D-Link DSL-2540U User Manual page 47

Section 3 – Configuration
IP Filtering – Incoming
This window allows you to create a filter rule of Incoming.
Click change default policy to change the mode of policy.
Now default policy is ACCEPT, it means all incoming IP traffic from WAN
is accepted, but some IP traffic can be blocked by setting up filters.
If you are setting up the incoming IP filtering, click the Add button.
Now default policy is BLOCK, it means all incoming IP traffic from WAN is
blocked, but some IP traffic can be accepted by setting up filters.
If you are setting up the incoming IP filtering, click the Add button.
D-Link DSL-2540U User Manual 47