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Chapter±2
Wireless Security Checklist
4
W±reless-N Broadband Router
Chapter 2:
W±reless Secur±ty Checkl±st
Wireless networks are convenient and easy to install, so
homes with high-speed Internet access are adopting them
at a rapid pace. Because wireless networking operates by
sending information over radio waves, it can be more
vulnerable to intruders than a traditional wired network.
Like signals from your cellular or cordless phones, signals
from your wireless network can also be intercepted. Since
you cannot physically prevent someone from connecting
to your wireless network, you need to take some additional
steps to keep your network secure.
1. Change the default w±reless
network name or SSID
Wireless devices have a default wireless network name
or Service Set Identifier (SSID) set by the factory. This
is the name of your wireless network, and can be up
to 32 characters in length. Linksys wireless products
use
l±nksys
as the default wireless network name. You
should change the wireless network name to something
unique to distinguish your wireless network from other
wireless networks that may exist around you, but do not
use personal information (such as your Social Security
number) because this information may be available for
anyone to see when browsing for wireless networks.
2. Change the default password
For wireless products such as access points and routers,
you will be asked for a password when you want to change
their settings. These devices have a default password set
by the factory. The Linksys default password is
adm±n
.
Hackers know these defaults and may try to use them
to access your wireless device and change your network
settings. To thwart any unauthorized changes, customize
the device’s password so it will be hard to guess.
². Enable MAC address f±lter±ng
Linksys routers give you the ability to enable Media Access
Control (MAC) address filtering. The MAC address is a
unique series of numbers and letters assigned to every
networking device. With MAC address filtering enabled,
wireless network access is provided solely for wireless
devices with specific MAC addresses. For example, you can
specify the MAC address of each computer in your home
so that only those computers can access your wireless
network.
4. Enable encrypt±on
Encryption protects data transmitted over a wireless
network. Wi-Fi Protected Access (WPA/WPA2) and Wired
Equivalency Privacy (WEP) offer different levels of security
for wireless communication.
A network encrypted with WPA/WPA2 is more secure
than a network encrypted with WEP, because WPA/WPA2
uses dynamic key encryption. To protect the information
as it passes over the airwaves, you should enable the
highest level of encryption supported by your network
equipment.
WEP is an older encryption standard and may be the
only option available on some older devices that do not
support WPA.
General Network Security Guidelines
Wireless network security is useless if the underlying
network is not secure.
Password protect all computers on the network and
individually password protect sensitive files.
Change passwords on a regular basis.
Install
anti-virus
software
and
personal
firewall
software.
Disable file sharing (peer-to-peer). Some applications
may open file sharing without your consent and/or
knowledge.
Additional Security Tips
Keep wireless routers, access points, or gateways away
from exterior walls and windows.
Turn wireless routers, access points, or gateways
off when they are not being used (at night, during
vacations).
Use strong passphrases that are at least eight characters
in length. Combine letters and numbers to avoid using
standard words that can be found in the dictionary.
WEB:
For
more
information
on
wireless
security, visit
www.l±nksys.com/secur±ty
Page 7 / 38
Chapter±3
Advanced Configuration
³
W±reless-N Broadband Router
Chapter ²:
Advanced Conf±gurat±on
After setting up the Router with the Setup Wizard (located
on the CD-ROM), the Router will be ready for use. However,
if you’d like to change its advanced settings, use the
Router’s web-based utility. This chapter describes each
web page of the utility and each page’s key functions. You
can access the utility via a web browser on a computer
connected to the Router.
The web-based utility has these main tabs: Setup,
Wireless, Security, Access Restrictions, Applications &
Gaming, Administration, and Status. Additional tabs will
be available after you click one of the main tabs.
NOTE:
When first installing the Router, you
should use the Setup Wizard on the Setup
CD-ROM. If you want to configure advanced
settings, use this chapter to learn about the
web-based utility.
How to Access the Web-Based Utility
To access the web-based utility, launch the web browser on
your computer, and enter the Router’s default IP address,
192.168.1.1
, in the
Address
field. Then, press
Enter
.
A login screen will appear. (Non-Windows XP users will
see a similar screen.) Leave the
User name
field blank. The
first time you open the Web-based utility, use the default
password
adm±n
. (You can set a new password from the
Administration tab’s
Management
screen.) Click
OK
to
continue.
Login Screen
Setup > Basic Setup
The first screen that appears is the
Basic Setup
screen. This
allows you to change the Router’s general settings.
Setup > Basic Setup
Internet Setup
The Internet Setup section configures the Router to your
Internet connection. Most of this information can be
obtained through your ISP.
Internet Connection Type
Select the type of Internet connection your ISP provides
from the drop-down menu. These are the available types:
Automatic Configuration - DHCP
Static IP
PPPoE
PPTP
L2TP
Telstra Cable
Automatic Configuration - DHCP
By default, the Router’s Internet Connection Type is set
to
Automat±c Conf±gurat±on - DHCP
, which should be
kept only if your ISP supports DHCP or you are connecting
through a dynamic IP address. (This option usually applies
to cable connections.)
