Draytek Vigor2830 Series User Manual page 75

Private IP
Private Port
Note that the router has its own built-in services (servers) such as Telnet, HTTP and FTP etc.
Since the common port numbers of these services (servers) are all the same, you may need to
reset the router in order to avoid confliction.
redirection mode, you will see two boxes on this field. Simply
type the required number on the first box. The second one will
be assigned automatically later.
Specify the private IP address of the internal host providing the
service. If you choose Range as the port redirection mode, you
will see two boxes on this field. Type a complete IP address in
the first box (as the starting point) and the fourth digits in the
second box (as the end point).
Specify the private port number of the service offered by the
internal host
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Vigor2830 Series User's Guide