Linksys BEFSR81 - EtherFast Cable/DSL Router Manuale utente

A Division of Cisco Systems, Inc.

Model No.

WIRED with 8-Port Switch

Cable/DSL Router

BEFSR81

User Guide

EtherFast

EtherFast Cable/DSL Router with 8-Port Switch

Linksys is a registered trademark or trademark of Cisco Systems, Inc. and/or its affiliates in the U.S. and certain

How to Use this Guide

This User Guide has been designed to make understanding networking with the Router easier than ever. Look for

the following items when reading this Guide:

In addition to these symbols, there are definitions for technical terms that are presented like this:

Also, each figure (diagram, screenshot, or other image) is provided with a figure number and description, like

this:

Figure numbers and descriptions can also be found in the “List of Figures” section in the “Table of Contents”.

This exclamation point means there is a Caution or

Warning and is something that could damage your

property or the Router.

word: definition.

This checkmark means there is a Note of interest and

is something you should pay special attention to while

using the Router.

This question mark provides you with a reminder about

something you might need to do while using the Router.

Figure 0-1: Sample Figure Description

BEFSR81_V4-UG-30730NC JL

EtherFast Cable/DSL Router with 8-Port Switch

Table of Contents

Chapter 1: Introduction 1

Welcome 1

What’s in this Guide? 2

Chapter 2: Networking Basics 4

An Introduction to LANs 4

The Use of IP Addresses 4

Chapter 3: Getting to Know the Router 6

The Back Panel 6

The Front Panel 7

Chapter 4: Connecting the Router 8

Overview 8

Connection Instructions 9

Chapter 5: Configuring the PCs 10

Overview 10

Configuring Windows 98 and Millennium PCs 10

Configuring Windows 2000 PCs 11

Configuring Windows XP PCs 11

Chapter 6: Configuring the Router 13

Overview 13

Instructions 13

Chapter 7: Using The Router’s Web-based Utility 17

Overview 17

Navigating the Utility 17

Quick and Easy Administration 18

Basic Setup 19

DDNS 23

MAC Address Clone 24

Advanced Routing 25

Filter 26

VPN Passthrough 28

Port Range Forwarding 28

Port Triggering 29

EtherFast Cable/DSL Router with 8-Port Switch

UPnP Forwarding 30

DMZ 31

QoS 32

Management 33

Log 35

Factory Defaults 36

Firmware Upgrade 37

Router 37

Local Network 38

Appendix A: Troubleshooting 39

Common Problems and Solutions 39

Frequently Asked Questions 49

Appendix B: Upgrading Firmware 53

Appendix C: Finding the MAC Address and IP Address for Your

Ethernet Adapter 54

Windows 98 or Me Instructions 54

Windows 2000 or XP Instructions 54

For the Router’s Web-based Utility 55

Appendix D: Windows Help 56

Appendix E: Glossary 57

Appendix F: Specifications 63

Appendix G: Warranty Information 64

Appendix H: Regulatory Information 65

Appendix I: Contact Information 66

EtherFast Cable/DSL Router with 8-Port Switch

List of Figures

Figure 3-1: Back Panel 6

Figure 3-2: Front Panel 7

Figure 4-1: Example of a Typical Network 8

Figure 4-2: Connect a PC 9

Figure 4-3: Connect the Power 9

Figure 5-1: TCP/IP for Windows 98 and Me 10

Figure 5-2: Obtain an IP address automatically for Windows 98 and Me 10

Figure 5-3: Internet Protocol (TCP/IP) for Windows 2000 11

Figure 5-4: Obtain an IP address automatically for Windows 2000 11

Figure 5-5: Internet Protocol (TCP/IP) for Windows XP 12

Figure 5-6: Obtain an IP address automatically for Windows XP 12

Figure 6-1: Router’s IP Address for Basic Setup 13

Figure 6-2: Router Login for Basic Setup 13

Figure 6-3: Obtain an IP Automatically for Basic Setup 14

Figure 6-4: Static IP for Basic Setup 14

Figure 6-5: PPPoE for Basic Setup 15

