Siemens Gigaset Owner's Manual page 33

Configuring the Gigaset Router
Virtual Server
If you configure the Gigaset Router as a virtual server, remote users accessing services
such as web or FTP at your local site via public IP addresses can be automatically redi-
rected to local servers configured with private IP addresses. In other words, depending
on the requested service (TCP/UDP port number), the Gigaset Router redirects the exter-
nal service request to the appropriate internal server and port.
The WAN interface must have a fixed IP address to properly utilize this function. For
example, if you set Type/Public Port to TCP/80 (HTTP or web) and the Private IP/Port to
192.168.2.2/8080, then all HTTP requests from outside users will be transferred to port
8080 on 192.168.2.2. Therefore, by just entering the IP Address provided by the ISP,
Internet users can access the service you provide at the internal address and port to
which the Gigaset Router redirects them.
Some of the more common TCP service ports include:
HTTP: 80, FTP: 21, Telnet: 23 and POP3: 110.
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