Draytek Vigor2920n User Manual page 153

Local Computer
Protocol
Start Port
End Port
setting is available when WAN IP Alias is configured.
Enter the private IP address of the local host or click Choose PC
to select one.
Choose PC - 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.
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Vigor2920 Series User's Guide