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EtherFast Cable/DSL Routers
Instant Broadband Series
46
in the command prompt.
To set the MAC filter, click the
Edit MAC Filter
Setting
button.
When a second window appears, select the range in the drop-
down box, and at the MAC number prompt, enter the 12-digit MAC address
you want to filter.
Click the
Apply
button and the
Continue
button, before
closing the window.
SPI (Stateful Packet Inspection)
This feature checks the state of of a packet to verify that the destination IP
address matches the source IP of the original request.
To use the firewall,
click the
Enable
button; otherwise select
Disable
to use the NAT firewall.
Blocking WAN Requests
By enabling the
Block WAN Request
feature, 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 difficult
for outside users to work their way into your network.
Click the
Apply
button and then the
Continue
button to save your changes.
Using Multicast Pass Through
This feature allows for mulitple transmissions to specific recipients at the
same time.
Select
Enable
to support the feature, or
Disable
to keep the router
from multicasting.
Using IPSec Pass Through
This feature lets you use IPSec Pass Through.
To use this feature, click on the
Enable
button next to “IPSec Pass Through,” then click on the
Apply
button.
To disable IPSec Pass Through, click on
Disable
and then click on the
Apply
button.
Using PPTP Pass Through
Point-to-Point Tunneling Protocol is the method used to enable VPN
(Virtual Private Networking) sessions.
To enable this feature, click on
Enable
next to PPTP Pass Through, and then click
Apply
.
To disable this feature, click on
Disable
next to PPTP Pass Through, and
then click the
Apply
button.
Using Remote Management
This feature allows you to manage your Router from a remote location, via the
Internet.
To enable this feature, click on
Enable,
then click the
Apply
but-
ton.
Remote Management must be activated before you leave to a remote
location.
To disable Remote Management, click on
Disable
, then click the
Apply
but-
ton. If you wish to use this feature on the browser, enter
http:\\<WAN IP
Address>:8080
.
45
IP Filtering
IP Filters block specific internal users from accessing the Internet and enable
VPN (Virtual Private Network) sessions. You can set up filters by using IP
addresses or network port numbers (or a range of ports).
Setting Up Filters
To set up a filter using IP addresses, enter the range of IP addresses you wish
to filter into the IP address fields. Users who have filtered IP addresses will
not be able to access the Internet at all.
If you only want to filter one IP
address instead of a range of IP addresses, enter the same value into both
fields.
For instance, if you wish to filter the PC with the IP address of
192.168.1.5, enter
5
into both fields on one line:
192.168.1.
5
~ 192.168.1.
5
.
Click the
Apply
button when you’re done.
To filter users by network port number, enter a network port number or a
range of network ports.
Enter the port numbers you want to filter into the port
numbers fields.
Users connected to the Router will no longer be able to
access any port number listed there.
Editing MAC Filter Setting
This feature filters the network adapter’s specific MAC address from going
out to the Internet.
To check your network adapter’s MAC address, run “
winipcfg
” or “
ipconfig
Note:
Only
one
VPN session may be conducted at a time.
Page 27 / 45
EtherFast Cable/DSL Routers
To add a server using Forwarding:
1.
Enter the port number or range of ports used by the server. On the same
line, select the protocol
UDP
,
TCP
, or
Both
, and enter the LAN IP address
of the server that you want the Internet user(s) to access.
2.
Configure as many entries as needed—the Router supports up to 10 ranges
of ports.
Click the
Apply
button when you’re done.
Using Port Triggering
Port triggering allows the Router to watch outgoing data for specific port num-
bers.
The IP address of the computer that sends the matching data is remem-
bered by the Router, so that when the requested data returns through the fire-
wall, the data is pulled back to the proper computer by way of IP address and
port mapping rules.
1.
Enter the application name of the trigger.
2.
Enter the port range used by the application.
3.
Enter the incoming port range used by the application.
4.
Click the
Apply
button to continue.
48
Instant Broadband Series
47
To disable this feature, click on
Disable
, then click the
Apply
button.
Using Remote Upgrade
This feature allows you to upgrade your Router’s firmware from a remote
location.
To enable Remote Upgrade, click on
Enable
, then click on the
Apply
button. Remote Management must be activated before you leave to a
remote location.
Using MTU (Maximum Transmission Unit)
This feature allows for the transmission of the largest packet size over the
network.
Select
Enable
and enter the value desired.
It is recommended that
you leave this value at the 1200 to 1500 range.
For most DSL users, it is rec-
ommended to use
1492
.
By default, MTU is set at
1500
when disabled.
Forwarding sets up public services on your network, such as web servers, ftp
servers, or email servers.
When users send this type of request to your net-
work via the Internet, the Router will forward those requests to the appropri-
ate PC.
Before using Forwarding, the Router's DHCP function must be dis-
abled under the DHCP tab and the Router must be assigned a new static LAN
IP address because the IP address may change when using the DHCP server.
IP Forwarding
Page 28 / 45
EtherFast Cable/DSL Routers
50
Instant Broadband Series
49
If your Cable/DSL Router is connected to more than one network, you may
have to set up a static route between the two networks. A static route is a pre-
determined pathway that network data packets must travel to reach a specific
host or network.
Click the
Show Routing Table
button to view the current
static routing configuration.
To create a static route entry:
Static Routing
With Dynamic Routing, you can automatically adjust to physical changes in
the network's layout. The Router, using the RIP protocol, calculates the most
efficient route for the network’s data packets to travel between the source and
the destination, based upon the shortest paths. The RIP protocol regularly
broadcasts routing information to other routers on the network.
To set up dynamic routing:
1.
Select the correct working mode.
Gateway Mode
should be used if your
Router is hosting your network's connection to the Internet.
