ZyXEL Communications NBG-419N v2 - Page 141

Chapter 16 Network Address Translation (NAT)
NBG-419N v2 User’s Guide
141
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 Router’s port forwarding settings, click Network > NAT > Application.
The screen appears as shown.
Note: If you do not assign a Default Server IP address in the NAT > General screen,
the Router discards all packets received for ports that are not specified in this
screen or remote management.
Refer to Appendix E on page 261 for port numbers commonly used for particular services.
Figure 100 Network > NAT > Application
The following table describes the labels in this screen.
Table 64 Network > NAT > Application
LABEL DESCRIPTION
Add Application Rule
Active Select the check box to enable this rule and the requested service can be forwarded to the
host with a specified internal IP address.
Clear the checkbox to disallow forwarding of these ports to an inside server without having
to delete the entry.
Service Name Type a name (of up to 31 printable characters) to identify this rule in the first field next to
Service Name. Otherwise, select a predefined service in the second field next to Service
Name. The predefined service name and port number(s) will display in the Service Name
and Port fields.
Port Type a port number(s) to define the service to be forwarded to the specified server.
To specify a range of ports, enter a hyphen (-) between the first port and the last port, such
as 10-20.
To specify two or more non-consecutive port numbers, separate them by a comma without
spaces, such as 123,567.
Server IP
Address
Type the IP address of the server on your LAN that receives packets from the port(s)
specified in the Port field.