ZyXEL Communications LTE3301-M209 User Manual page 89

Port forwarding allows you to define the local servers to which the incoming services will be forwarded.
To change your Zyxel Device's port forwarding settings, click Network > NAT > Port Forwarding. The
screen appears as shown.
Note: If you do not assign a Default Server, the Zyxel Device discards all packets received for
ports that are not specified in this screen or remote management.
Refer to Appendix B on page 171
Figure 58 Network > NAT > Port Forwarding
The following table describes the labels in this screen.
Table 38 Network > NAT > Port Forwarding
LABEL DESCRIPTION
Default Server Setup
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 Port Forwarding screen. You
can decide whether you want to use the default server or specify a server manually.
Select this to use the default server.
Change to Server Select this and manually enter the server's IP address.
Service Name Select a pre-defined service from the drop-down list box. The pre-defined service port
number(s) and protocol will be displayed in the port forwarding summary table.
Otherwise, select User define to manually enter the service name and port number(s) and
select the IP protocol.
Service Protocol Select the transport layer protocol supported by this virtual server. Choices are TCP, UDP, or
TCP_UDP.
If you have chosen a pre-defined service in the Service Name field, the protocol will be
configured automatically.
WAN Interface Select the WAN interface on which the matched packets are received.
Chapter 10 NAT
for port numbers commonly used for particular services.
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