Linksys WRT54GS User Manual page 21

Wireless-G Broadband Router with SpeedBooster
RADIUS. This option features WEP used in coordination with a RADIUS server. (This should only be used when a RADIUS server
is connected to the Router.) First, enter the RADIUS server's IP Address and port number, along with a key shared between the
Router and the server. Then, select a Default Transmit Key (choose which Key to use), and a level of WEP encryption, 64 bits
10 hex digits or 128 bits 26 hex digits. Last, either generate a WEP key using the Passphrase or enter the WEP key
manually.
WEP. WEP is a basic encryption method, which is not as secure as WPA. To use WEP, select a Default Transmit Key (choose
which Key to use), and a level of WEP encryption, 64 bits 10 hex digits or 128 bits 26 hex digits. Then either generate a
WEP key using the Passphrase or enter the WEP key manually.
Change these settings as described here and click the Save Settings button to apply your changes or Cancel Changes to
cancel your changes. For detailed instructions on configuring wireless security for the Router, turn to "Appendix B: Wireless
Security."
Figure 3-26: Wireless Tab - Wireless MAC Filter
Figure 3-27: MAC Address Filter List
Chapter 3: Configuring the Wireless-G Broadband Router 20
The Wireless Tab - Wireless Security