Multiple Servers Behind Sua; Configuring A Server Behind Sua - ZyXEL Communications ZyXEL Prestige 310 User Manual

When SUA is disabled, the Prestige will send the packets from workstations to the remote host with
workstation's IP and port to the destination's IP and port. If the workstation uses private IP (Private Networks
IPs: 10.0.0.0 ~ 10.255.255.255; 172.16.0.0. ~ 172.31.255.255; 192.168.0.0. ~ 192.168.255.255) in SUA
mode, the packet will be routed by the Prestige but will be dropped somewhere and never returned. This is
because only a legal IP is valid on the Internet. Hence, in non-SUA mode, the workstation must use non-
private/legal IP.
4.2

Multiple Servers behind SUA

If you wish, you can make inside servers for different services, e.g., web or FTP, visible to the outside users,
even though SUA 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, if you have a web server at 192.168.1.2 and an FTP server 192.168.1.3, then you need to
specify for port 80 (web) the server at IP address 192.168.1.2 and for port 21 (FTP) another at IP address
192.168.1.3.
Please note that a server can support more than one service, e.g., a server can provide both FTP and DNS
service, while another provides only web service. Also, since you need to specify the IP address of a server
in the Prestige, a server must have a fixed IP address and not be a DHCP client whose IP address potentially
changes each time it is powered on.
In addition to the servers for specific services, SUA supports a default server. A service request that does not
have a server explicitly designated for it is forwarded to the default server. If the default server is not
defined, the service request is simply discarded.
To make a server visible to the outside world, specify the port number of the service and the inside IP address
of the server in Menu 15, Multiple Server Configuration.
For more information on configuring supporting applications behind SUA refer to the

4.2.1 Configuring a Server behind SUA

Follow the steps below to configure a server behind SUA:
Step 1
Enter 15 in the main menu to go to Menu 15 - Multiple Server Configuration.
Step 2 Enter the service port number in the Port # field and the inside IP address of the server in the IP
Address field.
Step 3 Press [Enter] at the "Press ENTER to confirm ..." prompt to save your configuration after you
define all the servers or press ESC at any time to cancel.
SUA and Multiple SUA Servers
ZyNOS Support Note documentation in your Support CD.
Prestige 310 Broadband Sharing Gateway
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