Linksys Router BEFDSR41W User Manual

							Instant Broadband™  Series
ADSL GatewayModem / Router / 4-Port Switch / Wireless-ReadyUse this guide to install the following product:BEFDSR41W 
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 ADSL Gateway with Modem / Router  /
4-Port Switch / Wireless-Ready will be free from physical defects in material and work-
manship for one year from the date of purchase, 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 cus-
tomers located outside of the United States of America and Canada shall be held respon-
sible 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 PART 15 CLASS B STATEMENT
In compliance with the Federal Communications Commission (FCC), the following FCC
Part 15 Regulations are provided regarding the installation and operation of the Linksys
BEFDSR41W ADSL Gateway.
This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to Part 15 of the FCC Rules.  These limits are designed to provide rea-
sonable protection against harmful interference in a residential installation.
This equipment generates, uses and can radiate radio frequency energy and, if not
installed and used in accordance with 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 can be determined 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 and the receiver.
• Connect the equipment to an outlet on a circuit different from that to which the receiv-
er is connected.
• Consult a dealer or an experienced radio/TV technician for assistance.
This device complies with Part 15 of the FCC Rules.  Operation is subject to the follow-
ing two conditions:
• This device may not cause harmful interference.
• This device must accept any interference received, including interference that may
cause undesired operation.
FCC PART 68 STATEMENT
This equipment complies with Part 68 of the FCC Rules.  A label is attached to the equip-
ment that contains, among other information, its FCC registration number and ringer
equivalence number.  If requested, this information must be provided to the telephone
company.
This equipment uses the following USOC Jack: RJ-11.
An FCC compliant telephone cord and modular plug is provided with this equipment.
This equipment is designed to be connected to the telephone network or premises wiring
using a compatible modular jack, which is FCC Part 68 compliant. Connection to the
telephone network should be made by using the standard modular telephone jack.
The REN is useful to determine the quantity of devices that may be connected to the tele-
phone line and still have all of those devices ring when your telephone number is called.
In most, but not all areas, the sum of RENs should not exceed 5.  To be certain of the
number of devices that may be connected to the line, as determined by the total RENs,
contact the telephone company to determine the maximum REN for the calling area.
If this equipment causes harm to the telephone network, the telephone company may
discontinue your service temporarily.  If advance notice is not practical, the telephone
company will notify the customer as soon as possible.  Also, you will be advised of your
right to file a complaint with the FCC if you believe it is necessary.
The telephone company may make changes in its facilities, equipment, operations, or
procedures that could affect the operation of the equipment.  If this happens, the tele-
phone company will provide advance notice in order for you to make the necessary mod-
ifications in order to maintain uninterrupted service.
In the event this equipment should fail to operate properly, disconnect the unit from the
telephone line. Try using another FCC approved device in the same telephone jack.  If
the trouble persists, call the telephone company repair service bureau.  If the trouble
does not persist and appears to be with this unit, disconnect the unit from the telephone
line and discontinue use of the unit until it is repaired.  Please note that the telephone
company may ask that you disconnect the equipment from the telephone network until
the problem has been corrected or until you are sure that the equipment is not malfunc-
tioning. The user must use the accessories and cables supplied by the manufacturer to
get optimum performance from the product.
No repairs may be done by the customer. If trouble is experienced with this equipment,
please contact your authorized support provider for repair and warranty information.  If
the trouble is causing harm to the telephone network, the telephone company may
request you remove the equipment from the network until the problem is resolved.  This
equipment cannot be used on telephone company provided coin service.  Connection to
Party Line Service is subject to state tariffs.
SAFETY NOTICES
• Caution: To reduce the risk of fire, use only No.26 AWG or larger telecommunication
line  cord.
• Do not use this product near water, for example, in a wet basement or near a swim-
ming pool.
• Avoid using this products (other than a cordless type) during an electrical storm.
There may be a remote risk of electric shock from lightning.
