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EtherFast Cable/DSL Routers
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Instant Broadband Series
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Your Router’s firewall (NAT) protects your network of PCs with security so
users on the public, Internet side cannot “see” your PCs.
This is how your
internal LAN, or network, remains private.
Remember that your Router’s ports connect to two sides: your 10/100
LAN
port(s) and the Internet
WAN
port.
The LAN port(s) transmit data at 10Mbps
or 100 Mbps, whereas the broadband port, or WAN port, transmits data at 10
Mbps, because 10Mbps is currently the maximum speed for cable and DSL
service.
IP Addressing: A Quick Lesson
What’s an IP Address?
IP
stands for Internet Protocol. Every
device on an IP-based network, including
PCs, print servers, and routers, requires an
IP address
to identify its “location,” or
address, on the network.
Since the Internet
is simply one huge global network, every
PC that logs on to the Internet also requires
an IP address.
There are two ways of assigning an IP
address to your network devices.
Static IP Addresses
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
insures that the device assigned it will always have that
same IP address.
Static IP addresses are commonly used with network devices
such as server PCs or print servers.
If you use your 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 your Router.
Connecting the Cable/DSL Router to
Your Network
Overview
Unlike a hub or a switch, the Cable/DSL Router’s setup consists of more than
simply plugging hardware together. Since the Router acts as a DHCP server,
you will have to set some values for the Router and also configure your net-
worked PCs to accept the IP addresses that the Router assigns them.
You will need the following data from your ISP (Internet Service Provider) to
install the Cable/DSL Router:
Your broadband-configured PCs’ Computer Name and Workgroup Name
Your broadband-configured PCs’ fixed
Internet IP Address
Your Subnet Mask
Your Default Gateway
Your Primary DNS Server IP address(es)
The installation technician from your ISP should have left this information with
you after installating your broadband connection. If not, you can call your ISP
to request the data.
Once you have the above values, you can begin the Installation and Setup of
your EtherFast Cable/DSL Router.
LANs and WANs
Simply put, a
router
is a network device that connects two networks together.
In this instance, your EtherFast Cable/DSL Router connects your
Local Area
Network (LAN)
, or the group of PCs in your home or office, to the
Wide Area
Network (WAN)
, that is, the Internet.
Your Router processes and regulates the
data that travels between these two networks.
Think of your Router as a network device with two sides:
the first side is made
up of your private
Local Area Network (LAN)
of PCs, which this User Guide
sometimes calls the “internal LAN.”
The other, public side is the Internet, or
the
Wide Area Network (WAN)
, outside of your home or office.
}
Only if applicable
Since your Router is a device that con-
nects 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 Router has firewall security
(NAT), the only IP address that can be
seen from the Internet for your net-
work is the Router’s WAN IP address.
However, even this WAN IP address
for the Router can be blocked, so that
your Router and network seem invisi-
ble to the Internet - see the
Blocking
WAN Requests
description under
IP
Filtering
.
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EtherFast Cable/DSL Routers
Connecting Your Hardware Together and Booting Up
1. Before you begin,
make sure that all of your hardware is powered off
,
including your Router, PCs, hubs, switches, and the cable or DSL modem.
2.
A. If you have the 4-Port Cable/DSL Router
, connect one end of a network
cable to one of the LAN ports (labeled
1
,
2
,
3
, or
4
) on the back of the
Router, and the other end into a standard port on a network device, e.g., a PC,
print server, hub, or switch.
See the
Twisted-Pair Cabling
section for
details on network cabling.
Repeat the above step to connect more PCs or network devices to the Router.
2.
B.
If you are connecting the 1-Port Router to just one PC
, plug one end
of a network cable into the Router’s
LAN
port and the other end into the PC’s
network adapter port.
Set the Crossover Switch to crossover mode (
X
).
If
the crossover mode does not light up a
Link
LED, see the chart in the
Getting to Know the 1-Port EtherFast Cable/DSL Router
section.
If you are connecting the 1-Port Router to a hub or switch
, plug one end
of a network cable into the Router’s
LAN
port, and the other end into to a
standard port on your network’s hub or switch.
Set the
LAN
port’s Crossover
Switch to its straight-through (
II
) mode.
Please refer to the chart in the
Getting to Know the 1-Port EtherFast Cable/DSL Router
section.
If your hub or switch has no more standard ports available
, connect the
Router using its
LAN
port to the
Uplink
port on the hub or switch.
Set the
Crossover Switch to straight-through mode (
II
) for this set-up.
2.
C.
If you have the 3-Port Cable/DSL Router
, connect one end of a net-
work cable from the one of the Router’s LAN ports (labeled
1
,
2
, or
3
) to a
port on a PC, hub, switch, or other network device.
The 3-Port Router features one USB plug-and-play port that connects
instantly to any USB-ready PC or hub.
This allows you to connect to and
access your Router without even installing any network cards.
A
standard port
is any port other than the WAN port
and the Uplink port.
It’s a straight-through port.
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Instant Broadband Series
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Dynamic IP Addresses
A
dynamic IP address
is automatically assigned to a device on the network,
such as PCs and print servers.
These IP addresses are called “dynamic”
because they are only
temporarily
assigned to the PC or device.
After a certain
time period, they expire and may change.
