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39
Setting Up: Advanced
Linksys E-Series
TIPS
An office network often has a wall plate with an Ethernet port that
you can connect to°
If you are doing this in a home environment (without wall ports),
connect an Ethernet network cable between a LAN port on your
upstream router and the
Internet
port on your Linksys router°
3.
Run Cisco Connect on each computer that you want to connect to
the Linksys router° Each computer needs either a wired or wireless
connection to the Linksys router° For more information, see “How to
connect a computer to your network” on page 16°
The computers that are connected to the Linksys router are now on the same
network, and are isolated from the upstream network° However, you will still
have access to the Internet through the upstream router (by way of your Linksys
router)° Because two routers are between your computer and the Internet,
Internet traffic undergoes two network address translations° This is sometimes
referred to as
Double NAT
°
Your computers can also use the built-in capabilities of your Linksys router,
such as parental controls° If you need further control over the type of content
your employees or family access, you can create an account with an Internet
filtering site such as
www.opendns.com
or
www.bsecure.com
° After you
create an account with them, use their DNS in place of your ISP’s DNS°
To use their DNS:
Setup > Basic Setup
1.
Log into the browser-based utility (see “How to open the browser-based
utility” on page 25)°
2.
Click the
Setup
tab, then click the
Basic Setup
page°
3.
Complete the
Static DNS
fields with the information provided by your
content filtering provider°
4.
Click
Save Settings
°
To extend your network
This topic covers cases three and four above.
NOTE
This is a complex process, so this procedure assumes that you have
some networking knowledge°
To extend your network or add wireless capabilities:
1.
If you want to extend your network, you may also follow the instructions
above° One example of this might be to provide a separate wireless
network for your children to keep their wireless network traffic separate
from your wireless network° You might also want to isolate one network
from another network so that network shares aren’t visible across
networks° In this case, use an Ethernet cable to connect the
Internet
port of the downstream router to one of the LAN ports of the upstream
router° Make sure that the local network subnets on the two routers are
different°
- OR -
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40
Setting Up: Advanced
Linksys E-Series
You can extend your network by turning the downstream router into an
access point° (See “How to use a router as an access point” on page 36)°
When you use a router as an access point, computers connected to the
access point are on the same IP subnet as all other devices connected to
the router° File, printer, and media sharing is much easier if all devices are
on the same subnet°
How to expose a device to the Internet
For
ALL
Why would I expose a device to the Internet?
If you are operating a web
server, a mail server, or a web camera, you may want to expose that device to
the Internet so anybody can access it° Your router includes a
DMZ
(Demilitarized
Zone) feature that forwards all inbound ports presented on the WAN interface,
except those that are specifically forwarded, to an individual IP address or
MAC address° This feature is normally not used, because it presents significant
security risks to the device that you designate for the DMZ° The DMZ device is
not protected by the built-in firewalls, Internet filters, or router web filters, and
is open to attacks from hackers°
A much better way of “exposing” devices to the Internet would be to use port
forwarding° See “How to set up port forwarding” on page 57°
To set up a device in the DMZ:
Applications & Gaming > DMZ
1.
Configure your device with a static IP address° See your device’s
documentation for help with setting a static IP address or use DHCP
reservation (see “How to set up the DHCP server on your router” on
page 29)°
2.
Log into the browser-based utility (see “How to open the browser-based
utility” on page 25)°
3.
Click the
Applications & Gaming
tab, then click the
DMZ
page°
4.
Select
Enabled
°
5.
In the
Source IP Address
section, select
Any IP Address
to allow access
to your DMZ device from the entire Internet, or select the
source range
button and enter a range of allowed source addresses°
6.
In the
Destination
section, enter the last three digits of the IP address of
the device that will be in the DMZ° The rest of the IP address is already
completed°
7.
Click
Save Settings
to apply your changes°
If you prefer to specify the 12-digit MAC address of the device you want
to place in the DMZ instead of setting up a DHCP address reservation,
you can replace Step 6 with the following steps:
a.
Click
Enabled
°
b.
In the
Source IP Address
section, select
Any IP Address
(default) to
allow access to your DMZ device from the entire Internet, or select the
source range
button and enter a range of allowed source addresses°
c.
In the
Destination
section, select
MAC Address
, then click
DHCP
Client Table
° A separate window opens showing the current DHCP
client list°
TIP
The DHCP Client Table is only available if you select
MAC Address
°
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41
Setting Up: Advanced
Linksys E-Series
d.
Click
Select
next to the device that you want to place in the DMZ° In
this example, the first device was selected° The corresponding MAC
address was copied into the
MAC Address
field as shown below°
e.