Internet Connection Type > Automatic Configuration - DHCP
Page 8 / 38
Chapter±3
Advanced Configuration
6
W±reless-N Broadband Router
Static IP
If you are required to use a permanent IP address to
connect to the Internet, select
Stat±c IP
.
Internet Connection Type > Static IP
Internet IP Address
This is the Router’s IP address, when
seen from the Internet. Your ISP will provide you with the
IP Address you need to specify here.
Subnet Mask
This is the Router’s Subnet Mask, as seen
by users on the Internet (including your ISP). Your ISP will
provide you with the Subnet Mask.
Default Gateway
Your ISP will provide you with the IP
address of the ISP server.
DNS 1-²
Your ISP will provide you with at least one DNS
(Domain Name System) server IP address.
PPPoE
Some DSL-based ISPs use PPPoE (Point-to-Point Protocol
over Ethernet) to establish Internet connections. If you are
connected to the Internet through a DSL line, check with
your ISP to see if they use PPPoE. If they do, you will have
to enable
PPPoE
.
Internet Connection Type > PPPoE
Username and Password
Enter the Username and
Password provided by your ISP.
Serv±ce Name
If provided by your ISP, enter the Service
Name.
Connect on Demand: Max Idle T±me
You can configure
the Router to cut the Internet connection after it has been
inactive for a specified period of time (Max Idle Time). If
your Internet connection has been terminated due to
inactivity, Connect on Demand enables the Router to
automatically re-establish your connection as soon as you
attempt to access the Internet again. To use this option,
select
Connect on Demand
. In the
Max Idle Time
field,
enter the number of minutes you want to have elapsed
before your Internet connection terminates. The default
Max Idle Time is
minutes.
Keep Al±ve: Red±al Per±od
If you select this option,
the
Router
will
periodically
check
your
Internet
connection. If you are disconnected, then the Router
will automatically re-establish your connection. To use
this option, select
Keep Al±ve
. In the
Redial Period
field,
you specify how often you want the Router to check
the Internet connection. The default Redial Period is
²0
seconds.
PPTP
Point-to-Point Tunneling Protocol (PPTP) is a service that
applies to connections in Europe only.
Internet Connection Type > PPTP
If your ISP supports DHCP or you are connecting through
a dynamic IP address, then select
Obta±n an IP Address
Automat±cally
. If you are required to use a permanent IP
address to connect to the Internet, then select
Spec±fy an
IP Address
. Then configure the following:
Spec±fy
an IP Address
This is the Router’s IP address,
as seen from the Internet. Your ISP will provide you
with the IP Address you need to specify here.
Subnet Mask
This is the Router’s Subnet Mask, as
seen by users on the Internet (including your ISP). Your
ISP will provide you with the Subnet Mask.
Default Gateway
Your ISP will provide you with the
IP address of the ISP server.
DNS 1-²
Your ISP will provide you with at least one
DNS (Domain Name System) server IP address.
PPTP Server IP Address
Your ISP will provide you with
the IP address of the PPTP server.
Username and Password
Enter the Username and
Password provided by your ISP.
Connect on Demand: Max Idle T±me
You can configure
the Router to cut the Internet connection after it has been
inactive for a specified period of time (Max Idle Time). If
your Internet connection has been terminated due to
Page 9 / 38
Chapter±3
Advanced Configuration
´
W±reless-N Broadband Router
inactivity, Connect on Demand enables the Router to
automatically re-establish your connection as soon as you
attempt to access the Internet again. To use this option,
select
Connect on Demand
. In the
Max Idle Time
field,
enter the number of minutes you want to have elapsed
before your Internet connection terminates. The default
Max Idle Time is
minutes.
Keep Al±ve: Red±al Per±od
If you select this option, the
Router will periodically check your Internet connection. If
you are disconnected, then the Router will automatically
re-establish your connection. To use this option, select
Keep Al±ve
. In the
Redial Period
field, you specify how often
you want the Router to check the Internet connection. The
default value is
²0
seconds.
L2TP
L2TP is a service that applies to connections in Israel only.
Internet Connection Type > L2TP
Server IP Address
This is the IP address of the L2TP
Server. Your ISP will provide you with the IP Address you
need to specify here.
Username and Password
Enter the Username and
Password provided by your ISP.
Connect on Demand: Max Idle T±me
You can configure
the Router to cut the Internet connection after it has been
inactive for a specified period of time (Max Idle Time). If
your Internet connection has been terminated due to
inactivity, Connect on Demand enables the Router to
automatically re-establish your connection as soon as you
attempt to access the Internet again. To use this option,
select
Connect on Demand
. In the
Max Idle Time
field,
enter the number of minutes you want to have elapsed
before your Internet connection terminates. The default
Max Idle Time is
minutes.
