Linksys BEFSR41 - EtherFast Cable/DSL Router User manual

Instant Broadband™ Series
Cable/DSLRouters
Use this guide to install the following products:
BEFSR41 ver. 2 EtherFast Cable/DSL Router with 10/100 4-Port Switch
BEFSRU31 EtherFast Cable/DSL Router with USB Port and 10/100
3-Port Switch
BEFSR11 ver. 2 EtherFast 1-Port Cable/DSL Router
User Guide

COPYRIGHT & TRADEMARKS
Copyright © 2002 Linksys, All Rights Reserved. Instant Broadband is a trademark of
Linksys. Microsoft, Windows, and the Windows logo are registered trademarks of
Microsoft Corporation. All other trademarks and brand names are the property of their
respective proprietors.
LIMITED WARRANTY
Linksys guarantees that every Instant Broadband EtherFast Cable/DSL Router will be
free from physical defects in material and workmanship for one year from the date of pur-
chase, when used within the limits set forth in the Specifications section of this User
Guide. If the product proves defective during this warranty period, call Linksys Technical
Support in order to obtain a Return Authorization number. BE SURE TO HAVE YOUR
PROOF OF PURCHASE ON HAND WHEN CALLING. When returning a product, mark
the Return Authorization number clearly on the outside of the package and include a
copy of your original proof of purchase. RETURN REQUESTS CANNOT BE PROCESSED
WITHOUT PROOF OF PURCHASE. All customers located outside of the United States
of America and Canada shall be held responsible for shipping and handling charges.
IN NO EVENT SHALL LINKSYS’S LIABILITY EXCEED THE PRICE PAID FOR THE PROD-
UCT FROM DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAM-
AGES RESULTING FROM THE USE OF THE PRODUCT, ITS ACCOMPANYING SOFT-
WARE, OR ITS DOCUMENTATION. LINKSYS OFFERS NO REFUNDS FOR ITS PROD-
UCTS. Linksys makes no warranty or representation, expressed, implied, or statutory,
with respect to its products or the contents or use of this documentation and all accom-
panying software, and specifically disclaims its quality, performance, merchantability, or
fitness for any particular purpose. Linksys reserves the right to revise or update its prod-
ucts, software, or documentation without obligation to notify any individual or entity.
Please direct all inquiries to:
Linksys P.O. Box 18558, Irvine, CA 92623.
FCC STATEMENT
The Instant Broadband EtherFast Cable/DSL Router has been tested and complies with
the specifications for a Class B digital device, pursuant to Part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference
in a residential installation. This equipment generates, uses, and can radiate radio fre-
quency energy and, if not installed and used according to the instructions, may cause
harmful interference to radio communications. However, there is no guarantee that inter-
ference will not occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which is found by turning the equipment off
and on, the user is encouraged to try to correct the interference by one or more of the
following measures:
• Reorient or relocate the receiving antenna
• Increase the separation between the equipment or devices
• Connect the equipment to an outlet other than the receiver’s
• Consult a dealer or an experienced radio/TV technician for assistance
UG-BEFSR11/41/U31-021902D-JL

