TeleWell TW-EA200, Manual

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TW-EA500/EA200 ADSL Modem/Router
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3.4.3.5 Virtual Server Configuration
Being a natural Internet firewall, the ADSL Router protects your network from being accessed
by outside users. When it needs to allow outside users to access internal servers, e.g. Web server,
FTP server, E-mail server or News server, this product can act as a virtual server. You can set up
a local server with specific port number that stands for the service, e.g. Web (80), FTP (21),
Telnet (23), SMTP (25), POP3 (110), DNS (53), ECHO (7), NNTP (119). When an incoming
access request to the router for specified port is received, it will be forwarded to the
corresponding internal server.
For example, if you set the Public Port number 21 (FTP) to be mapped to the IP Address
192.168.1.100, then all the ftp requests from outside users will be forwarded to the local server
with IP address of 192.168.1.100.