Linksys Router BEFDSR41W User Manual

							ADSL Gateway with Modem / Router / 4-Port Switch / Wireless-Ready
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Bridged Mode OnlyChoose this option if your ISP told you to use this mode of encapsulation.
This mode is used to conf igure the Gateway as an RFC1483 bridge, when the
Gateway’s routing and NAT capabilities need to be disabled.
To apply any of the settings you change on a page, click the Applybutton, and
then click the Continuebutton.  To cancel any values you’ve entered on any
page, click the Cancelbutton. For more information on this tab, you can click
the Helpbutton.
Figure 6-10
RFC 2516 PPPoEChoose this option if your ISP told you to use this mode of encapsulation.
Use the User Name, Password, and Service Name (if applicable) provided by
your ISP.
1. Enter the Service Name(if provided) in the  f ield.
2. Enter the User Namein the Specify an IP Address f ield.
3. Enter the Passwordin the Password f ield.
4. Choose either Connect on Demandor Keep Aliveto determine how 
the Gateway will maintain your Internet connection during any period
of inactivity. If you have been disconnected due to inactivity, Connect
on Demand enables the Gateway to automatically re-establish your
connection as soon as you attempt to access the Internet again. You can
conf igure the Gateway to cut your connection with your ISP after a
specif ied period of time (Max Idle Time). The Keep Alive option keeps
your Internet access connected indef initely, even when it sits idle.
To apply any of the settings you change on a page, click the Applybutton, and
then click the Continuebutton.  To cancel any values you’ve entered on any
page, click the Cancelbutton. For more information on this tab, you can click
the Helpbutton.
Figure 6-9 
						

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• SNMP Trap CommunityEnter the password sent with each trap to the
SNMP manager.
• SNMP Trap DestinationEnter the IP address of the station that receives
the SNMP traps sent by the Gateway.
• Restore Factory DefaultsIf you select the Restore Factory Defaults option
and click the Applybutton, you will clear all of the Gateway’s settings. 
Do not restore the factory defaults unless you are having diff iculties with
the Gateway and have exhausted all other troubleshooting measures. Once
the Gateway is reset, you will have to re-enter all of your conf iguration data. 
To apply any of the settings you change on a page, click the Applybutton, and
then click the Continuebutton.  To cancel any values you’ve entered on any
page, click the Cancelbutton. For more information on this tab, you can click
the Helpbutton. On the Password screen, you can change the Gateway’s password, conf igure
SNMP settings, and restore the Gateway’s factory default settings.
• Router PasswordIt is stronglyrecommended that you set a password for
the Gateway. The default password is admin. If you don’t change the pass-
word, all users on your network will be able to access the Gateway using the
default password admin. Re-enter the new password in the second f ield.
• SNMP Get CommunitySet the read-only community string for SNMP. It
is strongly recommended to change this f ield to a name that cannot be eas-
ily guessed. The default string is public.
• SNMP Set CommunitySet the read/write community string for SNMP. It
is strongly recommended to change this f ield to a name that cannot be eas-
ily guessed. The default string is private.
• SNMP Trusted HostIf you enter a trusted host address here, the Gateway
will only respond to SNMP messages from this IP address. If you leave the
f ield blank (which is the default), the Gateway will respond to all SNMP
messages it receives, regardless of source.
Password
Figure 6-11 
						

							ADSL Gateway with Modem / Router / 4-Port Switch / Wireless-Ready• Downstream Speed  This indicates the maximum speed at which the ADSL
Gateway will receive data.  
• Login  This indicates the status of the PPPoA or PPPoE login (if applica-
ble).
• LANThese f ields display the current MAC Address, LAN IP Address, and
Subnet Mask of the Gateway, as seen by users on your local area network.
The status of the DHCP Server is also displayed, if applicable.
•WANThese f ields display the WAN IP Address, WAN Subnet Mask, and
WAN Default Gateway IP Address of the Gateway, as seen by external users
on the Internet. The DNS (Domain Name System) IP Address f ield(s) show
the IP address(es) of the DNS currently used by the Gateway. Multiple DNS
IP settings are common. In most cases, the f irst available DNS entry is
used.
• DHCP Clients Table   Click the DHCP Clients Tablebutton to view the list
of PCs that were given IP addresses by the Gateway.
DHCP
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This screen displays the current status of the Gateway; it reflects the data and
selections you’ve entered using the Setup screen and provides an option for
DHCP users.  
All of the information provided on this screen is read-only.  To make changes,
select the Setup tab.  
• Host NameThis f ield shows the name of the Gateway. 
• Firmware VersionThis f ield shows the installed version and date of the
f irmware.  Version dates are slightly more accurate than version numbers.
• Link Status  This indicates the status of the ADSL link. It tells you if the
ADSL Gateway is disconnected, attempting to connect, or connected.
• Upstream Speed  This indicates the maximum speed at which the ADSL
Gateway will transmit data. 
Figure 6-12
Status
Note:The information provided and buttons available may
vary depending on the Gateway’s settings.  
						

