D-Link DSL-2740B User Manual page 53

Section 3 – Configurations
Select a WAN interface on the Use Interface.
Select a service name from the Select a Service drop-down
menu for a pre-configured application or type a name in the
Customer Server input box to define your own application.
You can choose the Allow All or Deny All on the Inbound Filter
to decide if you need to open the service you configured or close
the service. BTW, you don't have to delete the services to save
time and you can keep the service to use next time.
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 server PC with
the appointed IP Address. The TCP/UDP means the protocol
type of the opened ports.
D-Link DSL-2640B User Manual 53