How do I enable wireless MAC filtering to control network access?
Navigate to Wireless > Wireless MAC Filtering and click Enable. Add the MAC addresses of devices you want to allow or block access. You can set the filtering rule to either 'Allow the stations specified by any enabled entries' or deny specific devices. Each entry can be enabled or disabled individually.
From the official TP Link Tl WR841N Wireless N Router manual, page 42
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