Draytek Vigor 3100 Series User Manual page 42

However, if you previously have set up WAN Alias in Internet Access>>PPPoE/PPPoA or
Internet Access>>MPoA, you will find that WAN IP appeared for your selection.
Enable Open Ports
Comment
Local Computer
Choose PC
Protocol
Start Port
End Port
36
Check to enable this entry.
Make a name for the defined network application/service.
Enter the private IP address of the local host or click Choose PC to
select one.
Click this button and, subsequently, a window having a list of
private IP addresses of local hosts will automatically pop up. Select
the appropriate IP address of the local host in the list.
Specify the transport layer protocol. It could be TCP, UDP, or -----
(none) for selection.
Specify the starting port number of the service offered by the local
host.
Specify the ending port number of the service offered by the local
host.
Vigor3100 Series User's Guide