D-Link Wireless ADSL2/2+ 4-port Ethernet Router DSL-2640U - Manual (Page 58)

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Wireless—MAC Filter
The MAC Filter feature allows you to disable, allow or deny users access to the
wireless router based on their MAC address. To add MAC addresses, click on Add to
continue. Click on Remove if you want to take out a MAC address from the MAC
filter list.
The MAC filter screen allows you to manage MAC address filters. Add the MAC
addresses that you want to manage and then select the mode that you want to use
to manage them. You can disable this feature or you can allow or deny access to
the MAC addresses that you add to the list.