Linksys Instant Broadband Series User manual

Instant Broadband™ Series
EtherFast®
Cable/DSLRouters
Use this User Guide to install the following Linksys product(s):
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 registered
trademark of Linksys. Microsoft, Windows, and the Windows logo are registered trade-
marks of Microsoft Corporation. All other trademarks and brand names are the proper-
ty 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
purchase, when used within the limits set forth in the Specification section of this User
Guide. If the product proves defective during this warranty period, call Linksys
Customer 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’ 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
products, 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
interference 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/U31-011220C-JL

Instant Broadband™Series EtherFast
®
Cable/DSL Routers
Configuring Your Network with the
Cable/DSL Router 33
Configuring PCs to Connect to the Cable/DSL Router 33
Configuring the Cable/DSL Router 35
The Cable/DSL Router’s Web-based Utility 38
Quick and Easy Router Administration 38
Setup 39
Password 41
Status 42
DHCP 43
Log 44
Security 45
Help 47
IP Filtering 49
IP Forwarding 51
Dynamic Routing 53
Static Routing 54
DMZ Hosting 56
MAC Address Cloning 57
Troubleshooting 58
Common Problems 58
Frequently Asked Questions 60
Glossary 64
Appendix 77
How to Ping Your ISP’s E-mail & Web Addresses 77
Installing the TCP/IP Protocol 80
Twisted-Pair Cabling 82
Crimping Your Own Network Cables 83
4-Port Router Specifications 84
4-Port Environmental Specifications 84
1-Port Router Specifications 85
1-Port Environmental Specifications 85
3-Port Router Specifications 86
3-Port Environmental Specifications 86
Customer Support 87
Table of Contents
Introduction 1
The Linksys EtherFast Cable/DSL Router 1
Features 1
Package Contents for the 4-Port Router (BEFSR41) 2
System Requirements 2
Package Contents for the 1-Port Router (BEFSR11) 3
System Requirements 3
Package Contents for the 3-Port Router (BEFSRU31) 4
System Requirements 4
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
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
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
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
Installing the BEFSRU31’s USB Port Drivers 21
Installing the Windows 98 Driver 21
Installing the Windows 2000 Driver 25
Installing the Windows Millennium Driver 29
Installing the Windows XP Driver 31

EtherFast
®
Cable/DSL Routers
Package Contents for the 4-Port Router (BEFSR41)•One
•One EtherFast Cable/DSL Router with 10/100 4-Port Switch
•One Power Adapter
•One User Guide
•One Tech Helper CD-ROM
•One Quick Installation and Registration Card (not shown)
System Requirements
•One RJ-45 broadband Internet connection through a cable or DSL modem
•One PC with a 10 Mbps or 10/100 Mbps Ethernet card or adapter installed
•TCP/IP network protocol installed on each PC
•UTP CAT 5 network cables with RJ-45 connectors
•Internet Explorer 4.0 and higher or Netscape Navigator 4.0 and higher
(Version 5.5 for Internet Explorer and Version 4.7 for Netscape Navigator
highly recommended for optimal results)
2
Instant Broadband™Series
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, video-conference, and much more.
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.
Features
•Connect a Broadband Modem to an Ethernet Network Backbone
• Equipped With a 3 or 4-Port 10/100 Switch (BEFSRU31 & BEFSR41 ver. 2
only)
•Connects Up to 254 PCs to the Internet with Just One IP Address
•NAT Firewall Protects Your PCs From Outside Intruders on the Internet
•ConfigurableThrough a PC’s Web Browser Using Netscape Navigator 4.0 or
Internet Explorer 4.0 or Higher
•Supports IPSec Pass-Through for Virtual Private Networking (VPNs)*
•Administer 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 Block Specific Internal Users’ Internet Access
•DMZ Hosting Feature Enables Internet Multimedia Applications
Such as Video-Conferencing and Internet Gaming
*Limited IPSec Support
1

