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Chapter±2
Wireless Security Checklist
³
W±reless-G ADSL Gateway w±th SpeedBooster
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, routers, and
gateways, 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.
3. Enable MAC address f±lter±ng
Linksys routers and gateways 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.
². 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
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Page 7 / 38
Chapter±3
Installation
´
W±reless-G ADSL Gateway w±th SpeedBooster
Chapter 3: Installat±on
Linksys strongly recommends that you run the Setup CD-
ROM. If you have problems running the Setup CD-ROM,
use this chapter.
Connection
Make sure that all the devices that you are working
with are powered down, including your computer(s)
and the Gateway. If you have a modem connected
to your network, disconnect it. The Gateway replaces
your modem.
Connect one end of the provided Ethernet cable to
your computer’s Ethernet adapter. Connect the other
end of the Ethernet cable to one of the Ethernet ports
on the back of the Gateway.
Connect the Computer
Repeat step 2 for every computer or device that
you want to connect to the Gateway via Ethernet.
If you connect more than four computers to the
Gateway, you also need to connect a switch to the
Gateway.
NOTE:
If your computer’s Ethernet adapter
is not set up, refer to the Ethernet adapter’s
documentation for more information.
Connect one end of the provided phone cable to the
wall jack with ADSL service.
Connect the other end of the phone cable to the Line
port on the back of the Gateway.
Connect the DSL
1.
2.
3.
4.
5.
NOTE:
To avoid interference, you may need
to place a microfilter or splitter between the
phone cable and wall jack. Contact your ISP to
determine if one is required. (UK residents need
to connect the microfilter to the wall phone jack
with ADSL service and then connect one end of
the provided phone cable to the RJ-11 port on it.)
If you use ISDN, then you do not need a
microfilter.
Connect the power adapter to the Gateway’s power
port and the electrical outlet.
Connect the Power
To power on the Gateway, push the power button on
the front panel.
Power on the computer that you want to use to
configure the Gateway.
NOTE:
If you have more than one phone and you
experience static on the line after installing the
Gateway, then you need to install an additional
microfilter for each phone or fax that you use.
Connect±on ±s complete.
Cont±nue to the “Setup” sect±on.
Setup
For setup, configure the Gateway to access the Internet
through your ADSL Internet Service Provider (ISP). Use the
setup information provided by your ISP.
Continue to “Chapter 4: Advanced Configuration”, and
complete the following sections:
Setup > Basic Setup
Wireless > Basic Wireless Settings
Wireless > Wireless Security
After
completing
the
setup,
to
test
it,
enter
www.l±nksys.com/reg±strat±on
in the web browser’s
Address
field, and press
Enter
.
Setup ±s complete.
6.
7.
8.
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Page 8 / 38
Chapter±4
Advanced Configuration
µ
W±reless-G ADSL Gateway w±th SpeedBooster
Chapter ²:
Advanced Conf±gurat±on
After setting up the Gateway with the Setup Wizard
(located on the CD-ROM), the Gateway will be ready
for use. However, if you’d like to change its advanced
settings, use the Gateway’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 Gateway.
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 Gateway, you
should use the Setup Wizard on the Setup CD-
ROM. If you want to configure advanced settings,
use this chapter.
How to Access the Web-Based Utility
To access the web-based utility, launch the web browser
on your computer, and enter the Gateway’s default IP
address,
192.1´8.1.1
, in the
Address
field. Then, press
Enter
.
A login screen appears. Use the default user name and
password,
adm±n
, unless you have changed them during
the Setup Wizard. (You can set a new user name and
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 Gateway’s general settings.
Setup > Basic Setup
Internet Setup
The Internet Setup section configures the Gateway to
your Internet connection. Most of this information can be
obtained through your ISP.
Internet Connection Type
Select the appropriate encapsulation method from the
drop-down menu. Each
Basic Setup 
screen and available
features will differ depending on which encapsulation
method you select. These are the available methods:
RFC 2364 PPPoA
RFC 2516 PPPoE
RFC 1483 Routed
IPoA
RFC 1483 Bridged
Bridge Mode Only
VC Settings
Configure your Virtual Circuit (VC) settings in this section.
Mult±plex±ng
Select
LLC
or
VC
, depending on your ISP.
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Chapter±4
Advanced Configuration
8
W±reless-G ADSL Gateway w±th SpeedBooster
QoS Type
Select from the drop-down menu:
CBR
(Continuous Bit Rate) to specify fixed bandwidth for voice
or data traffic;
UBR
(Unspecific Bit Rate) for application that
are not time-sensitive, such as e-mail; or
VBR
(Variable Bit
Rate) for bursty traffic and bandwidth-sharing with other
applications.
