D-Link DSL-2750U User Manual page 54

Click Add to add an inbound IP filter. The page shown in the following figure
appears.
Enter the Filter Name and specify at least one of the following criteria: protocol,
source/destination IP address, subnet mask, and source/destination port.
Click Apply to save the settings.
The ACTIVE INBOUND FILTER shows detailed information about each created
inbound IP filter.
Note:
The settings only apply when the firewall is enabled.
DSL-2750U User Manual
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