Sua Servers; Port Forwarding: Services And Port Numbers - ZyXEL Communications Vantage CNM User Manual

Vantage CNM User's Guide
Table 46 Configuration > NAT - Prestige
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9.4 SUA Servers

A SUA server set is a list of inside (behind NAT on the LAN) servers, for example, web or
FTP, that you can make visible to the outside world even though SUA makes your whole
inside network appear as a single computer to the outside world. The ZyXEL device provides
the additional safety of a DMZ port for connecting your publicly accessible servers. This
makes the LAN more secure by physically separating it from your public servers.
You may enter a single port number or a range of port numbers to be forwarded, and the local
IP address of the desired server. The port number identifies a service; for example, web
service is on port 80 and FTP on port 21. In some cases, such as for unknown services or
where one server can support more than one service (for example both FTP and web service),
it might be better to specify a range of port numbers. You can allocate a server IP address that
corresponds to a port or a range of ports.
Many residential broadband ISP accounts do not allow you to run any server processes (such
as a Web or FTP server) from your location. Your ISP may periodically check for servers and
may suspend your account if it discovers any active services at your location. If you are
unsure, refer to your ISP.
In addition to the servers for specified services, NAT supports a default server IP address. A
default server receives packets from ports that are not specified in this screen.
Note: If you do not assign a Default Server IP Address the ZyXEL device discards all
packets received for ports that are not specified here or in the remote
management setup.

9.4.1 Port Forwarding: Services and Port Numbers

The most often used port numbers are shown in the following table. Please refer to RFC 1700
for further information about port numbers. Please also refer to the Supporting CD for more
examples and details on SUA/NAT
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Services and Port Numbers
Chapter 9 Configuration > NAT