EtherFast
®
Cable/DSL Routers
Chapter 7: Configuring Your Network with the
Cable/DSL Router 34
Configuring PCs to Connect to the Cable/DSL Router 34
Configuring the Cable/DSL Router 36
Chapter 8: The Cable/DSL Router’s
Web-based Utility 39
Quick and Easy Router Administration 39
Setup 40
Password 45
Status 46
DHCP 47
Log 49
Security 50
Help 52
Advanced 53
IP Filtering 54
Port Range Forwarding 56
Dynamic Routing 61
Static Routing 62
DMZ Host 64
MAC Address Clone 65
Appendix A: Troubleshooting 66
Common Problems and Solutions 66
Frequently Asked Questions 79
Appendix B: Glossary 83
Appendix C: How to Ping Your ISP’s E-mail &
Web Addresses 96
Appendix D: Installing the TCP/IP Protocol 99
Appendix E: Twisted-Pair Cabling 101
Crimping Your Own Network Cables 102
Appendix F: Finding the MAC Address and IP
Address for Your Network Adapter 103
Instant Broadband™Series
Table of Contents
Chapter 1: Introduction 1
The Linksys EtherFast Cable/DSL Router 1
Features 1
Package Contents for the 4-Port Router (BEFSR41) 2
Minimum Requirements 2
Package Contents for the 1-Port Router (BEFSR11) 3
Minimum Requirements 3
Package Contents for the 3-Port Router (BEFSRU31) 4
Minimum Requirements 4
Chapter 2: Getting to Know the 4-Port
EtherFast Cable/DSL Router 5
The 4-Port Router’s Rear Panel 5
The 4-Port Router’s Front Panel LEDs 6
Chapter 3: Getting to Know the 1-Port
EtherFast Cable/DSL Router 8
The 1-Port Router’s Rear Panel 8
The 1-Port Router’s Front Panel LEDs 9
Chapter 4: Getting to Know the 3-Port
EtherFast Cable/DSL Router 11
The 3-Port Router’s Rear Panel 11
The 3-Port Router’s Front Panel LEDs 13
Chapter 5: Connecting the Cable/DSL Router
to Your Network 15
Overview 15
LANs and WANs 15
IP Addresses: A Quick Lesson 16
Connecting Your Hardware Together & Booting Up 18
Uplinking: Connecting More Devices toYour Router 20
Chapter 6: Installing the BEFSRU31’s USB
Port Drivers 21
Installing the Windows 98 Driver 21
Installing the Windows 2000 Driver 26
Installing the Windows Millennium Driver 30
Installing the Windows XP Driver 32

Instant Broadband™Series EtherFast
®
Cable/DSL Routers
Chapter 1:Introduction
The Linksys EtherFast®Cable/DSL Router
Congratulations on the purchase of the EtherFast Cable/DSL Router from
Linksys! The EtherFast Cable/DSL Router is the perfect solution for connect-
ing a network of PCs to a high-speed broadband Internet connection and to an
Ethernet network backbone. Configurable as a DHCP server for your network,
the EtherFast Cable/DSL Router is the only visible network device on the
Internet. The Router also serves as your Internet NAT firewall, protecting your
network’s PCs from being accessed by external users. All incoming data pack-
ets are monitored and filtered. The Router can also be configured to block
internal users’access to the Internet with IP filtering, as well as to play Internet
games, videoconference, and much more. Plus, the Router supports Universal
Plug and Play (UPnP), which allows Windows XP to automatically configure
the Router for various Internet applications, such as videoconferencing and
gaming—making the Router a snap to use.
Now all of your PCs can enjoy lightning-fast broadband Internet connections
and share internal network data. Link them all together and network faster than
you ever thought possible.
•Connects to a Cable/DSL Modem and to a 10/100 Network
•Supports Universal Plug and Play (UPnP)
•Equipped With a 3 or 4-Port 10/100 Switch (BEFSRU31 & BEFSR41 ver. 2
only)
•Connects Up to 253 PCs to the Internet with Just One WAN IP Address
•Configurable throughYour Web Browser
•Supports Single-Session IPSec and PPTP Pass-Through for Virtual Private
Network (VPN)
•Administer and Upgrade Your Router Remotely Over the Internet
•10/100 Switch Speeds Up Your Gaming and Multimedia Connections
(BEFSRU31 & BEFSR41 ver. 2 only)
•Configurable as a DHCP Server onYour Network
•Compatible with Virtually All Standard Internet Applications
•Administrators Can Set Up Port Filtering, Port Range Forwarding, MAC
Address Filtering, DMZ Hosting, and Much More
Appendix G: 4-Port Router Specifications 107
4-Port Environmental Specifications 107
Appendix H: 1-Port Router Specifications 108
1-Port Environmental Specifications 108
Appendix I: 3-Port Router Specifications 109
3-Port Environmental Specifications 109
Appendix J: Warranty Information 110
Appendix K: Contact Information 111
1
The Linksys EtherFast Cable/DSL Router
Features

