D-Link DSL-2740B User Manual page 57

Section 3 - Configuration
Select a name from the Application Name drop-down menu for
a pre-configured application or type a name in the Name input
box to define your own application.
Type an IP address in the IP address input box to appoint the PC
to receive the forwarded packets.
The External Port shows the ports opened for remote users in
the WAN side of the router. The TCP/UDP means the protocol
type of the opened ports.
The Internal Port shows the ports opened in the PC with the
appointed IP Address. The TCP/UDP means the protocol type of
the opened ports.
D-Link DSL-2740B User Manual 57