D-Link DES-1252 - Manual (Page 57)

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Security > Mac Address Table > Static Mac
This page provides two distinct features. The top table provides the
ability to turn off auto learning Mac address if a port isn't connected to
an uplink Switch (i.e. DHCP Server). By default, this feature is OFF
(disabled). The Macs listed on this table may only connect from
corresponding ports and VIDs, in order to protect the network from
illegal Macs.
Figure 402 – Security > Static Mac Address
To initiate the removal of auto-learning for any of the uplink ports,
press On to enable this feature, and select the port(s) for auto learning
to be disabled.
The Static Mac Address Setting table displays the static Mac
addresses connected, as well as the VID. Press Delete to remove a
device. To add a new Mac address assignment, press Add Mac, then