D-Link DSL-2877AL User Manual page 59

D-Link DSL-2877AL Dual Band Wireless AC750 VDSL/ADSL2+ Modem Router User Manual
2.4G WLAN Access Rules
Without WLAN MAC access restriction, any WLAN client can join (authenticate with)
a Wi-Fi network if they know the network name (also called the SSID) and perhaps a
few other security parameters like encryption keys.
When WLAN MAC access is enabled, however, the access point or router performs
an additional check on a different parameter. Obviously the more checks that are
made, the greater the likelihood of preventing network break-ins.
To set up WLAN MAC access rules, you as a WLAN administrator must configure a
list of clients that will be allowed to join the network.
Section 3 - Web User Interface Configuration Page 57