If a PC logs on to the network (or the Internet) and its dynamic IP address has
expired, the
DHCP server
will assign it a new dynamic IP address.
DHCP (Dynamic Host Configuration Protocol) Servers
PCs and other network devices using dynamic IP addressing are assigned a new
IP address by a
DHCP server
.
DHCP frees you from having to assign IP
addresses manually every time a new user is added to your network.
DHCP servers can either be a designated PC on the network or another network
device, such as the Cable/DSL Router.
By factory default, a DHCP server (LAN side) is enabled on your Router.
If
you already have a DHCP server running on your network, you
must
disable
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 your Router, see the section on DHCP in
The Cable/DSL
Router’s Web-based Utility
.
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 stat-
ic IP is not within DHCP range of the LAN IP Address.
If the dynamic IP addressing fails to provide a dynamic IP
address for any reason, please refer to the Troubleshooting
Section.
Page 13 / 45
3.
Connect the network cable
from your cable or DSL modem to the
WAN
port on your Router’s rear panel.
This is the only port that will work for your
modem connection.
4.
Connect the power adapter
to the
Power
port on the rear panel of the
Router, then plug the power adapter into a power outlet.
The
Power
LED on the front panel will light up green as soon as the power
adapter is connected properly.
The
Diag
LED will light up red for a few seconds when the Router goes
through its self-diagnostic test. This LED will turn off when the self-test
is complete.
5.
Power on the cable or DSL modem
.
6.
Press the Reset button
on the Router’s front panel with a paper clip or a
pencil.
Hold the button in until the
Diag
LED lights up and then turns off.
This will restore the Router’s factory default settings.
The Router’s hardware installation is now complete!
Continue with the next section to configure
the Router with your PCs.
Technical Checkpoint:
Did you remember to check for
Link
LEDs for all your connections?
If all of your
Link
LEDs are not lighting up, make sure that all your
cables are securely plugged in, and that all of your hardware is powered
on properly.
EtherFast Cable/DSL Routers
Uplinking: Connecting More Devices to Your Router
If your Router’s
LAN
ports are all full and you still have PCs and/or devices
to connect, connect a hub or a switch to your Router.
To do so, use the Router’s
Uplink
port to connect to a standard port on a hub
or switch.
If you have a PC/device connected to the port right next to the
Uplink
port (on the 3- and 4-Port Routers), disconnect that PC/device and
plug it into an open port on the new hub or switch.
Since the
Uplink
port shares internal wiring with the port right next to it, you
can only use only one of these two ports at a time: these ports are called
shared ports
.
If your new hub or switch also has an
Uplink
port, it too can be uplinked
when you next run out of ports, and so on.
Use the Router’s
Uplink
port to connect to a standard port on a hub or
switch.
This leaves you with new, open ports on the hub or switch, to which
you can add more PCs and/or network devices.
See your nearest Linksys retailer or visit
www.linksys.com
for complete
product lines of 10/100 Mbps hubs and switches.
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Instant Broadband Series
19
Note:
It is highly recommended that you plug your
Router into a power strip with surge protection.
Page 14 / 45
EtherFast Cable/DSL Routers
3.
Select “Search for the best driver for your device (Recommended).”
Click the
Next
button.
4. Select “Floppy disk drives” and click the
Next
button to start the search
for your driver.
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Instant Broadband Series
Configuring the BEFSRU31’s
USB Port
Use the enclosed USB cable to connect your PC to the Router: the Type A
end connects to your PC’s USB port, while Type B connects to the Router’s
USB port. Now that all of your Router’s hardware is connected together, you
must enable the PC that will connect to the Router through its USB port.
Since your USB connection acts as a network adapter for your PC, there’s no
need for you to install a network adapter for that PC.
Just follow the directions
below to enable your PC’s USB connection to the Router:
If you are running Windows 98, continue on this page, below.
For other Windows operating systems, please refer to the apropriate section
as listed in the Table of Contents.
You can also connect your Router’s USB port to other USB devices besides
USB-ready PCs, such as USB hubs.
USB Configuration for Windows 98
1. With the router connected to your PC’s USB port, start up your PC in
Windows 98 and insert the driver diskette.
2.
Windows will display a message saying that it has detected new hardware.
Click the
Next
button.
After you finish this configuration, make sure that TCP/IP is
installed on your PC(s).
For instructions on installing TCP/IP, see
the
Installing the TCP/IP Protocol
section in the Appendix.
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Page 15 / 45
EtherFast Cable/DSL Routers
7.
Windows will notify you that it has completed copying the driver files to
your PC.
Click the
Finish
button.
8. Windows will ask you if you want to restart your PC.
Click the
Yes
button
so your new installation will take effect.
If it does not ask you, click the
Start
button, select
Shut Down
, then select
Restart
and click the
Yes
button.
Your USB installation is now complete.
Go to the
Configuring Your Network with the
Cable/DSL Router
section to configure your
network to work with the Router.
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Instant Broadband Series
5.
A new window will appear, saying that Windows is now ready to install
the best driver for this device.
Click the
Next
button to continue.
6. Windows will begin copying the files to your PC.
Do not click the
Cancel
button or press the
Esc
key during this process.
If Windows asks for your Windows operating system files before copying,
direct your PC to the location of those files, e.g,
c:\windows\options\cabs
, or
D:\Win98
(assuming that your
CD-ROM drive is named D).
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