D-Link DFL-600 - Manual (Page 73)

Blocking MAC Addresses
The DFL-600 will allow you to make a list of MAC addresses for which
packets will be filtered. MAC (Media Access Control) addresses are the
physical addresses that are assigned to networking devices by their respective
manufacturers. These addresses are 12 hexadecimal digits long and are in the
form 01-23-45-67-89-AB
− where the numerals 0-9 and the letters A-F are
used.
Clicking on the MAC Add link on the Policy Rules page will open the
following page.
Enter a MAC Address that you want the DFL-600 to scan for and filter
packets that have that MAC address as their destination address. Click the
Apply button to enter the MAC address into the table.