D-Link Wireless ADSL2/2+ 4-port Ethernet Router DSL-2640U - Manual (Page 37)

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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.
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.