UG-BEFDSR41W-071802NC-BW 
						

							ADSL Gateway with Modem / Router / 4-Port Switch / Wireless-ReadyFiltering 47
Forwarding 49
Dynamic Routing 51
Static Routing  53
DMZ Host 55
Firewall 56
Link Test 57
Appendix A: Troubleshooting  58
Common Problems and Solutions 58
Frequently Asked  Questions 60
Appendix B: Configuring Wireless Security  64
Conf iguring Wireless Security in Windows XP 68
Appendix C: Installing the TCP/IP Protocol 73
Appendix D: Finding the MAC Address and IP
Address for Your Ethernet Adapter 75
Appendix E: Specifications 79
Environmental Specif ications 80
Appendix F: Warranty Information 81
Appendix G: Contact Information 82
Instant Broadband
™Series
Table of ContentsChapter 1: Introduction 1
The Linksys ADSL Gateway 
with Modem / Router / 4-Port Switch / Wireless-Ready
1
Features 1
Package Contents 2
Minimum Requirements 2
An Introduction to LANs and WANs 2
IP Addresses 3
Network Setup Overview 5
Chapter 2: Getting to Know the ADSL Gateway
with Modem / Router / 4-Port Switch / Wireless-Ready
6
The Gateway’s Back Panel Ports 6
The Gateway’s Front Panel LEDs 7
Chapter 3: Connecting the Gateway 9
Chapter 4: Configuring the PCs 12
Overview 12
Windows 95, Windows 98, Windows Millennium 13
Windows 2000 15
Windows XP 17
Chapter 5: Configuring the Gateway 19
Chapter 6: Using the Gateway’s Web-based
Utility 25
Quick and Easy Gateway Administration 25
Setup 26
Password 34
Status 36
DHCP 38
Log 40
UPnP 41
Help 42
Wireless 44
Advanced 46 
						

							Instant Broadband
™Series
ADSL Gateway with Modem / Router / 4-Port Switch / Wireless-ReadyChapter 1: IntroductionThank you for choosing the Instant Broadband™  ADSL Gateway with Modem / Router / 4-
Port Switch / Wireless-Ready.  This Gateway allows you to set up a network with your PCs
and share your Internet connection.
The Gateway does this by connecting to your ADSL line, and using the Gateway’s Ethernet
ports to connect your PCs; it’s like each PC is connected directly to the Internet. This way, you
have an Ethernet network where you have several PCs utilizing one Internet connection simul-
taneously.  Plus, if you add a Linksys wireless PC Card, it can be used as an Access Point and
the Gateway can bridge your Ethernet network with your wireless PCs.
The PCs that you connect to the Gateway’s four LAN ports, when properly conf igured, cre-
ate a LAN, or Local Area Network.  They are connected with an Ethernet cable plugged into
your computer’s Ethernet adapter at one end and into one of the Gateways LAN ports (num-
bered from one to four) at the other end.  The term “Ethernet” is used to refer to your network
accessories, such as cables and adapters, because Ethernet refers to the type of network that
you are setting up. Ethernet refers to the accessories that transfer computer data from 10Mbps
to 100Mbps (speeds used by network devices.) 
The Gateway allows you to share your ADSL connection using a built-in ADSL modem, and
can plug directly into your ADSL-enabled wall jack (DSL service line).  The PCs that are con-
nected to the Gateway share this connection.•Download Speeds of up to 8Mbps 
•Upload Speeds of up to 800kbps
•Prevents DoS (Denial of Service) Attacks
•E-mail and Web-based Logging of Security Events
•MAC Address Filtering, Port Forwarding, DMZ Support
•Conf igurable through Your Networked PC’s Web Browser
•Supports VPN Pass-Through for IPSec, PPTP, and L2TP Protocols
•Internal 4-Port Switch Dramatically Speeds Up Your Network
•DHCP Server Capability to Assign IP Addresses Automatically
•Wireless Capabilities Available with Use of Optional WPC11 (sold separately)
•Supports a High Data Rate of up to 11Mbps for up to 28 Simultaneous
Wireless Connections 
•Capable of 64 and 128-Bit WEP Encryption
•Compliant with ANSI T1.413i2, ITU-T G.dmt (G.992.1), and ITU G.lite 
(G.992.2) Standards
•Supports RFC 1483, RFC 2364 PPPoA, RFC 2516 PPPoE Protocols
1
The Linksys ADSL Gateway 
with Modem / Router / 4-Port Switch / Wireless-Ready
Features 
						

							ADSL Gateway with Modem / Router / 4-Port Switch / Wireless-Ready
3
Think of the Gateway as a network device with two sides:  the f irst side is made
up of your private Local Area Network (LAN)of PCs.  The other, public side is
the Internet, or the Wide Area Network (WAN), outside of your home or off ice.
