this is the only type of logging i see for this router
from
http://www.kvd1.com/Support/CommonPages/WRT54g1.htm
Setting up MAC Filtering
The Station MAC Filter option is a very good security feature. This option denies all wireless clients except those listed. To implement this feature please follow these instructions:
Before proceeding, please make sure that all the wireless computers are turned off.
1. From the "Setup" page, on the Log tab.
2. When the “Log” area loads, make sure that the “Access Log” is set to Enable, if it is not, then click on Enable, then click Apply.
3. Click on the View Log button, and a new window, “View Log”, will appear. Click on the Clear Log button, then turn on all the wireless PC’s.
4. After the Wireless PC’s have started and are logged onto the WAP11, click on the Refresh button. You should see all your wireless stations under the “Message” column. Leave this window open and proceed step.