A-Link RoadRunner 40/44, Manual

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6.5 Virtual Server
The Virtual Server configuration allows you to set up public services
such as WWW,FTP that can be accessed by the Internet users. A
virtual server is defined as a service port , and all requests to this port
will be redirected to the host IP address. It supports only one server of
any particular type.
1. Set up private host to be a server and configure host a fixed IP address.
2. Public Port is well-known TCP or UDP port.
Well-known Ports :
21 (FTP) , 23 (Telnet) , 25 (SMTP) , 53 (DNS), 80 (HTTP)
3. Private Port is defined in the private host server.
4. Click “Add This Setting” when you set up completely.
6.6 Bridge Filtering