Keep Al±ve: Red±al Per±od
If you select this option,
the
Router
will
periodically
check
your
Internet
connection. If you are disconnected, then the Router
will automatically re-establish your connection. To use
this option, select
Keep Al±ve
. In the
Redial Period
field,
you specify how often you want the Router to check
the Internet connection. The default Redial Period is
²0
seconds.
Telstra Cable
Telstra Cable is a service that applies to connections in
Australia only.
Internet Connection Type > Telstra Cable
Server IP Address
This is the IP address of the Heartbeat
Server. Your ISP will provide you with the IP Address you
need to specify here.
Username and Password
Enter the Username and
Password provided by your ISP.
Connect on Demand: Max Idle T±me
You can configure
the Router to cut the Internet connection after it has been
inactive for a specified period of time (Max Idle Time). If
your Internet connection has been terminated due to
inactivity, Connect on Demand enables the Router to
automatically re-establish your connection as soon as you
attempt to access the Internet again. To use this option,
select
Connect on Demand
. In the
Max Idle Time
field,
enter the number of minutes you want to have elapsed
before your Internet connection terminates. The default
Max Idle Time is
minutes.
Keep Al±ve: Red±al Per±od
If you select this option,
the
Router
will
periodically
check
your
Internet
connection. If you are disconnected, then the Router
will automatically re-establish your connection. To use
this option, select
Keep Al±ve
. In the
Redial Period
field,
you specify how often you want the Router to check
the Internet connection. The default Redial Period is
²0
seconds.
Optional Settings
Some of these settings may be required by your ISP. Verify
with your ISP before making any changes.
Optional Settings
Host Name and Doma±n Name
These fields allow you to
supply a host and domain name for the Router. Some ISPs,
usually cable ISPs, require these names as identification.
You may have to check with your ISP to see if your
broadband Internet service has been configured with a
Page 10 / 38
Chapter±3
Advanced Configuration
8
W±reless-N Broadband Router
host and domain name. In most cases, leaving these fields
blank will work.
MTU
MTU is the Maximum Transmission Unit. It specifies
the largest packet size permitted for Internet transmission.
Select Manual if you want to manually enter the largest
packet size that is transmitted. To have the Router select
the best MTU for your Internet connection, keep the
default setting,
Auto
.
S±ze
When Manual is selected in the
MTU
field, this option
is enabled. Leave this value in the 1200 to 1500 range. The
default size depends on the Internet Connection Type:
DHCP, Static IP, or Telstra:
1³00
PPPoE:
1492
PPTP or L2TP:
1460
Network Setup
The Network Setup section changes the settings on the
network connected to the Router’s Ethernet ports. Wireless
setup is performed through the Wireless tab.
Router IP
This presents both the Router’s IP Address and Subnet
Mask as seen by your network.
Router IP
DHCP Server Setting
The settings allow you to configure the Router’s Dynamic
Host Configuration Protocol (DHCP) server function. The
Router can be used as a DHCP server for your network. A
DHCP server automatically assigns an IP address to each
computer on your network. If you choose to enable the
Router’s DHCP server option, make sure there is no other
DHCP server on your network.
DHCP Server Setting
DHCP Server
DHCP is enabled by factory default. If you
already have a DHCP server on your network, or you don’t
want a DHCP server, then select
D±sabled
(no other DHCP
features will be available).
DHCP Reservat±on
Click this button if you want to assign
a fixed local IP address to a MAC address.
DHCP Reservation
You will see a list of DHCP clients with the following
information: Client Name, Interface, IP Address, and
MAC Address.
DHCP Reservation
Select Cl±ents from DHCP Table
Click the
Select
check box to reserve a client’s IP address. Then click
Add Cl±ents
.
Manually Add±ng Cl±ent
To manually assign an IP
address, enter the client’s name in the
Enter Client
Name
field. Enter the IP address you want it to have in
the
Assign IP Address
field. Enter its MAC address in the
To This MAC Address
field. Then click
Add
.
Clients Already Reserved
A list of DHCP clients and their fixed local IP addresses
will be displayed at the bottom of the screen. If you
want to remove a client from this list, click
Remove
.
Click
Save Sett±ngs
to apply your changes, or click
Cancel Changes
to cancel your changes. To view the
most up-to-date information, click
Refresh
. To exit this
screen, click
Close
.
Start IP Address
Enter a value for the DHCP server to
start with when is
suing IP addresses. Because the Router’s
default IP address is 192.168.1.1, the Start IP Address must
be 192.168.1.2 or greater, but smaller than 192.168.1.253.
The default Starting IP Address is
192.168.1.100
.
Max±mum
Number
of
Users
Enter
the
maximum
number of PCs that you want the DHCP server to assign
IP addresses to. This number cannot be greater than 253.
The default is
³0
.
IP Address Range
Displayed here is the range of available
IP addresses.

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