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A Typical Internet Application
A typical Internet application is shown in Figure 1-4. In this example, the workstations are tied to the
HUB (LAN) and the ProxyServer is connected to the HUB via an unregistered IP Address. The WAN
ports were all configured to connect to an external Data Communications Equipment (DCE) device
that was connected to the ISP during the loading of the software.
Now, let's talk about some of the specifics that make this application work. Before the workstations
can access the Internet, they have to have an IP stack loaded on the workstation and pointed toward
the Proxy Server. The procedures for loading the IP stack are provided in the Chapter 5 - Client
Setup.
When the ProxyServer software is loaded and the ProxyServer configured, two approaches can be
considered for the IP address of the WAN ports that connect to the ISP. The ISP can dynamically
assign the IP address to the ProxyServer or the ISP can assign a fixed IP address for the
ProxyServer. Probably, the most common approach would be for the ISP to dynamically assign the IP
address, since registered IP addresses are becoming a premium. Since the IP addressing is
established during the loading and configuring of the ProxyServer, it is recommended that you
determine the desired addressing scheme prior to installing the software (see Chapter 3).
After initial configuration (e.g., Wizard Setup) you can view or change the IP Setup parameters for
the LAN and WAN ports by selecting the IP button on the Proxy Setup dialog box (see Chapter 4 -
ProxyServer Software for a full description of software features).
Dial-Up ISP Accounts
to the Internet
Modem/DSU
Modem/DSU
LAN Connection
IP Address 192.168.0.101
Mask 255.255.255.0
Hub
Novell Server
IP Address
192.168.0.102
Windows NT Server
IP Address
192.168.0.103
Mail Server
IP Address
192.168.0.105
192.168.0.104
Figure 1-4. Typical Internet Application
Chapter 1 - Introduction and Description
Modem/DSU
Serial ProxyServer
Workstation
IP Address
192.168.0.107
Workstation
IP Address
192.168.0.106
Workstation
IP Address
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