Nat Application Screen - ZyXEL Communications NBG-418N v2 User Manual

The following table describes the labels in this screen.
Table 48 Network > NAT > General
L ABEL
NAT Setup
Network Address
Translation
Default Server Setup
Enable
Server IP
Address
Apply
Reset
10.4 NAT Applic a tio n Sc re e n
Applic a tio n
Use the
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.
Note: 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.
Port forwarding allows you to define the local servers to which the incoming services will be forwarded.
To change your NBG-418N v2's port forwarding settings, click
appears as shown.
Note: If you do not assign a
418N v2 discards all packets received for ports that are not specified in this screen or
remote management.
Refer to Appendix F on page 218
Chapter 10 Network Address Translation
DESC RIPT IO N
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).
This field displays whether the NAT is enabled or disabled.
Click the Ena b le check box to activate the default server.
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
If you do not assign a default server IP address, the NBG-418N v2 discards all packets received
for ports that are not specified in the
Click Apply to save your changes back to the NBG-418N v2.
Click Re se t to begin configuring this screen afresh.
screen to forward incoming service requests to the server(s) on your local network.
De fa ult Se rve r IP a ddre ss
for port numbers commonly used for particular services.
NBG-418N v2 User's Guide
106
Applic a tio n
Applic a tio n
screen or remote management.
Ne two rk > NAT
NAT > G e ne ra l
in the
screen.
> Applic a tio n . The screen
screen, the NBG-