							ADSL Gateway with Modem / Router / 4-Port Switch / Wireless-Ready• Number of DHCP UsersEnter the maximum number of PCs that you want
the DHCP server to assign IP addresses to. This number cannot be greater
than 253.
• DHCP Clients Table  Click the DHCP Clients Tablebutton to show the
current DHCP Client data. You will see the MAC address, computer name,
and IP address of all network clients using the DHCP server. (This data is
stored in temporary memory and changes periodically.)
To apply any of the settings you change on a page, click the Applybutton, and
then click the Continuebutton.  To cancel any values you’ve entered on any
page, click the Cancelbutton. For more information on this tab, you can click
the Helpbutton.
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The Gateway can be set up as a DHCP (Dynamic Host Conf iguration Protocol)
server on your network. A DHCP server automatically assigns an IP address to
each PC on your network for you. Unless you already have one, it is highly rec-
ommended that you leave the Gateway enabled as a DHCP server.
If you choose to enable the DHCP server option, you must conf igure all of the
PCs on your LAN to connect to a DHCP server, or to obtain their IP addresses
automatically.  See “Chapter 4: Conf iguring the PCs” for more information.
If the Gateway’s DHCP server function is disabled, you have to carefully con-
f igure the IP address, Subnet Mask and DNS settings of every computer on
your network. Do not assign the same IP address to more than one computer.
• DHCP Server  DHCP is already enabled by factory default.  If you already
have a DHCP server on your network, set the Gateway’s DHCP option to
Disable.
• Starting IP AddressEnter a value for the DHCP server to start with when
issuing IP addresses.   DHCP
Figure 6-13 
						

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The Log tab provides you with a log of all incoming and outgoing URLs or IP
addresses for your Internet connection.  
• Access Log  To log incoming and outgoing traff ic, select the Enableoption
next to Access Log. This function can be disabled by clicking the Disable
radio button.
• Send Log to The log can be forwarded to the IP address of a specif ic com-
puter.
• Incoming Access Log and Outgoing Access Log  With logging enabled,
you can choose to view temporary logs. Temporary logs can be accessed
from the Log screen by clicking either the Incoming Access  Logor
Outgoing Access  Logbutton. The Incoming Access Log is a log of all the
Internet traff ic entering the Gateway on the ADSL side. The Outgoing
Access Log is a log of all traff ic entering the Gateway on the LAN side.
To clear any values you’ve entered on any page, click Canceland re-enter
information. To apply any settings you’ve altered on any page, click the Apply
button. Once all settings are correct, click Continue. For more information on
this tab, you can click the Helpbutton.
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Universal Plug and Play (UPnP) allows operating systems with UPnP support
to automatically detect and conf igure the Gateway. UPnP allows UPnP-enabled
applications, such as gaming and videoconferencing, to automatically manage
the Gateway. See your operating system’s documentation for instructions on
how to enable this feature on your system.
To clear any values you’ve entered on any page, click Canceland re-enter
information. To apply any settings you’ve altered on any page, click the Apply
button. Once all settings are correct, click Continue. For more information on
this tab, you can click the Helpbutton.UPnP
Figure 6-15
Log
Figure 6-14 
						

							ADSL Gateway with Modem / Router / 4-Port Switch / Wireless-ReadyTo upgrade the Gateway’s f irmware:
1. Select the Helptab (see Figure 6-16).
2. Click Upgrade Firmwareto display a new window (see Figure 6-17). 
3. Click the Browsebutton to f ind the f irmware upgrade f ile that you down-
loaded from the Linksys website and then extracted. 
4. Double-click thefirmware fileyou downloaded and extracted.  Click the
Upgradebutton, and follow the instructions there.
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Under the Help tab, you’ll f ind links to all of the Gateway’s internal support
documentation, including the application that upgrades the Gateway’s
f irmware. 
New f irmware versions are posted at www.linksys.comand can be downloaded
for free.  If the Gateway can access the Internet already, there’s no need to
download a newer f irmware version, unless that version has a new feature that
you want to use.  Loading new f irmware onto the Gateway does not enhance
the speed or the quality of your connection speed.  
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Help
Figure 6-16
Figure 6-17
Note:By upgrading the Gateway’s f irmware, you may lose the Gateway’s
conf iguration settings. 
						

