D-Link DSL 2740B - Manual (Page 66)

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INCOMING IP FILTER
By default, all incoming packets are blocked if Firewall is enabled. But you can allow specific type of packets to be
accepted by setting up incoming IP filter.
1. Click the Add A Rule button to enter your incoming IP filter configuration window.
2. Enter the filter name and at least one of the following criteria: Protocol, Source/Destination IP Address, and
Source/Destination Port.
3. Select WAN interface(s) to apply this rule.
4. Click Add A Rules button to apply settings.