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60
Appendix B: Wireless Security
Security Threats Facing Wireless Networks
Wireless-G Broadband Router with SRX200
SSID.
There are several things to keep in mind about the SSID:
1.
Disable Broadcast
2.
Make it unique
3.
Change it often
Most wireless networking devices will give you the option of broadcasting the SSID. While this option may be
more convenient, it allows anyone to log into your wireless network. This includes hackers. So, don’t broadcast
the SSID.
Wireless networking products come with a default SSID set by the factory. (The Linksys default SSID is “linksys”.)
Hackers know these defaults and can check these against your network. Change your SSID to something unique
and not something related to your company or the networking products you use.
Change your SSID regularly so that any hackers who have gained access to your wireless network will have to
start from the beginning in trying to break in.
MAC Addresses.
Enable MAC Address filtering. MAC Address filtering will allow you to provide access to only
those wireless nodes with certain MAC Addresses. This makes it harder for a hacker to access your network with
a random MAC Address.
WEP Encryption.
Wired Equivalent Privacy (WEP) is often looked upon as a cure-all for wireless security
concerns. This is overstating WEP’s ability. Again, this can only provide enough security to make a hacker’s job
more difficult.
There are several ways that WEP can be maximized:
1.
Use the highest level of encryption possible
2.
Use “Shared Key” authentication
3.
Change your WEP key regularly
WPA
.
Wi-Fi Protected Access (WPA) is the newest and best available standard in Wi-Fi security. Two modes are
available: Pre-Shared Key and RADIUS. Pre-Shared Key gives you a choice of two encryption methods: TKIP
(Temporal Key Integrity Protocol), which utilizes a stronger encryption method and incorporates Message
Integrity Code (MIC) to provide protection against hackers, and AES (Advanced Encryption System), which utilizes
a symmetric 128-Bit block data encryption. RADIUS (Remote Authentication Dial-In User Service) utilizes a
RADIUS server for authentication and the use of dynamic TKIP, AES, or WEP.
IMPORTANT:
Always remember that each
device in your wireless network MUST use the
same encryption method and encryption key or
your wireless network will not function properly.
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61
Appendix B: Wireless Security
Security Threats Facing Wireless Networks
Wireless-G Broadband Router with SRX200
WPA/WPA2 Personal
. Select the type of algorithm, TKIP or AES, enter a password in the
Personal Key
field of
8-64 characters, and enter a Group Key Renewal time period between 0 and 7,200 seconds, which instructs
the Router or other device how often it should change the encryption keys.
WPA/WPA2
Enterprise
. WPA used in coordination with a RADIUS server. (This should only be used when a
RADIUS server is connected to the Router or other device.) First, select the type of WPA algorithm,
TKIP
or
AES
. Enter the RADIUS server’s IP Address and port number, along with a key shared between the device and
the server. Last, enter a Group Key Renewal period, which instructs the device how often it should change the
encryption keys.
RADIUS
. WEP used in coordination with a RADIUS server. (This should only be used when a RADIUS server is
connected to the Router or other device.) First, enter the RADIUS server’s IP Address and port number, along
with a key shared between the device and the server. Then, select a WEP key and a level of WEP encryption,
and either generate a WEP key through the Passphrase or enter the WEP key manually.
Implementing encryption may have a negative impact on your network’s performance, but if you are transmitting
sensitive data over your network, encryption should be used.
These security recommendations should help keep your mind at ease while you are enjoying the most flexible
and convenient technology Linksys has to offer.
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62
Appendix C: Upgrading Firmware
Wireless-G Broadband Router with SRX200
Appendix C: Upgrading Firmware
The Broadband Router's firmware is upgraded through the Web-based Utility's Administration tab. Follow these
instructions:
1.
Download the firmware from Linksys's website at
www.linksys.com
.
2.
Extract the firmware file on your PC.
3.
Click
Firmware Upgrade from
the Web-Utility's Administration tab, and the
Upgrade Firmware
screen, will
appear.
4.
Enter the location of the firmware's file or click the
Browse
button to find the file.
5.
Then, click the
Upgrade
button to upgrade the firmware.
Figure C-1: Upgrade Firmware
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63
Appendix D: Windows Help
Wireless-G Broadband Router with SRX200
Appendix D: Windows Help
Almost all Linksys wireless products require Microsoft Windows. Windows is the most used operating system in
the world and comes with many features that help make networking easier. These features can be accessed
through Windows Help and are described in this appendix.
TCP/IP
Before a computer can communicate with the Broadband Router, TCP/IP must be enabled. TCP/IP is a set of
instructions, or protocol, all PCs follow to communicate over a network. This is true for wireless networks as well.
Your PCs will not be able to utilize wireless networking without having TCP/IP enabled. Windows Help provides
complete instructions on enabling TCP/IP.
Shared Resources
If you wish to share printers, folder, or files over your network, Windows Help provides complete instructions on
utilizing shared resources.
Network Neighborhood/My Network Places
Other PCs on your network will appear under Network Neighborhood or My Network Places (depending upon the
version of Windows you're running). Windows Help provides complete instructions on adding PCs to your
network.
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64
Appendix E: Finding the MAC Address and IP Address for Your Ethernet Adapter
Windows 98SE or Me Instructions
Wireless-G Broadband Router with SRX200
Appendix E: Finding the MAC Address and IP Address for
Your Ethernet Adapter
This section describes how to find the MAC address for your computer’s Ethernet adapter so you can use the MAC
filtering and/or MAC address cloning feature of the Router. You can also find the IP address of your computer’s
Ethernet adapter. This IP address is used for the Router’s filtering, forwarding, and/or DMZ features. Follow the
steps in this appendix to find the adapter’s MAC or IP address in Windows 98, Me, 2000, or XP.
Windows 98SE or Me Instructions
1.
Click
Start
and
Run
. In the
Open
field, enter
winipcfg
. Then press the
Enter
key or the
OK
button.
2.
When the
IP Configuration
screen appears, select the Ethernet adapter you have connected to the Router via a
CAT 5 Ethernet network cable.
3.
Write down the Adapter Address as shown on your computer screen. This is the MAC address for your
Ethernet adapter and is shown as a series of numbers and letters.
The MAC address/Adapter Address is what you will use for MAC address cloning or MAC filtering.
Another screen will show the Ethernet adapter’s IP address. (Shown in the example as 192.168.1.100.) Your
computer may show something different.
Figure E-2: MAC Address/Adapter Address
Figure E-1: IP Configuration Screen
NOTE:
The MAC address is also called the Adapter Address.
Figure E-3: MAC Address/Physical Address
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