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ProxyServer User Guide
Enabling the Virtual Server
The virtual server feature of the ProxyServer allows you to have multiple servers on your local area
network (LAN) with one static IP address (from your ISP or Multi-Tech's Global Dynamic WAN
Addressing) assigned to each WAN port. A normal internet connection requires a static IP address
for each server on your LAN. A normal Internet connection is shown in the following illustration.
In a normal Internet connection with a router connected to the Internet, you need a static IP address
for each function (server) you want to perform on the Internet. For example, to have a Web server
browse the internet for you, you need an IP address so that the router knows where the traffic is
coming from and where to send the reply. In our normal Internet connection we have assigned an
address of 204.111.2.30 for the Web server, address 204.111.2.20 for the FTP server, and
204.111.2.60 for the Firewall.
To reduce the number of static IP addresses, a virtual server feature is present in the ProxyServer
that allows you to map multiple local servers to a single static IP address or to a Global Dynamic
WAN port address. The virtual server feature enables the ProxyServer to take requests from
different servers (functions) and interact with the Internet based on the functionality of the request. In
the normal Internet connection, this was a physical linkage to a specific IP address. The virtual
server feature is a functional connection. Functionality is defined by how the server is used; i.e., the
Web server uses a www-http protocol, an e-mail server uses pop-3 and SMTP protocol. Therefore,
multiple requests can be sent to the Internet over a single physical connection and the ProxyServer
will know which server is requesting service. The following illustration shows how a ProxyServer is
connected to the Internet with a single static IP address or Global Dynamic WAN port address and
the same servers used in the normal Internet connection are now connected to the Internet through
the ProxyServer.
Now, if instead of mapping a static IP address from your ISP to the ProxyServer, you employed Multi-
Tech's Global Dynamic WAN port addressing method, you no longer have to be concerned with a
single static IP address from your ISP. You can assign a predefined Global Dynamic WAN port
44
Internet
Router
Firewall
204.111.2.60
Secure
LAN
Web Server
204.111.2.30
Hub
FTP Server
204.111.2.20
MTPSR3-200
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