scheduler Browser

Client 201

Installing the 3Com Web Scheduler Browser Client 202

VI MONITORING THE WEBCACHE

13 MONITORING SYSTEM EVENTS

System Events 208

Email Notification 208

Configuring Email Notification 208

SMTP Authentication 210

SNMP Traps 212

Configuring SNMP Traps 212

Configuring SNMP Community Strings 212

Automatic System Events 214

14 PERFORMANCE MONITORING

Performance Monitoring 220

Viewing Performance Graphs 220

Viewing Caching Performance Graphs 220

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Viewing I/O Performance Graphs 223

Viewing System Performance Graphs 224

Emailing Performance Graphs 224

Configuring Email Performance Graphs 225

15 SYSTEM DIAGNOSTICS

System Diagnostics 228

Pinging Other Devices 228

Performing a Ping 228

Tracing IP Addresses 229

Performing a Trace Route 229

System Log 230

Configuring the System Log 230

What is a Syslog Server? 231

Obtaining a Syslog Server 231

Viewing the System Log 232

VII MANAGING THE WEBCACHE SOFTWARE

16 CONFIGURATION MANAGEMENT

Saving and Restoring Configurations 236

Saving a Configuration 237

Restoring a Configuration 238

17 SOFTWARE UPGRADES

Software Upgrades 240

Software Upgrade SNMP Traps 240

Unsuccessful Software Upgrades 241

Software Downgrades 241

Detecting a Software Upgrade 241

Performing a Software Upgrade 243

Performing an Automatically Detected Software Upgrade 243

Performing a Manual Software Upgrade 245

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