PCR Rate
For the Peak Cell Rate (PCR), divide the DSL line
rate by 424 to get the maximum rate the sender can send
cells. Enter the rate in the field (if required by your service
provider).
SCR Rate
The Sustain Cell Rate (SCR) sets the average cell
rate that can be transmitted. The SCR value is normally less
than the PCR value. Enter the rate in the field (if required
by your service provider).
Autodetect
Select
Enable
to
have
the
settings
automatically entered, or select
D±sable
to enter the
values manually.
V±rtual C±rcu±t
These fields consist of two items: VPI
(Virtual Path Identifier) and VCI (Virtual Channel Identifier).
Enter the settings provided by your ISP.
DSL
Modulat±on
Select
the
appropriate
mode:
Mult±Mode
,
T1.²13
,
G.dmt
,
G.l±te
,
ADSL2
, or
ADSL2+
.
Contact your ISP if you are not sure which mode to use.
Follow the instructions for your type of encapsulation.
RFC 2364 PPPoA
Some DSL-based ISPs use PPPoA (Point-to-Point Protocol
over ATM) to establish Internet connections. If you are
connected to the Internet through a DSL line, check with
your ISP to see if they use PPPoA. If they do, you will have
to enable PPPoA.
Internet Connection Type > RFC 2364 PPPoA
PPPoA Settings
Username and Password
Enter the Username and
Password provided by your ISP.
Connect on Demand: Max Idle T±me
You can configure
the Gateway 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 Gateway 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
³
minutes.
Keep Al±ve: Red±al Per±od
If you select this option,
the
Gateway
will
periodically
check
your
Internet
connection. If you are disconnected, then the Gateway
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 Gateway to check
the Internet connection. The default Redial Period is
30
seconds.
RFC 2516 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 > RFC 2516 PPPoE
PPPoE Settings
Username and Password
Enter the Username and
Password provided by your ISP.
Connect on Demand: Max Idle T±me
You can configure
the Gateway 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 Gateway 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
³
minutes.
Keep Al±ve: Red±al Per±od
If you select this option,
the
Gateway
will
periodically
check
your
Internet
connection. If you are disconnected, then the Gateway
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Page 10 / 38
Chapter±4
Advanced Configuration
9
W±reless-G ADSL Gateway w±th SpeedBooster
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 Gateway to check
the Internet connection. The default Redial Period is
30
seconds.
RFC 1483 Routed
If you are required to use RFC 1483 Routed, then select
RFC 1²83 Routed
.
Internet Connection Type > RFC 1483 Routed
IP Settings
Your ISP provides these settings.
Internet IP Address
Enter the Gateway’s IP address, as
seen from the Internet.
Subnet Mask
Enter the Gateway’s Subnet Mask, as seen
from the Internet (including your ISP).
Default Gateway
Enter the IP address of the ISP server.
Pr±mary
(Requ±red)
and
Secondary
(Opt±onal)
DNS
Enter the DNS (Domain Name System) server IP
address(es) provided by your ISP. At least one is required.
IPoA
If you are required to use IPoA (IP over ATM), then select
IPoA
.
Internet Connection Type > IPoA
IP Settings
Your ISP provides these settings.
Internet IP Address
Enter the Gateway’s IP address, as
seen from the Internet.
Subnet Mask
Enter the Gateway’s Subnet Mask, as seen
from the Internet (including your ISP).
Default Gateway
Enter the IP address of the ISP server.
Pr±mary
(Requ±red)
and
Secondary
(Opt±onal)
DNS
Enter the DNS (Domain Name System) server IP
address(es) provided by your ISP. At least one is required.
RFC 1483 Bridged
If you are required to use RFC 1483 Bridged, then select
RFC 1²83 Br±dged
.
Internet Connection Type > RFC 1483 Bridged
IP Settings
Select
Obta±n an IP Address Automat±cally
if your ISP
says you are connecting through a dynamic IP address.
If you are required to use a permanent (static) IP address
to connect to the Internet, then select
Use the follow±ng
IP Address
. Your ISP provides the settings needed for the
following fields:
Internet IP Address
Enter the Gateway’s IP address, as
seen from the Internet.
Subnet Mask
Enter the Gateway’s Subnet Mask, as seen
from the Internet (including your ISP).
Default Gateway
Enter the IP address of the ISP server.
Pr±mary
(Requ±red)
and
Secondary
(Opt±onal)
DNS
Enter the DNS (Domain Name System) server IP
address(es) provided by your ISP. At least one is required.
Bridge Mode Only
If you are using your Gateway as a bridge, which makes
the Gateway act like a stand-alone modem, select
Br±dge
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