Arcadyan Technology Corporation WG7005B Manuale Utente

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Virtual Server
If you configure the ADSL 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 redirected to local servers configured with 
private IP addresses. In other words, depending on the requested service 
(TCP/UDP port number), the ADSL Router redirects the external service 
request to the appropriate server (located at another internal IP address).
 
For example, if you set Type/Public Port to TCP/80 (HTTP or web) and 
the Private IP/Port to 192.168.2.2/80, then all HTTP requests from 
outside users will be transferred to 192.168.2.2 on port 80. Therefore, by 
just entering the IP address provided by the ISP, Internet users can access 
the service they need at the local address to which you redirect them. 
The more common TCP service ports include: 
HTTP: 80, FTP: 21, Telnet: 23, and POP3: 110. 
A list of ports is maintained at the following link: 
http://www.iana.org/assignments/port-numbers.