Chapter 4      Security Setup
Setting Up MAC-Based Authentication
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Cisco Aironet 1200 Series Access Point Software Configuration Guide
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Figure 4-12 AP Radio Advanced Page
Step 15 Select Disallowed from the pull-down menu for Default Unicast Address Filter 
for each authentication type requiring MAC-based authentication. 
For example, if the access point is configured for both open and Network-EAP 
authentication, you could set Default Unicast Address Filter under Open to 
Disallowed but leave Default Unicast Address Filter under Network-EAP set to 
Allowed. This configuration forces client devices using open authentication to 
authenticate using MAC addresses but does not force LEAP-enabled client