D-Link DSL-2320B - 24 Mbps DSL Modem User Manual page 36

Section 8 - Advanced Setup
If you want to add an entry to the MAC filtering table,
Select Add from the MAC Filtering Setup screen. The
Add MAC Filter screen should then appear. Select a
Protocol Type, enter the Destination and Source MAC
address, the necessary Frame Direction, and WAN
interface (bridge mode only). Click Apply to save.
After you save the settings, a screen showing the settings will appear. On this screen you will be able to view and
delete MAC filtering rules.
D-Link DSL-30B ADSL+ Ethernet/USB Modem User Manual 36