EtherFast
®
Cable/DSL Routers
3
Instant Broadband™Series
2
Package Contents for the 1-Port Router (BEFSR11)
•One EtherFast 10/100 1-Port Cable/DSL Router
•One Power Adapter
•One User Guide
•One Setup Wizard CD-ROM
•One TechHelper CD-ROM (not shown)
•One Quick Installation and Registration Card (not shown)
•One External Cable or DSL Modem with Ethernet Port and Network Cable
(UTP CAT 5 RJ-45)
•TCP/IP Network Protocol with Ethernet Network Adapter and Cable (UTP
CAT 5 RJ-45) Per PC
•Internet Explorer 4.0 or Higher (5.5 Recommended), or Netscape Navigator
4.7 and higher
Package Contents for the 1-Port Router (BEFSR11)
•One EtherFast Cable/DSL Router with 10/100 4-Port Switch
•One Power Adapter
•One User Guide
•One Setup Wizard CD-ROM
•One TechHelper CD-ROM (not shown)
•One Quick Installation and Registration Card (not shown)
•One External Cable or DSL Modem with Ethernet Port and Network Cable
(UTP CAT 5 RJ-45)
•TCP/IP Network Protocol with Ethernet Network Adapter and Cable (UTP
CAT 5 RJ-45) Per PC
•Internet Explorer 4.0 or Higher (5.5 Recommended), or Netscape Navigator
4.7 and higher
Package Contents for the 4-Port Router (BEFSR41)
Minimum Requirements Minimum Requirements
Figure 1-1
Figure 1-2

EtherFast
®
Cable/DSL Routers
5
Instant Broadband™Series
4
Chapter 2:Getting to Know the
4-Port EtherFast®Cable/DSL
Router
Your Router’s ports, where network cables are connected, are located on the
rear panel of your Router.
WAN The WAN (Wide Area Network) port is where you
connect your RJ-45 Internet connection through a
cable or DSL modem. Your modem connection
will not work from any other port.
Ports 1-4 These four LAN (Local Area Network) ports con-
nect to network devices, such as PCs, print servers,
and remote hard drives. If Port 1is being used, the
Uplink port will not work because these two shared
ports have internally shared wiring.
Uplink The Uplink port is used to expand your network by
connecting to another switch or hub. Uplinking to a
switch or a hub is done by simply running a cable
from the Uplink port to the other device. See the
Uplinking: Connecting More Devices to the Router
section for more on uplinking.
If the Uplink port is being used, Port 1 will not
work.
Power The Power port is where you will connect the
power adapter.
•One EtherFast Cable/DSL Router with USB Port & 10/100 3-Port Switch
•One USB Cable
•One 3.5" Floppy Disk for USB Setup
•One Power Adapter
•One User Guide
•One Setup Wizard CD-ROM
•One TechHelper CD-ROM (not shown)
•One Quick Installation and Registration Card (not shown)
•One External Cable or DSL Modem with Ethernet Port and Network Cable
(UTP CAT 5 RJ-45)
•TCP/IP Network Protocol with Ethernet Network Adapter and Cable (UTP
CAT 5 RJ-45) Per PC
•Internet Explorer 4.0 or Higher (5.5 Recommended), or Netscape Navigator
4.7 and higher
Package Contents for the 3-Port Router (BEFSRU31)
Minimum Requirements
The 4-Port Router’s Rear Panel
Figure 1-3
Figure 2-1

