D-Link DSL-2640B - Manual (Page 39)

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The below screen will appear when you click on Add. Input the filter name, source
information (from the LAN side), and destination information (from the WAN side).
Then click on Apply to save.
The following screen appears when you apply the IP filter. The screen lists the IP
filters that were added from the previous screen. To change your settings, click on
the Add or Remove buttons.