General Nat Screen; Nat Application Screen - ZyXEL Communications NBG6515 User Manual

16.3 General NAT Screen

Use this screen to enable NAT and set a default server. Click Network > NAT > General to open
the following screen.
Figure 89 Network > NAT > General
The following table describes the labels in this screen.
Table 58 Network > NAT > General
LABEL
NAT Setup
Enable Network
Address
Translation
Default Server Setup
Server IP
Address
Apply
Reset

16.4 NAT Application Screen

Use the Application screen to forward incoming service requests to the server(s) on your local
network. 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.
In addition to the servers for specified services, NAT 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 is not defined, the service request is simply discarded.
Chapter 16 Network Address Translation (NAT)
DESCRIPTION
Network Address Translation (NAT) allows the translation of an Internet protocol address
used within one network (for example a private IP address used in a local network) to a
different IP address known within another network (for example a public IP address used on
the Internet).
Select the check box to enable NAT.
In addition to the servers for specified services, NAT supports a default server. A default
server receives packets from ports that are not specified in the Application screen.
If you do not assign a Default Server IP address, the NBG discards all packets received
for ports that are not specified in the Application screen or remote management.
Click Apply to save your changes back to the NBG.
Click Reset to begin configuring this screen afresh.
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