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Prestige 1600 Universal Access Concentrator
NAT
9-9
9.3 NAT Server Sets
A NAT server set is a list of inside servers (behind NAT on the LAN) that you can make visible to the outside
world. Menu 15.2 - NAT Server Sets is used to configure these servers.
9.3.1 Multiple Servers behind NAT
If you wish, you can make inside servers for different services, e.g., web or FTP, visible to the outside users, even
though NAT makes your whole inside network appear as a single machine to the outside world. A service is
identified by the port number, e.g., web service is on port 80 and FTP on port 21.
As an example (see the following figure), if you have a web server at 192.168.1.36 and an FTP server 192.168.1.33,
then you need to specify for port 80 (web) the server at IP address 192.168.1.36 and for port 21 (FTP) another at IP
address 192.168.1.33.
Please note that a server machine can support more than one service, e.g., a machine can provide both FTP and
DNS service, while another provides only web service.
Figure 9-9 Multiple Servers Behind NAT
9.3.2 Configuring Inside Servers
Follow the steps below to configure a server behind NAT:
Step 1. Enter 15 in the main menu to go to Menu 15 - NAT Setup.
Step 2.
Enter 2 to go to Menu 15.2 - NAT Server Sets.
Step 3.
Enter the service port number in the Port # field and the inside IP address of the server in the IP Address
field.