							ADSL Gateway with Modem / Router / 4-Port Switch / Wireless-ReadyOn the WEP Key Setting screen, you can make the following choices:
•Select 64- or 128-bit WEP encryption.
•Select Passphrase generation for easy setup of encryption f ields.
•Conf igure the manual entry of WEP encryption keys.
•Conf igure the default transmit WEP key.
• Firmware Version   The wireless card’s f irmware version is listed in this
f ield. 
• RTS Threshold.This value should remain at its default setting of 2432.
Should you encounter inconsistent data flow, only minor modif ications are
recommended.
• Fragmentation Threshold.This value should remain at its default setting
of 2432. It specif ies the maximum size a data packet will be before split-
ting and creating a new packet. A smaller setting means smaller packets,
which will create more packets for each transmission. Only minor modif i-
cations of this value are recommended.
To clear any values you’ve entered on any page, click Canceland re-enter
information. To apply any settings you’ve altered on any page, click the Apply
button. Once all settings are correct, click Continue. For more information on
this tab, you can click the Helpbutton.
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Use the Wireless screen to conf igure the Gateway for your wireless network.
• SSID  The Service Set Identif ier (SSID) is the unique name shared among
all clients and access points in a wireless network. The SSID must be iden-
tical for all clients and access points participating in the same network. The
SSID is case-sensitive and must not exceed 30 characters. 
For security reasons, it is recommended that you change the SSID from the
default “linksys”, and avoid common names (e.g. Company name).
• Channel  This specif ies the channel (frequency) used for the wireless net-
work. Select the appropriate channel to correspond with your network set-
tings, between 1 and 11 (in North America). All points in your wireless net-
work must use the same channel in order to function correctly.
• WEP  The WEP Encryption method is Disabledby default. To enable
WEP, click the Mandatoryradio button. Click the WEP Key Settingbut-
ton to conf igure the WEP key settings. 
Figure 6-18
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Wireless
Note:For further details on conf iguring wireless security using WEP,
refer to “Appendix B: Conf iguring Wireless Security.”
Note:You must insert the Linksys wireless PC card in the PC card slot on
the back of the Gateway before you can use the wireless features. 
						

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The following instructions are for advanced users or users whose setup needs
require special conf iguration. When you click the Advanced tab, you will be
able to set up these features. There are seven additional tabs available. 
•Filters - Block specif ic internal users from Internet access and enable Virtual
Private Network (VPN) sessions.
•Forwarding - Sets up public services on your network.
•Dynamic Routing - Sets up the Gateway so it will automatically adjust to
physical changes in the network’s layout.
•Static Routing - Sets up static routes needed when network information must
travel to a specif ic host or network.
•DMZ Host - Allows one local user to be exposed to the Internet for use of
special-purpose services such as online gaming or videoconferencing.
•Firewall - Allows the Gateway to use Stateful Packet Inspection (SPI) to auto-
matically detect and block Denial of Service (DoS) and hacking attempts.
•Link Test - Allows an advanced user or technician to perform advanced diag-
nostics of the ADSL Gateway and perform connectivity tests.
Filters block specif ic internal users from accessing the Internet and enable
Virtual Private Network (VPN) sessions. You can set up f ilters by using IP
addresses, network port numbers (or a range of ports), or MAC addresses.
Setting Up Filters
• Filtered Private IP RangeTo set up a f ilter using IP addresses, enter the
range of IP addresses you wish to f ilter in the IP address f ields. Users who have
f iltered IP addresses will not be able to access the Internet at all. If you only
want to f ilter one IP address instead of a range of IP addresses, enter the same
value into both f ields.
Advanced
Filtering
Important:This is an Advanced Function.  No changes should be made
to this tab without a thorough understanding of network concepts.
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Figure 6-19 
						

