D-Link DSL-2790U User Manual page 56

Configuration
IP Filtering – Incoming
This window allows you to create a filter rule of Incoming.
Now default policy is ACCEPT, 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.
Enter the information in the section. Explanations of parameters are described
below. Click the Apply / Save button to add the entry in the Active Inbound IP
Filtering table.
.
Filters Parameter
Filter Name Enter a name for the new filter.
IP Version Ipv4/Ipv6
Protocol Select the transport protocol (Any, TCP/UDP, TCP, UDP or ICMP) that will be used for the filter rule.
Source IP Enter the start IP address which you are creating the filter rule.
address[/prefix
length]
Source Port (port or The Source Port is the TCP/UDP port on either the LAN or WAN depending on if you are configuring an Outbound or Inbound Filter
port:port) rule.
Destination IP Enter the end IP address which you are creating the filter rule.
address[/prefix
length]
Description