22

Appendix A: Troubleshooting

Frequently Asked Questions

Wireless-G Range Expander

How do I avoid interference?

Using multiple access points on the same channel and in close proximity to one another will generate

interference.

When employing multiple access points, be sure to operate each one on a different channel

(frequency).

How do I reset the Range Expander?

Press the Reset button on the back of the Range Expander for about ten seconds. This will reset the unit to its

default settings.

How do I resolve issues with signal loss?

There is no way to know the exact range of your wireless network without testing. Every obstacle placed

between points in a network will create signal loss.

Leaded glass, metal, concrete floors, water and walls will

inhibit the signal and reduce range.

Start with your access point and your wireless PC in the same room and

move it away in small increments to determine the maximum range in your environment.

You may also try using different channels, as this may eliminate

interference affecting only one channel.

Also, due to FCC regulations, more power may be transmitted, using 802.11a, on channels 52, 56, 60 and 64,

than on the lower channels.

Lastly, check the Advanced tab of the Web-Based Utility and make sure that FULL

is selected in the Transmission Rate field.

23

Appendix B: Wireless Security

Security Precautions

Wireless-G Range Expander

Appendix B: Wireless Security

Linksys wants to make wireless networking as safe and easy for you as possible. The current generation of

Linksys products provide several network security features, but they require specific action on your part for

implementation. So, keep the following in mind whenever you are setting up or using your wireless network.

Security Precautions

The following is a complete list of security precautions to take (as shown in this User Guide) (at least steps 1

through 5 should be followed):

1.

Change the default SSID.

2.

Disable SSID Broadcast.

3.

Change the default password for the Administrator account.

4.

Enable MAC Address Filtering.

5.

Change the SSID periodically.

6.

Use the highest encryption algorithm possible. Use WPA if it is available. Please note that this may reduce

your network performance.

7.

Change the WEP encryption keys periodically.

To ensure network security, steps one through five should be followed, at least.

Security Threats Facing Wireless Networks

Wireless networks are easy to find. Hackers know that in order to join a wireless network, wireless networking

products first listen for “beacon messages”. These messages can be easily decrypted and contain much of the

network’s information, such as the network’s SSID (Service Set Identifier). Here are the steps you can take:

Change the administrator’s password regularly.

With every wireless networking device you use, keep in mind

that network settings (SSID, WEP keys, etc.) are stored in its firmware. Your network administrator is the only

person who can change network settings. If a hacker gets a hold of the administrator’s password, he, too, can

change those settings. So, make it harder for a hacker to get that information. Change the administrator’s

password regularly.

Note:

Some of these security features are

available only through the network router or

access point. Refer to the router or access

point’s documentation for more information.

24

Appendix B: Wireless Security

Security Threats Facing Wireless Networks

Wireless-G Range Expander

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.

25

Appendix B: Wireless Security

Security Threats Facing Wireless Networks

Wireless-G Range Expander

WPA Pre-Shared Key

. If you do not have a RADIUS server, select the type of algorithm, TKIP or AES, enter a

password in the Pre-Shared key field of 8-64 characters, and enter a Group Key Renewal period time between

0 and 99,999 seconds, which instructs the Router or other device how often it should change the encryption

keys.

WPA RADIUS

. 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.

26

Appendix C: Upgrading Firmware

Wireless-G Range Expander

Appendix C: Upgrading Firmware

The Range Expander's firmware is upgraded through the Web-Utility's Help tab. Follow these instructions:

1.

Download the firmware from Linksys's website at

www.linksys.com

.

2.

Click

Upgrade Firmware

from the Web-Utility's Help tab, and the

Upgrade Firmware

screen will appear.

3.

Enter the location of the firmware's file or click the

Browse

button to find the file.

4.

Then, click the

Upgrade

button to upgrade the firmware.

Figure C-1: Upgrade Firmware