D-Link DSL-2640B - Manual (Page 42)

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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.
Parental Control
Time of Day Restrictions
In a home setting, parents can also restrict the day of the week certain computers
can access the router. Click on Add to set up the restrictions.
After you click you on Add, you will see the below screen where you will be able to
enter the MAC address of the PC that you wish to place on a time of day restriction.
Click on Apply to save the settings and to continue.