D-Link DSL-2640B - Manual (Page 36)

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Incoming IP Filtering Setup
Incoming IP filter allows specified the WAN traffic to pass through the firewall.
Click on the Add button to add incoming filter settings.
Enter a filter name, information about the source address (from the WAN side), and
information about the destination address (to the LAN side). Select the protocol
and WAN interface, then click on Apply to add the setting.