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Port Range Forwarding sets up public services on your network, such as web
servers, ftp servers, e-mail servers, or other specialized Internet applications.
(Specialized Internet applications are any applications that use Internet access
to perform functions such as videoconferencing or online gaming. Some
Internet applications may not require any forwarding.) When users send this
type of request to your network via the Internet, the Gateway will forward those
requests to the appropriate PC. 
You may use this feature to establish a web server or FTP server for Internet
users to access. Be sure that you enter a valid IP address; you may need to
establish a static IP address with your ISP in order to properly run an Internet
server. For added security, Internet users will be able to communicate with the
server, but they will not actually be connected. The packets will be forwarded
through the Gateway instead. If you need to forward all ports to one PC, see the
“DMZ” section.Forwarding
Important:This is an Advanced Function.  No changes should be made
to this tab without a thorough understanding of network concepts.
• Filtered Private Port RangeTo f ilter users by network port number, enter a
network port number or a range of network ports. Select the protocol for each
port number you want to f ilter, TCP or UDP. Enter the port numbers you want
to f ilter in the port numbers f ields. Users connected to the Gateway will no
longer be able to access any port number listed there. 
Private MAC Filter
•Click the Edit MAC Filter Settingbutton to f ilter users by entering their
physical addresses.  
In the MAC Filter Setting screen, enter the MAC addressesthat you want to
f ilter in the MAC address f ields. The users with the f iltered MAC addresses
will not be able to access the Internet. Click the Applybutton and the
Continuebutton, before closing the window. 
Block WAN Requests
•This feature is designed to protect users from Internet hackers and other
attacks. When enabled, the Gateway will ignore both unknown TCP and
ICMP packets from the WAN side. By enabling the Block WAN Request fea-
ture, you can prevent your network from being “pinged,” or detected, by other
Internet users. The Block WAN Request feature also reinforces your network
security by hiding your network ports. Both functions of the Block WAN
Request feature make it more diff icult for outside users to work their way into
your network.
Remote Management
•This feature allows you to manage or conf igure the Gateway from a remote
location, via the Internet. To enable management through the WAN connec-
tion, click Enable, and use port 8080 on the remote PC you are using for
remote management. 
Remote Upgrade 
•This feature allows you to upgrade the Gateway’s f irmware from a remote
location.  To enable Remote Upgrade, click Enable.
Telnet Configuration
•This feature enables or disables telnet access to the Gateway.
To clear any values you’ve entered on any page, click Canceland re-enter
information. To apply any settings you’ve altered on any page, click the Apply
button. Once all settings are correct, click Continue. For more information on
this tab, you can click the Helpbutton.
Figure 6-20 
						

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With Dynamic Routing you can enable the Gateway to automatically adjust to
physical changes in the network’s layout. The Gateway, using the RIP protocol,
determines the network packets’ route based on the fewest number of hops
between the source and the destination. The RIP protocol regularly broadcasts
routing information to other routers on the network. Select the RIP directions
and versions for the LAN and WAN sides.
RIP Direction
Determines the direction that RIP routes will be updated.
• NoneRIP is disabled.
• BothThe Gateway will incorporate received RIP information and send out
updated RIP information.
• In OnlyThe Gateway will only incorporate received RIP information.
• Out OnlyThe Gateway will only send out RIP information.Dynamic Routing
Figure 6-21
Important:This is an Advanced Function.  No changes should be made
to this tab without a thorough understanding of network concepts.
To add a server using Port Range Forwarding:
1. Enter the nameof the application in the appropriate Customized
Applications f ield.  This f ield is a description f ield only.
2.  Next to the name of the application, enter the rangeof the external port(s)
used by the server or Internet application in the Ext. Port column. Check
with the Internet application software documentation for more information.
3. Enter the IP addressof the server that you want the Internet users to be
able to access.  To f ind the IP address, go to “Appendix D: Finding the
MAC Address and IP Address for Your Ethernet Adapter.”
4.  Conf igure as many entries as needed—the Gateway supports up to 11
ranges of ports. Click the Applybutton and Continuebutton when you are
done. 
To delete a server entry, enter 0in the Ext. Port and IP Address f ields.
To clear any values you’ve entered on any page, click Canceland re-enter
information. To apply any settings you’ve altered on any page, click the Apply
button. Once all settings are correct, click Continue. For more information on
this tab, you can click the Helpbutton.