D-Link DI-308 - Manual (Page 76)

DI-308 ISDN Remote Router
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Start Port – Some applications can only send data over a certain range of port
numbers. Thus, all port numbers in the specified range must be exempt from the
NAPT port translation process. This field defines the beginning range of the port
numbers to be exempted from the NAPT port translation process.
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End Port – This field defines the last port number in the range of numbers
excluded from the NAPT process (see Start Port above).
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Connection Type – OutgoingControl or IncomingData. The user must initially
run the special application and send a request to the application server on the
Internet. This outgoing request to join a Diablo server, for example, is used to
trigger the exemption process for the incoming data.
In the example for the game Diablo shown in the above screen, if a packet is sent out
on the TCP port number 6112 (a request by a local user to a Diablo server on the
Internet to join a group game), all incoming packets on the UDP port 6112 (game
data) will not be translated by NAPT.
Please keep in mind that the user will always initiate use of the special application.
Thus, the first entry should always have the Connection Type of Outgoing Control.
Also, since the defined port number or range of port numbers will be mapped to the
user who triggered the outgoing control, all incoming data will be sent to that user.
Consequently, only one user can use the special application at a time.