The Gateway’s f irewall (NAT) protects your network of PCs so users on the
public, Internet side cannot “see” your PCs.  This is how your LAN, or network,
remains private. The Gateway protects your network by inspecting the f irst
packet coming in through the WAN port before delivery to the f inal destination
on the LAN port. The Gateway inspects Internet port services like the web serv-
er, ftp server, or other Internet applications, and, if allowed, it will forward the
packet to the appropriate PC on the LAN side.
What’s an IP Address?
IPstands for Internet Protocol. Every device on an IP-based network, including
PCs, print servers, and routers, requires an IP addressto identify its “location,”
or address, on the network.  This applies to both the WAN and LAN connections.
There are two ways of assigning an IP address to your network devices. 
Static IP Addresses
A static IP addressis a f ixed 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 addressingensures that the device assigned it will always
have that same IP address until you change it.  Static IP addresses are com-
monly used with network devices such as server PCs or print servers.
When using the Gateway to share your ADSL Internet connection, contact your
ISP to f ind out if they have assigned a static IP address to your account. If so,
you will need that static IP address when conf iguring the Gateway. You can get
the information from your ISP.IP Addresses
Note:Since the Gateway is a device that connects two networks, it
needs two IP addresses—one for the LAN side, and one for the WAN
side.  In this User Guide, you’ll see references to the “WAN IP
address” and the “LAN IP address.”
Since the Gateway has f irewall security (NAT), the only IP address that
can be seen from the Internet for your network is the Gateway’s WAN
IP address.
However, even this WAN IP address for the Gateway can be blocked,
so that the Gateway and network seem invisible to the Internet—see
the IP Filtering section in “Chapter 6: Using the Gateway’s Web-based
Utility.”
Instant Broadband
™Series
2•One ADSL Gateway 
with Modem / Router / 4-Port Switch / Wireless-Ready
•One Power Adapter
•One RJ-11 Phone Cable
•One User Guide
•One Fast Start and Registration Card (not shown)
•Network Adapter with Ethernet (UTP CAT 5) Cabling and TCP/IP Protocol
Installed per PC
•Internet Explorer 4.0 or Netscape Navigator  4.7 or Higher for Web-based
Conf iguration
•ADSL Connection  and Activated Account
•Optional Wireless Network PC Card Model WPC11 for Wireless Connection
(sold separately)
Simply put, a routeris a network device that connects two networks together. 
In this instance, the Gateway connects your Local Area Network (LAN), or
the group of PCs in your home or off ice, to the Wide Area Network (WAN),
that is, the Internet.  The Gateway processes and regulates the data that travels
between these two networks.Minimum RequirementsPackage Contents
Figure 1-1
An Introduction to LANs and WANs 
						

							ADSL Gateway with Modem / Router / 4-Port Switch / Wireless-ReadyThis user guide covers the basic steps for setting up a network with a Gateway.
After going through the “Getting to Know the Gateway” chapter, most users
will only need to use the following chapters: 
•Chapter 3: Connecting the Gateway
This chapter instructs you on how to connect the ADSL line to the Gateway
and connect the PC(s) to the Gateway.