Router Mode
should be selected if the Router exists on a network with other routers.
2. Select the
protocol
(TX) by which you transmit data on the network.
3. Select the
protocol
(RX) by which the Router receives network data.
4. Click the
Apply
button to save your changes.
Static Rou
Dynamic Routing
Page 29 / 45
EtherFast Cable/DSL Routers
52
Instant Broadband Series
51
DMZ Hosting
The DMZ Hosting feature allows one local user to be exposed to the Internet
to use a special-purpose service such as Internet gaming and video-conferenc-
ing.
Whereas IP Forwarding can only forward a maximum of 10 ranges of ports,
DMZ hosting forwards all the ports for one PC simultaneously.
To expose one PC, enter the computer’s IP address and click the
Apply
but-
ton.
Deactivate DMZ by entering a zero (
0
) in the field and clicking the
Apply
button.
1
. Select
Static Route Entry
from the drop-down list. The Cable/DSL Router
supports up to 20 static route entries.
2
.
Enter the following data to create a static route:
Destination LAN IP
The Destination LAN IP address is the Address of the
remote network or host to which you want to assign a static route. Enter the
IP address of the host for which you wish to create a static route here. If
you are establishing a route to an entire network, be sure that the network
portion of the IP address is set to zero (
0
).
For example, the Router’s standard IP address is 192.168.1.1. Based on this
address, the address of the network to which the Router is connected is
192.168.1, with the last digit (1, in this case) determining the Router’s place
on the network. Therefore, you would enter the IP address 192.168.1.0 if
you wanted to route to the Router’s entire network, rather than to just the
Router.
Subnet Mask
The Subnet Mask (also called the Network Mask) deter-
mines which portion of an IP address is the network portion and which por-
tion is the host portion. In the example above, the Network Mask is
255.255.255.0. This determines (by using the values 255) that the first
three numbers of an network IP address identify this particular network,
while the last digit (from 1 to 254) would identify the specific host.
Default Gateway
This IP address must be the IP address of the gateway
device that allows for contact between the Router and the remote network
or host.
Hop Count
This value gives the number of
nodes
that a data packet passes
through before reaching its destination.
A node is any device
on the network, such as switches, PCs, etc.
Interface
Interface tells you whether your network is on the LAN or the
WAN, or the Internet.
If you’re connecting to a sub- network, select
LAN
.
If you’re connecting to another network through the Internet, select
WAN
.
3
. Click the
Apply
button to save your changes.
Page 30 / 45
EtherFast Cable/DSL Routers
54
Instant Broadband Series
53
Troubleshooting
Common Problems and Solutions
This section provides possible solutions to problems regarding the installation
and operation of the Cable/DSL Router. Read below description to solve your
problems. If you can’t find an answer here, check the Linksys website at
www.linksys.com.
1. I can’t connect to the Cable/DSL Router.
• Check to see that the Cable/DSL Router is properly installed, the LAN
connections are OK (Link LEDs should be on), and it is powered ON.
• Make sure that your PC and the Router are on the same network segment.
If you are not sure, initiate the DHCP function and let the PC get the IP
address automatically.
• Make sure that your PC is using an IP address between 192.168.1.2 to
192.168.1.254 and thus compatible with the Cable/DSL Router default
IP address of 192.168.1.1.
• Also, the Subnet Mask must be set to 255.255.255.0 to match the
Cable/DSL Router’s Subnet Mask. You can check these settings for the
Router by going to
Start
and
Run
, then type in “
winipcfg
” and press
Enter
.
2. The Diag LED stays lit when it should not be lit.
• The
Diag
LED lights up when the Router is first powered up. Meantime,
the system will boot up itself and check for proper operation. After fin-
ishing the checking procedure, the LED turns off to show the system is
working fine. If the LED remains lit after this time, the device is not
working properly. Try to re-flash the firmware by assigning a static IP
address to the computer, then upgrade the firmware again. For example,
on one PC, use the following IP settings:
IP Adress: 192.168.1.50, Subnet: 255.255.255.0, Gateway: 192.168.1.1.
If that doesn’t help, contact your dealer for more information.
3. I can’t browse through the Cable/DSL Router.
Check if both ends of the network cable and power adapter are properly
connected. Check if the status LEDs on the front panel are functioning
properly.
If using Windows 95 or Windows 98, check the TCP/IP setup on the
client side. Run "
winipcfg
" by clicking on the
Start
button, then select-
ing
Run
. The PC should have an IP address of 192.168.1.xxx ("xxx" is
from 2 to 254.) Subnet Mask is 255.255.255.0, the default gateway IP
should be the Router’s IP Address, and DNS (in "More".)
MAC Address Clone
Clicking on the "MAC Address" tab (next to WAN IP Address) displays your
Router's
MAC address
, which is a 12-digit code assigned to a unique piece of
hardware for identification, like a social security number.
Some ISPs require
that you register the MAC address of your network card/adapter connected to
your cable or DSL modem during installation.
If your ISPs require MAC
address registration, find your adapter's MAC address by doing the following:
If you are running Windows 98:
Click the
Start
button, select
Run
, type in "
command
," and press the
Enter
key.
At the DOS prompt, type "
winipcfg
."
If you are running Windows 2000 or Millennium:
Click the
Start
button, select
Run
, type in "
command
," and press the
Enter
key.
At the DOS prompt, type "
ipconfig/all
."
The "Physical
Address" with 12 digits is your Router’s MAC address.
Enter those 12 digits into the fields below, and click the
Apply
button.
This “clones” your network adapter’s MAC address onto your Router,
and prevents you from having to call your ISP to change the registered
MAC address to the Router’s MAC address.
Note:
This is a
sample
screen.
Please enter
the MAC
Address for
your Network
Card/Adapter
into this field.

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