ZyXEL Communications NBG6503 User Manual
Chapter 14 Network Address Translation (NAT)
NBG6503 User’s Guide
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14.3 General NAT Screen
Use this screen to enable NAT and set a default server. Click Network > NAT > General to open
the following screen.
the following screen.
Figure 83 Network > NAT > General
The following table describes the labels in this screen.
14.4 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.
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.
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.
Table 50 Network > NAT > General
LABEL
DESCRIPTION
NAT Setup
Enable Network
Address
Translation
Address
Translation
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).
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.
Default Server Setup
Server IP
Address
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.
server receives packets from ports that are not specified in the Application screen.
If you do not assign a Default Server IP address, the Router discards all packets received
for ports that are not specified in the Application screen or remote management.
for ports that are not specified in the Application screen or remote management.
Apply
Click Apply to save your changes back to the Router.
Reset
Click Reset to begin configuring this screen afresh.