•Chapter 4: Conf iguring the PCs
This chapter instructs you on how to conf igure your PC(s) for a DHCP con-
nection, if the network settings are not already set to DHCP.
•Chapter 5: Conf iguring the Gateway
This chapter explains how to conf igure the Gateway using your web browser
and the Gateway’s web-based utility. You will conf igure the Gateway using
the settings provided by your ISP.
When you’re f inished with the basic steps, then you are ready to connect to the
Internet. After the PC(s) can access the Internet through the Gateway, you can
alter the Gateway’s settings further; for example, you can adjust security fea-
tures and other settings to enable online gaming, run Internet servers, conf ig-
ure a wireless LAN (WPC11 required) and more! 
5
Instant Broadband
™Series
Dynamic IP Addresses
A dynamic IP addressis automatically assigned to a device on the network,
such as PCs and print servers.  These IP addresses are called “dynamic”
because they are only temporarilyassigned to the PC or 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 serverwill assign
it a new dynamic IP address.
For ADSL users, many ISPs may require you to log on with a user name and
password to gain access to the Internet. This is a dedicated, high-speed con-
nection type called Point to Point Protocol over Ethernet (PPPoE). PPPoE is
similar to a dial-up connection, but PPPoE does not dial a phone number when
establishing a connection. PPPoE also will provide the Gateway with a dynam-
ic IP address to establish a connection to the Internet. Point to Point Protocol
over ATM, or PPPoA, is a similar login method also used for some ADSL con-
nections.
DHCP (Dynamic Host Configuration Protocol) Servers
DHCP frees you from having to assign IP addresses manually every time a new
user is added to your network. PCs and other network devices using dynamic
IP addressing are assigned a new IP address by a DHCP server. The PC or net-
work device obtaining an IP address is called the DHCP client.  By default, the
Gateway’s WAN setting is DHCP client.
A DHCP server can either be a designated PC on the network or another net-
work device, such as the Gateway. By default, a DHCP server (LAN side) is
enabled on the Gateway.  If you already have a DHCP server running on your
network, you mustdisable one of the two DHCP servers.  If you run more than
one DHCP server on your network, you will experience network errors, such as
conflicting IP addresses.  To disable DHCP on the Gateway, see the DHCP sec-
tion in “Chapter 6: Using the Gateway’s Web-based Utility.” 4
Note:Even if you assign a static IP address to a PC, other PCs can
still use DHCP’s dynamic IP addressing, as long as the static IP
address is not within the DHCP range of the LAN IP Address.
If the dynamic IP addressing fails to provide a dynamic IP address,
refer to “Appendix A: Troubleshooting.”
Network Setup Overview
Notebook with 
Ethernet Adapter
ADSL Gateway
with Modem / Router / 4-Port
Switch / Wireless-Ready
LAN
PC with 
Ethernet Adapter
WAN 
						

							ADSL Gateway with Modem / Router / 4-Port Switch / Wireless-Ready
7
Instant Broadband
™Series
6
PowerGreen. The PowerLED lights up when the Gateway is pow-
ered on.
DiagGreen. The DiagLED flashes when the Gateway is booting
up.  If this flashes or stays solid after the bootup phase, the
Gateway may be malfunctioning. See “Appendix A:
Troubleshooting” if you encounter this problem.
Link/ActGreen. The Link/ActLED serves two purposes. If the LED
is continuously lit, the Gateway is successfully connected to
a device through the corresponding port (1, 2, 3or 4). If the
LED is flickering, the Gateway is actively sending or receiv-
ing data over that port.
Full/ColGreen. The Full/ColLED 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. 
100 Green. The 100LED 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.
WLAN LinkGreen. This LED is solidly lit when a wireless PC Card is
inserted and functioning in the Gateway.
WLAN ActGreen. This LED flashes when there is wireless activity.The Gateway’s Front Panel LEDs
Figure 2-2
Chapter 2: Getting to Know the
ADSL Gateway 
with Modem / Router / 4-
Port Switch / Wireless-Ready
The Gateway’s ports, where network cables are connected, are located on the
back panel of the Gateway.