EtherFast
®
Cable/DSL Routers
7
Instant Broadband™Series
6
The WAN Indicators
Link Green. The Link LED lights up when a successful connec-
tion is made between the Router and your broadband device
or network.
Act Green. The Act LED flickers when the Router is sending or
receiving data over the broadband WAN port (to the
Internet).
Diag Red. The Diag LED lights up when the Router goes through
its self-diagnosis mode during every boot-up. It will turn off
upon successful completion of the diagnosis.
If this LED stays on for an abnormally long period of time,
see “Appendix A: Troubleshooting.”
The Reset Button*
The Reset button can be used in one of two ways.
1. If your Router is having problems connecting to the Internet, press the Reset
button for just a moment with a paper clip or a pencil tip. This clears up any
jammed connections, and is similar to pressing the Reset button on your PC
to reboot it.
2. If you are experiencing extreme problems with your Router and have tried
all other troubleshooting measures, press the Reset Button and hold it down
until the red Diag LED on the front panel turns on and off completely.
This will restore factory defaults and clear all of the Router’s settings, includ-
ing the IP addresses you entered.
* The Reset Button is located on the front panel of the 4-Port Router, and the rear panels of the 3-
Port Router and the 1-Port Router.
Power Green.The Power LED lights up when the Router is powered
on.
Link/Act Green. The Link/Act LED serves two purposes. If the LED
is continuously lit, the Router is successfully connected to a
device through the corresponding port (1, 2, 3or 4). If the
LED is flickering, the Router is actively sending or receiving
data over that port. Port 1 is lit when using the Uplink port.
Full/Col Green. The Full/Col LED also serves two purposes. If this
LED is lit up continuously, the connection made through the
corresponding port is running in Full Duplex mode. If the
LED flickers, the connection is experiencing collisions.
Infrequent collisions are normal.
If this LED flickers too often, there may be a problem with
your connection. See “Appendix A: Troubleshooting” if you
encounter this problem.
100 Orange. The 100 LED lights up when a successful 100 Mbps
connection is made through the corresponding port.
If this LED does not light up, then your connection speed is
10 Mbps.
The 4-Port Router’s Front Panel LEDs
Figure 2-2

EtherFast
®
Cable/DSL Routers
9
Instant Broadband™Series
8
Buttons & Switches
The Reset Button Details on the Reset button are found in the
“Getting to Know the 4-Port EtherFast Cable/DSL
Router” section.
The Crossover Switch
When “uplinking,” or connecting two pieces of network hardware together,
such as a hub and a switch, a general rule of thumb is to plug one end of a
network cable into a straight-through port, and the other end into a crossover
port. Standard ports are straight-through ports, and uplink ports are crossover
ports.
The
1-
Port
Power Green. The Power LED lights up green when the Router is
powered on.
Important: The chart in Figure 3-2 is for reference purposes
only. Every network is different. If you do not make a connec-
tion to a hub or switch by using the settings above, change the
position of the Crossover Switch.
The 1-Port Router’s Front Panel LEDs
Chapter 3:Getting to Know the
1-Port EtherFast Cable/DSL
Router
The rear panel of the Router is where all of the Router’s cabling connections
are made, and where you can reset or configure the Router’s LAN port.
WAN The WAN (Wide Area Network) port is where you
connect your RJ-45 Internet connection through a
cable or DSL modem. Your modem connection
will not work from any other port.
LAN The LAN (Local Area Network) port is where you
connect your Router to a PC, hub, or switch. If you
have more than one PC, connect an Ethernet hub or
switch to your Router, and then connect your PCs to
that hub or switch.
Power The Power port is where you will connect the
power adapter.
The One-Port Router’s Rear Panel
Figure 3-1
Figure 3-2
Figure 3-3

