D-Link DSL-2740B - Incoming IP Filter Rules Management

Section 3 - Configuration
D-Link DSL-2740B User Manual
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ADD OUTBOUND IP FILTER
Click Add button to set Port Forwarding Setup setting
Enter the Filter name and at least one of the following criteria:
Protocol, Source/Destination IP Address and Subnet Mask, and
Source/Destination Port.
Click on the Apply button to apply settings.