Figure 6-6: RAS (for SingTel) for Basic Setup 15

Figure 6-7: PPTP for Basic Setup 16

Figure 6-8: Heart Beat Signal for Basic Setup 16

Figure 6-9: Router Registration for Basic Setup 16

Figure 7-1: Router’s IP Address 18

Figure 7-2: Router Login 18

Figure 7-3: Obtain an IP Automatically 19

Figure 7-4: Static IP 19

Figure 7-5: PPPoE 20

Figure 7-6: RAS (for Singtel) 20

Figure 7-7: PPTP 21

Figure 7-8: Heart Beat Signal 22

EtherFast Cable/DSL Router with 8-Port Switch

Figure 7-9: DDNS Disabled 23

Figure 7-10: DDNS Using DynDNS.org 24

Figure 7-11: DDNS Using TZO.com 24

Figure 7-12: MAC Clone 25

Figure 7-13: Advanced Routing 25

Figure 7-14: Routing Table 26

Figure 7-15: Filter 27

Figure 7-16: MAC Filter Setting 27

Figure 7-17: VPN Passthrough 28

Figure 7-18: Port Range Forwarding 28

Figure 7-19: Port Triggering 29

Figure 7-20: UPnP Forwarding 30

Figure 7-21: DMZ 32

Figure 7-22: QoS 32

Figure 7-23: Management 33

Figure 7-24: Log 35

Figure 7-25: Incoming Log Table 36

Figure 7-26: Outgoing Log Table 36

Figure 7-27: System Log 36

Figure 7-28: Factory Defaults 36

Figure 7-29: Firmware Upgrade 37

Figure 7-30: Router 37

Figure 7-31: Local Network 38

Figure 7-32: DHCP Active IP Table 38

Figure B-1: Upgrade Firmware 53

Figure C-1: IP Configuration Screen 54

Figure C-2: MAC Address/Adapter Address 54

Figure C-3: MAC Address/Physical Address 55

Figure C-4: MAC Address Filter 55

Figure C-5: MAC Address Clone 55

Chapter 1: Introduction

Welcome

EtherFast Cable/DSL Router with 8-Port Switch

Chapter 1: Introduction

Welcome

Thankyouforchoosing theEtherFast Cable/DSLRouter with8-Port Switch.This Routerwill allowyourcomputers

to share a high-speed Internet connection as well as resources, including files and printers.

How does the Router do all of this? By connecting your computers and peripherals to the Router and connecting

the Router to your cable or DSL modem, then the Router can direct and control communications for your network.

But what does all of this mean?

Networks are useful tools for sharing computer resources. You can access one printer from different computers

and access data located on another computer’s hard drive. Networks are even used for playing multiplayer video

games. So, networks not only are useful in homes and offices, but also can be fun.

PCs on a wired network create a LAN, or Local Area Network. They are connected with Ethernet cables, which is

why the network is called “wired”.

To create your network, install and set up the Router. To guide you through the process, Linksys strongly

recommends that you run the Setup Wizard on the Setup CD-ROM. If you prefer to manually set up the Router,

use the instructions in the Quick Installation or this User Guide to help you. These instructions should be all you

need to get the most out of the Router.

Ethernet: an IEEE standard network protocol

that specifies how data is placed on and

retrieved from a common transmission

medium.

LAN (Local Area Network): the computers

and networking products that make up the

network in your home or office.

Chapter 1: Introduction

What’s in this Guide?

EtherFast Cable/DSL Router with 8-Port Switch

What’s in this Guide?

This user guide covers the basic steps for setting up a network with a router. After going through “Chapter 3:

Getting to Know the Router,” most users will only need to use the following chapters:

• Chapter 4: Connecting the Router

This chapter instructs you on how to connect the cable or DSL modem to the Router and connect the PC(s) to

the Router.

• Chapter 5: Configuring the PCs

This chapter instructs you on how to configure your PC(s) for a DHCP connection, if the network settings are

not already set to DHCP.

