Compex Technologies NetPassage 15B - Manual (Page 35)

Chapter 3 Configuring NetPassage 15B
28
Virtual Server based on IP Forwarding
If you have subscribed to a range of IP addresses from your ISP, you may also define
Virtual Servers based on IP Forwarding. This type of Virtual Server forwards all Internet
requests, regardless of the TCP port of the application, to a computer in the private
network. Refer to Figure 3.3.1-2.
Figure 3.3.1-2 shows two Virtual Servers based on IP Forwarding. One maps the public
IP 203.120.12.11 to private IP 192.168.168.10, and the other maps the public IP
203.120.12.12 to private IP 192.168.168.20.
Defining Virtual Server based on De-Militarized Zone (DMZ)
Due to the nature of Network Address Translator (NAT), the subnet behind the NAT
cannot be reached from the Internet. If you know the TCP/UDP port of an application,
such as HTTP, you can easily define a Virtual Server based on Port Forwarding behind
the NAT to support a Web Server in your private subnet. However, if you are uncertain
on the TCP/UDP port used by an application (certain Internet games), or an application
utilizes varying TCP/UDP port, you may define a DMZ host of which the NetPassage 15
will direct all the unresolved Internet requests to.
For example, if the WAN interface of NetPassage 15 has been assigned an IP address of
203.120.12.20 and you have defined a DMZ host with IP address of 192.168.168.10, all
the unresolved Internet requests to 203.120.12.20 will be forwarded to 192.168.168.10,
regardless of the TCP/UDP port.
Figure 3.3.1-2
Virtual Server based on
IP Forwarding