Click
Save Settings
to apply your changes°
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42
Improving Security
Linksys E-Series
42
How do I know if my network is secure?
For
ALL
If you configured your router using Cisco Connect, your network is secure°
During setup, Cisco Connect creates a name for your network, enables industry-
standard WPA/WPA2 wireless security, and assigns a highly secure password for
your wireless network and the administrator’s account°
To confirm that your network is secure:
1.
Run Cisco Connect°
2.
In the upper-right corner of the screen, check for the green light that
indicates your router is online and secure° If the green light is on, no
additional action is required to secure your network°
Network security following a manual
setup
For
ALL
If you configured your router manually (not recommended), you must manually
configure security°
To manually set your router’s password:
Administration > Management
1.
Log into the browser-based utility (see “How to open the browser-based
utility” on page 25)°
2.
Click the
Administration
tab, then click the
Management
page°
3.
In the
Router Access
section, enter a secure password for your router,
then re-enter the password to confirm it° Your password should be
at least eight characters in length° The most secure type of password
should include a mix of uppercase and lowercase letters, numbers, and
punctuation°
4.
Click
Save Settings
at the bottom of the screen°
To manually set your router’s network name (SSID):
Wireless > Wireless Settings
(E4200)
Wireless > Basic Wireless Settings (non-E4200)
1.
Log into the browser-based utility (see “How to open the browser-based
utility” on page 25)°
2.
Click the
Wireless
tab, then click the
Wireless Settings
page (for E4200
routers) or
Basic Wireless Settings
page (for non-E4200 routers)°
3.
For
Configuration View
, select
Manual
°
4.
Enter a new network name in the
Network Name (SSID)
field, then click
Save Settings
at the bottom of the screen°
Improving Security
Page 55 / 92
43
Improving Security
Linksys E-Series
To manually set your router’s wireless security settings:
Wireless > Wireless Settings (E4200)
Wireless > Wireless Security (non-E4200)
1.
Log into the browser-based utility (see “How to open the browser-based
utility” on page 25)°
2.
Click the
Wireless
tab, then click the
Wireless Settings
page (for E4200
routers) or
Basic Wireless Settings
page (for non-E4200 routers)°
3.
Select your preferred security type from the
Security Mode
drop-down
list For most home networks, we recommend
WPA2/WPA Mixed Mode
°
4.
Enter a passphrase (security key) for your wireless network in the
Passphrase
field° The most secure type of security key should include a
mix of uppercase and lowercase letters, numbers, and punctuation°
5.
Click
Save Settings
at the bottom of the screen°
How to set up wireless security using
Wi-Fi Protected Setup
For
ALL
Why would I use Wi-Fi Protected Setup?
Wi-Fi Protected Setup™ is a feature
of your router that makes it easy to add devices to your wireless network° If you
have network devices, such as wireless printers, that support Wi-Fi Protected
Setup, then you can use Wi-Fi Protected Setup to add the devices°
Wi-Fi Protected Setup activity light
The power indicator light on the back of the router (or on top for the E4200)
indicates the status of Wi-Fi Protected Setup while you are connecting devices°
When Wi-Fi Protected Setup is connecting a network device, the light
flashes slowly°
If there is an error, the light flashes quickly for two minutes° Wait until it
stops flashing, then try again°
When Wi-Fi Protected Setup has finished connecting a device, the light
is continuously lit °
Wait until the light is continuously lit before starting the next Wi-Fi
Protected Setup session°
Connect network devices using one of the three methods below°
NOTE
Wi-Fi Protected Setup configures one device at a time° Repeat the
instructions for each device that supports Wi-Fi Protected Setup°
Connecting a device using the Wi-Fi Protected Setup
button
Use this method if your device has a Wi-Fi Protected Setup button or prompts
you to press the Wi-Fi Protected Setup button on your router°
To connect a device using the Wi-Fi Protected Setup button:
Wireless > Basic Wireless Settings
1.
Press the
Wi-Fi Protected Setup
button on the network device you are
connecting to°
2.
Press the
Wi-Fi Protected Setup
button on the back of the router°
- OR -
a.
Log into the browser-based utility (see “How to open the browser-
based utility” on page 25)°
b.
Click the
Wireless
tab, then, if your router is not an E4200, click the
Basic Wireless Settings
page°
c.
Click
Wi-Fi Protected Setup
°
d.
Click the
Wi-Fi Protected Setup
button in the router’s
Wi-Fi Protected
Setup
screen°
e.
After the device has been configured, click
OK
°

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