• Chapter 6: Configuring the Router

This chapter explains how to configure the Router using your web browser and the Router’s Web-based

Utility. You will configure the Router using the settings provided by your ISP.

When you’re finished with the basic steps, then you are ready to connect to the Internet.

You also have other chapter available for reference:

• Chapter 1: Introduction

This chapter describes the Router’s applications and this User Guide.

• Chapter 2: Networking Basics

This chapter briefly explains how a network functions.

• Chapter 7: Using the Router’s Web-based Utility

This chapter describes the Web-based Utility and the features available, so you can use and alter advanced

configuration settings.

• Appendix A: Troubleshooting

This appendix describes some possible problems and solutions, as well as frequently asked questions,

regarding installation and use of the Router.

• Appendix B: Upgrading Firmware

This appendix explains how you can upgrade the Router’s firmware.

• Appendix C: Finding the MAC Address and IP Address for Your Ethernet Adapter

This appendix instructs you on how to find the MAC address or Ethernet address of your PC’s Ethernet

network adapter.

Chapter 1: Introduction

What’s in this Guide?

EtherFast Cable/DSL Router with 8-Port Switch

• Appendix D: Windows Help

This appendix describes how you can use Windows Help for instructions about networking, such as installing

the TCP/IP protocol.

• Appendix E: Glossary

This appendix gives a brief glossary of terms frequently used in networking.

• Appendix F: Specifications

This appendix provides the technical specifications for the Router.

• Appendix G: Warranty Information

This appendix supplies the warranty information for the Router.

• Appendix H: Regulatory Information

This appendix supplies the regulatory information regarding the Router.

• Appendix J: Contact Information

This appendix provides contact information for a variety of Linksys resources, including Technical Support.

Chapter 2: Networking Basics

An Introduction to LANs

EtherFast Cable/DSL Router with 8-Port Switch

Chapter 2: Networking Basics

An Introduction to LANs

Simply put, a router is a network device that connects two networks together.

TheRouterconnects yourlocal area network(LAN), orthe group of PCs inyour homeor office, tothe Internet. The

Router processes and regulates the data that travels between these two networks.

The Router’s Network Address Translation (NAT) technology protects your network of PCs so users on the Internet

cannot “see” your PCs. This is how your LAN remains private. The Router protects your network by inspecting the

first packet coming in through the Internet port before delivery to the final destination on one of the Ethernet

ports. The Router inspects Internet port services like the web server, ftp server, or other Internet applications,

and, if allowed, it will forward the packet to the appropriate PC on the LAN side.

The Use of IP Addresses

IP stands for Internet Protocol. Every device in an IP-based network, including PCs, print servers, and routers,

requires an IP address to identify its location, or address, on the network. This applies to both the Internet and

LAN connections.

There are two ways of assigning IP addresses to your network devices.

A static IP address is a fixed IP address that you assign manually to a PC or other device on the network. Since a

static IP address remains valid until you disable it, static IP addressing ensures that the device assigned it will

always have that same IP address until you change it. Static IP addresses are commonly used with network

devices such as server PCs or print servers.

If you use the Router to share your cable or DSL Internet connection, contact your ISP to find out if they have

assigned a static IP address to your account. If so, you will need that static IP address when configuring the

Router. You can get the information from your ISP.

A dynamic IP address is automatically assigned to a device on the network. These IP addresses are called

dynamic because they are only temporarily assigned to the PC or other device. After a certain time period, they

expire and may change. If a PC logs onto the network (or the Internet) and its dynamic IP address has expired, the

DHCP server will assign it a new dynamic IP address.

Dynamic IP address: a temporary IP

address assigned by a DHCP server.

Static IP address: a fixed address

assigned to a computer or device that

is connected to a network.

NAT (Network Address Translation):

NAT technology translates IP

addresses of a local area network to a

different IP address for the Internet.

DHCP (Dynamic Host Configuration

Protocol): a protocol that lets one

device on a local network, known as a

DHCP server, assign temporary IP

addresses to the other network

devices, typically computers.

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