ADSLThe ADSLport is where you will connect your
ADSL line.
Ports 1-4These four LAN(Local Area Network) ports con-
nect to network devices, such as PCs, print servers,
and remote hard drives. 
PowerThe Powerport is where you will connect the
power adapter.  
On/Off SwitchThis switch is used for turning the Gateway on and
off.
PC Card SlotThis is where you can connect the optional wireless
PC card (not included) for wireless features.The Gateway’s Back Panel Ports
Figure 2-1 
						

							ADSL Gateway with Modem / Router / 4-Port Switch / Wireless-Ready
9
Instant Broadband
™Series
8
Chapter 3:Connecting the
Gateway You will connect the Gateway to your ADSL line and to the computers in your
home or business.
First, make sure that all the devices that you’ll be working with are powered
down, including your PCs and the Gateway.
1. Connect one end of the provided phone cable to the ADSL (RJ-11 phone)
port that is on the back of the Gateway.
2. Connect the other end of the phone cable to the wall jack with ADSL service. ADSL SessionGreen. This LED is solidly lit when a PPPoE session is estab-
lished.
ADSL LinkGreen. This LED is off when an ADSL line is not detected.
It flashes when the Gateway is attempting to make an ADSL
connection. The LED is solidly lit when an ADSL connection
has been successfully established.
ADSL ActGreen. This LED flashes when there is activity across the
ADSL connection.
Proceed to “Chapter 3: Connecting the Gateway.”Connecting Your Hardware and Booting Up
Figure 3-1Figure 3-2
The Reset Button
Briefly pressing the Reset Button or rebooting the Gateway will refresh the
Gateway’s connections. If the Gateway locks up, simply press the Reset Button
or power it down for three to f ive seconds. Leaving the power off for too long
could result in the loss of network connections.
Pressing the Reset Button and holding it in for a few seconds will clear all of
the Gateway’s data and restore the factory defaults. This should be done only
if you are experiencing heavy routing problems, and only after you have
exhausted all of the other troubleshooting options. By resetting the Gateway,
you run the risk of creating conflicts between your PCs’ actual IP Addresses
and what the Gateway thinks their IP Addresses should be. You may be forced
to reboot each network PC. 
						

							ADSL Gateway with Modem / Router / 4-Port Switch / Wireless-Ready
11
Instant Broadband
™Series
10
4. Connect the power adapter to the Gateway. Plug the power adapter into the
electrical outlet. 
5. Turn on the Gateway. Then, turn on the f irst PC that you want to use to con-
f igure the Gateway.
Go to “Chapter 4: Configuring the PCs.” 3. Connect one end of an Ethernet cable to your PC’s Ethernet adapter.  Connect
the other end of the cable to one of the LAN ports on the back of the Gateway.
Repeat this process for every PC that you want to connect to the Gateway.
Note: If your PC’s Ethernet adapter is not set up, please refer to the Ethernet
adapter’s user guide for more information.
If you are connecting more than four PCs to the Gateway, you will also need
to connect a hub or switch to the Gateway.
Figure 3-3Figure 3-4
Figure 3-5Figure 3-6
Note:The ADSL Gateway (with optional WPC11) is conf igured by
default to work out of the box with all Linksys Wireless Adapters. If
you have changed the defaults on your Linksys Wireless Adapters, or
are using other wireless adapters, you must temporarily change your
wireless adapter settings to: (SSID = linksys) in order to initially
access the Gateway wirelessly. After you have accessed the Gateway
with the default settings, you can change the Gateway settings to coin-
cide with your Network settings and reset your adapters.Note:A small device called a microf ilter (not included) may be nec-
essary between each phone and wall jack to prevent interference.
Contact your ISP if you have any questions.
Note:If you have a Linksys wireless PC Card (WPC11), be sure to
fully insert it into the PC Card slot on the back of the Gateway before
turning on the power.  You must have this card inserted in order to
use the Gateways wireless features.