I've set up two wireless desktop PC's to connect to my AP1242AG access point, and from another (wired) machine I can see them on the LAN and share their files. But when I use mac address filters on the AP the wireless clients stop working on the LAN. In the AP I've tried including the mac addresses from other (wired) machines on the LAN but the wireless clients go awol. When I delete the mac address filtering the wireless clients comes back on the LAN again. What am I doing wrong? Thanks for any help.
If you are using WPA for you primary authentication MAC address filtering is not supported.
Note In Cisco IOS releases 12.3(4)JA and later, you cannot enable both MAC-address authentication and WPA-PSK.
From this Configuration Guide
If you want to restrict access by MAC address an ACL on the switch will work.