D-Link DWR-923 User Manual page 22

Wi-Fi Wi-Fi Access Control
Access control allows you to block or allow computer devices from
establishing a wireless link to the DWR-923. The filtering is based on
the wireless computer's unique hardware ID (MAC address). With this
feature you can prevent unknown or unauthorized computers from
accessing the DWR-923 and the services (like shares, DMC) it offers. In
most cases you know which devices will be connecting to the DWR-923
through a wireless connection, which allows you to add these known
devices to a list for authorized access. This feature helps in securing the
wireless connectivity of the home network.
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