This might help with the PEAP:

http://www.cisco.com/en/US/products/sw/secursw/ps2086/products_configuration_example09186a00807917aa.shtml

MAC Authentication

Add a MAC Address to ACS

Complete these steps:

1. From the ACS main menu, click on the User Setup button.

2. In the User text box, enter the MAC address to add to the user database.

Note: The MAC address must be exactly as it is sent by the AP for both the username and the password. If authentication fails, check the failed attempts log to see how the MAC is being reported by the AP. Do not cut and paste the MAC address, as this can introduce phantom characters.

3. On the User Setup screen, enter the MAC address in the Secure-PAP password text box.

Note: The MAC address must be exactly as it is sent by the AP for both the username and the password. If authentication fails, check the failed attempts log to see how the MAC is being reported by the AP. Do not cut and paste the MAC address, as this can introduce phantom characters.

4. Check the Separate (CHAP/MS-CHAP) box.

5. Enter a password for CHAP/MS-CHAP (this password should be different from the MAC address).

6. Click Submit.