ProxyServer User Guide
26
Virtual Server Mapping
The Virtual Server function allows a reverse network address translation from WAN to
LAN. Normally when you use the ProxyServer to access the Internet you use the NAT
function from LAN to WAN.
Theoretically it is possible to use the Virtual Server to set up a Web page or FTP site
because the ProxyServer can let outside users access designated sites on your network
that you map in Virtual Server. However, please be aware of the fact that the speed that
they have access will be limited by the speed of your modem or ISDN TA. You can also
use the Virtual Server to support applications like chat programs and Internet Telephony.
To enable the Virtual Server function click the Enabled circle.
For each service that you want to set up on your Internet site:
A) Select which protocol (Either TCP or UDP) the service uses. Most services use TCP
(WWW, FTP, E-mail etc..).
B) Enter your IP address supplied by your ISP in the External IP field. If your ISP gives
you a dynamic IP address, you can set this as 0 . 0 . 0 . 0 . Virtual Server will then
use whatever dynamic IP address your ISP gives you as the external IP. Enter the
port number for the service that you will be using for this mapping.
C) Enter the IP address of the computer or device that will act as the “server” site on
your network in the Internal IP field. Enter the port number for the service that you
will be using for this mapping.
D) Click Insert to insert the mapping.
Note: A limitation of the Virtual Server is that you can only use one computer per port.
For example, if you set one computer to be mapped to support chat, only that computer
can use that program. All request packets from the Internet with a port number
corresponding to chat will then be sent to the internal IP in the mapping.
Virtual Server Mapping Example (Web or other Server)
In this example we have set up a mapping with a Web page and Telnet server:
•
Both services use TCP. WWW service has a port number of 80 and Telnet has a port
number of 23
•
The External IP address that we are using is dynamic so we have entered 0.0.0.0.
•
Our Internet site server on our network has an IP address of 213.0.0.10
Now anyone who tries to access our dynamic IP address will automatically be forwarded
to our Internal network server at our internal IP address of 213.0.0.10.
Note: If you would like to keep the connection permanently open after you have dialed-
up your ISP, you should disable the idle-time out function. Please see Chapter 3 –
ProxyServer Manager : Dialup/Hangup Settings.
Summary of Contents for ProxyServer MTPSR1-100
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