EtherFast
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Cable/DSL Routers
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Instant Broadband™Series
3
Package Contents for the 1-Port Router (BEFSR11)
Package Contents for the 1-Port Router (BEFSR11)
•One EtherFast 10/100 1-Port Cable/DSL Router
•One Power Adapter
•One User Guide
•One Tech Helper CD-ROM
•One Quick Installation and Registration Card (not shown)
System Requirements
•One RJ-45 broadband Internet connection through a cable or DSL modem
•One PC with a 10/100 Mbps Ethernet card or adapter installed
•TCP/IP network protocol installed on each PC
•UTP CAT 5 network cables with RJ-45 connectors
•One hub or switch for multiple computers
•Internet Explorer 4.0 and higher or Netscape Navigator 4.0 and higher
(Version 5.5 for Internet Explorer and Version 4.7 for Netscape Navigator
highly recommended for optimal results)
Package Contents for the 3-Port Router (BEFSRU31)
Pa
•One EtherFast Cable/DSL Router with USB Port & 10/100 3-Port Switch
•One USB Cable (not shown)
•One 3.5" Floppy Disk for USB Setup (not shown)
•One Power Adapter
•One User Guide
•One Tech Helper CD-ROM
•One Quick Installation and Registration Card (not shown)
System Requirements
•One RJ-45 broadband Internet connection through a cable or DSL modem
•One PC with a 10/100 Mbps Ethernet card or adapter installed, or a PC with
a USB port
•TCP/IP network protocol installed on each PC
•UTP CAT 5 network cables with RJ-45 connectors
•Internet Explorer 4.0 and higher or Netscape Navigator 4.0 and higher
(Version 5.5 for Internet Explorer and Version 4.7 for Netscape Navigator
highly recommended for optimal results)

EtherFast
®
Cable/DSL Routers
6
Instant Broadband™Series
5
4-Port Router’s Front Panel LEDs
The LAN Indicators
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.
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 the Troubleshooting section 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.
Getting to Know the 4-Port
EtherFast®Cable/DSL Router
The 4-Port Router’s Rear Panel
Your Router’s ports, where network cables are connected, are located on the
rear panel of your Router.
The 4-Port Router’s Ports
WAN The WAN (Wide Area Network) port is where you
connect your cable or DSL modem.
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.

EtherFast
®
Cable/DSL Routers
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Instant Broadband™Series
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Getting to Know the 1-Port
EtherFast Cable/DSLRouter
The One-Port Router’s Rear Panel
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.
The One-Port Router’s Ports
WAN The WAN (Wide Area Network) port is where you
connect your cable or DSL modem.
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 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 the Troubleshooting section.
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.

EtherFast
®
Cable/DSL Routers
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 the Troubleshooting section if you
encounter this problem.
10/100 Orange. The 10/100 LED lights up when a successful
100Mbps connection is made through the corresponding
port.
If a connection is running at 10Mbps, 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 the Troubleshooting section.
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Instant Broadband™Series
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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
The LAN Indicators
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
NNoottee::The diagram above 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

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. Type A, 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.
EtherFast
®
Cable/DSL Routers
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Instant Broadband™Series
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Getting to Know the 3-Port
EtherFast Cable/DSLRouter
The 3-Port Router’s Rear Panel Ports
The 3-Port Router’s Ports
Ports 1-3 These three LAN ports connect to your PCs, hubs,
switches, print servers, or any other device 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 This WAN port connects to your 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
without even installing a network adapter for your
PC. To work with USB ports, your PC must be run-
ning Windows 98, 2000, Millennium, or XP.
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 install your own USB
port and attach it to your PC’s motherboard using hardware purchased at retail com-
puter stores. See your PC’s User Guide for instructions.
USB Type A USB Type B
USB ports do not work on PCs running
Windows 95 or Windows NT.

EtherFast
®
Cable/DSL Routers
USB The USB LED lights up when the USB port is successfully
connected to a PC, USB hub, or other USB device.
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 the Troubleshooting section.
14
Instant Broadband™Series
Buttons
The Reset Button Details on the Reset button are found in the Getting
to Know the 4-Port EtherFast Cable/DSL Router
section.
The 3-Port Router’s Front Panel LEDs
The LAN Indicators
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 the Troubleshooting section if you
have problems.
100 Orange. The 100 LED lights up when a successful 100Mbps
connection is made through the corresponding port. If this
LED does not light up, then your connection speed is
10 Mbps.
13