SMC Networks SMC7904BRA - Manual (Page 88)

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MAC Filter
The Barricade ADSL Router can also limit the network access based on
the MAC address. The MAC Filtering Table allows the Barricade ADSL
Router to enter up to 32 MAC addresses that are not allowed access to the
WAN port.
Click Yes to enable, or No to disable this function.
Enter the MAC address in the space provided.
You also can select the connected client(s) from the drop down menu of
the DHCP Client List, and copy the MAC address(es) to the MAC
Filtering Table.