EtherFast
®
Cable/DSL Routers
11
Instant Broadband™Series
Link/Act Green. The Link/Act LED serves two purposes. If the LED
is continuously lit, the Router is successfully connected to a
device through the LAN port. If the LED is flickering, the
Router is actively sending or receiving data through the LAN
port.
Full/Col Green. The Full/Col LED also serves two purposes. If this
LED remains lit, a LAN port connection is being successful-
ly maintained. If the LED flickers, the connection is experi-
encing collisions. Infrequent collisions are normal.
If this LED flickers too often, there may be a problem with
your connection. See “Appendix A: Troubleshooting” if you
encounter this problem.
10/100 Orange. The 10/100 LED lights up when a successful
100 Mbps connection is made through the corresponding
port.
If a connection is running at 10 Mbps, the 10/100 LED will
not light up.
The WAN Indicators
Link Green. The Link LED lights up when a successful connec-
tion is made between the Router and your broadband device
or network.
Act Green. The Act LED flickers when the Router is sending or
receiving data over the broadband WAN port.
Diag Red. The Diag LED lights up when the Router goes through
its self-diagnostic mode. It will turn off upon successful
completion of the diagnosis.
If this LED stays on for an abnormally long period of time,
see “Appendix A: Troubleshooting.”
10
Chapter 4:Getting to Know the
3-Port EtherFast Cable/DSL
Router
Ports 1-3 These three LAN ports connect to your PCs, hubs,
switches, print servers, or any other devices with an
Ethernet port.
Uplink The Uplink port connects to another hub or switch
for port expansion when you run out of open ports
for your network devices. Since the Uplink port and
the standard port right next to it share internal wiring,
you can only use one of the two ports at a time.
WAN The WAN (Wide Area Network) port is where you
connect your RJ-45 Internet connection through a
cable or DSL modem. Your modem connection
will not work from any other port.
Power The Power port is where you will connect the
power adapter.
USB The USB port (Type B - slave) can connect to a
USB-ready PC or a USB hub. This allows you to
enjoy an immediate, plug-and-play connection with-
out even installing a network adapter for your PC.
To work with USB ports, your PC must be running
Windows 98, 2000, Millennium, or XP.
The 3-Port Router’s Rear Panel Ports
Figure 4-1

EtherFast
®
Cable/DSL Routers
13
Instant Broadband™Series
12
Buttons
The Reset Button Details on the Reset button are found in the
“Getting to Know the 4-Port EtherFast Cable/DSL
Router” section.
Power Green. The Power LED lights up green when the Router is
powered on.
Link/Act Green. The Link/Act LED serves two purposes. If the LED
is continuously lit, the Router is successfully connected to a
device through the corresponding RJ-45 port (1, 2, or 3). If
the LED flickers, then that port is sending or receiving data
to and from the network.
Full/Col Green. The Full/Col LED also serves two purposes. If this
LED is continuously lit, the connection made through the
corresponding port is successfully running in Full Duplex
mode. If the LED is flickering, the connection is experien-
cing collisions. Infrequent collisions are normal.
If this LED flickers too often, there may be a problem with
your connection. See “Appendix A: Troubleshooting” if you
have problems.
100 Orange. The 100 LED lights up when a successful 100 Mbps
connection is made through the corresponding port. If this
LED does not light up, then your connection speed is
10 Mbps.
This USB icon denotes the presence of a USB port or connector.
Your 3-Port Router comes with a USB cable that has two different types of con-
nectors. TypeA, the master connector, is shaped like a rectangle and plugs into
your PC’s USB port. Type B, the slave connector, resembles a square and con-
nects to the USB port on the rear panel of your Router.
USB Compatibility with Your PC
To use the USB port on the 3-Port Router, you must have Windows 98, 2000,
Millennium, or XP installed on your PC. USB cannot run in a Windows 95 or NT
environment.
Also, your PC must have a USB port installed and enabled. Some PCs may have a dis-
abled USB port. If your port doesn’t seem to be working, there may be jumpers on the
motherboard or a menu option in the BIOS to enable a PC’s USB port.
Other motherboards have USB interfaces, but no ports. You can purchase and install
a USB-ready card at your local computer store. See your PC’s user guide for instruc-
tions.
USB Type A USB Type B
Important: USB ports do not work on PCs running
Windows 95 or Windows NT.
The 3-Port Router’s Front Panel LEDs
Figure 4-2
Figure 4-3
Figure 4-4