Linksys BEFSR41 - EtherFast Cable/DSL Router Manuale utente

A Division of Cisco Systems, Inc.

Model No.

WIRED

BEFSR41 (EU/UK/LA)

User Guide

with 4-Port Switch

Cable/DSL Router

EtherFast

EtherFast Cable/DSL Router with 4-Port Switch

Specifications are subject to change without notice. Linksys and EtherFast are registered trademarks or

trademarks of their respective holders.

How to Use this Guide

Your guide to the EtherFast Cable/DSL Router with 4-Port Switch has been designed to make understanding

networking with the Router easier than ever. Look for the following items when reading this User 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.

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

BEFSR41_V4-UG-UK-41216NC KL

EtherFast Cable/DSL Router with 4-Port Switch

Chapter 1: Introduction 1

Welcome 1

What’s in this Guide? 2

Chapter 2: Networking Basics 4

An Introduction to Local Area Networks 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 Router 10

Overview 10

How to Access the Web-based Utility 11

The Setup Tab - Basic Setup 12

The Setup Tab - DDNS 18

The Setup Tab - MAC Address Clone 19

The Security Tab - Filter 22

The Security Tab - VPN 24

The Applications & Gaming Tab - Port Range Forwarding 25

The Applications & Gaming Tab - Port Triggering 26

The Applications & Gaming Tab - UPnP Forwarding 27

The Applications & Gaming Tab - DMZ 29

The Applications & Gaming Tab - QoS 30

The Administration Tab - Management 32

The Administration Tab - Log 34

The Administration Tab - Factory Defaults 35

The Administration Tab - Firmware Upgrade 36

The Status Tab - Router 37

The Status Tab - Local Network 38

Appendix A: Troubleshooting 39

Common Problems and Solutions 39

Frequently Asked Questions 49

Appendix B: Upgrading Firmware 53

EtherFast Cable/DSL Router with 4-Port Switch

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 62

Appendix G: Warranty Information 63

Appendix H: Regulatory Information and Safety 64

Appendix I: Contact Information 71

EtherFast Cable/DSL Router with 4-Port Switch

Figure 3-1: Back Panel 6

Figure 3-2: Front Panel 7

Figure 4-1: Example of a Typical Network 9

Figure 4-2: Connect a PC 9

Figure 4-3: Connect the Cable/DSL Modem 9

Figure 4-4: Connect the Power 9

Figure 5-1: Router’s IP Address 11

Figure 5-2: Router Login 11

Figure 5-3: Setup Tab - Basic Setup

(Obtain an IP automatically) 12

Figure 5-4: Static IP 13

Figure 5-5: PPPoE 13

Figure 5-6: RAS 14

Figure 5-7: PPTP 14

Figure 5-8: Heart Beat Signal 15

Figure 5-9: L2TP 16

Figure 5-10: Setup Tab - DDNS (DynDNS.org) 18

Figure 5-11: Setup Tab - DDNS (TZO.com) 18

Figure 5-12: Setup Tab - MAC Address Clone 19

Figure 5-13: Setup Tab - Advanced Routing 20

Figure 5-14: Routing Table Entry List 21

Figure 5-15: Security Tab - Firewall 22

Figure 5-16: MAC Filter Setting 22

Figure 5-17: Security Tab - VPN Passthrough 24

Figure 5-18: Applications & Gaming Tab -

Port Range Forwarding 25

Figure 5-19: Applications & Gaming Tab -

Port Triggering 26

Figure 5-20: Applications & Gaming Tab -

UPnP Forwarding 27

EtherFast Cable/DSL Router with 4-Port Switch

Figure 5-21: Applications & Gaming Tab - DMZ 29

Figure 5-22: Applications & Gaming Tab - QoS 30

Figure 5-23: Administration Tab - Management 32

Figure 5-24: Administration Tab - Log 34

Figure 5-25: Incoming Log Table 34

Figure 5-26: Outgoing Log Table 34

Figure 5-27: System Log 34

Figure 5-28: Administration Tab - Factory Defaults 35

Figure 5-29: Administration Tab - Firmware Upgrade 36

Figure 5-30: Status Tab - Router 37

Figure 5-31: Status Tab - Local Network 38

Figure 5-32: DHCP Client 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 Filtering 55

Figure C-5: MAC Address Clone 55

Chapter 1: Introduction

Welcome

EtherFast Cable/DSL Router with 4-Port Switch

Chapter 1: Introduction

Welcome

Thank you for choosing the EtherFast Cable/DSL Router with 4-Port Switch. This Router will allow your computers

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 Internet access and computer resources. Multiple computers can share

Internet access, so you don’t need more than one high-speed Internet connection. 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 4-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 Router to your cable or DSL modem, PCs, and peripherals,

such as a printer.

• Chapter 5: 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.

• 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.

• 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.

Chapter 1: Introduction

What’s in this Guide?

EtherFast Cable/DSL Router with 4-Port Switch

• 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 I: Contact Information

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

Chapter 2: Networking Basics

An Introduction to Local Area Networks

EtherFast Cable/DSL Router with 4-Port Switch

Chapter 2: Networking Basics

An Introduction to Local Area Networks

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

The Router connects your local area network (LAN), or the group of PCs in your home or office, to the 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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