D-Link DSL-2790U User Manual page 57

Configuration
Destination Port (port The Destination Port is the TCP/UDP port on either the LAN or WAN depending on if you are configuring an Outbound or Inbound
or port:port) Filter rule.
This window allows you to create a filter rule of MAC Filtering.
Click change default policy to change the mode of policy.
Now default policy is FORWARD, it means all MAC from LAN is forward, but
some MAC traffic can be blocked by setting up filters.
If you are setting up the MAC filtering, click the Add button.
Enter the information in the section. Click the Apply / Save button to add the
entry in the Active Outbound MAC Filtering table.
MAC Filtering