Chapter 8 Network Address Translation (NAT)
P-870H/HW Series User’s Guide
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5
Only Jane can connect to the Real Audio server until the connection is closed or
times out. The ZyXEL Device times out in three minutes with UDP (User Datagram
Protocol) or two hours with TCP/IP (Transfer Control Protocol/Internet Protocol).
Click NAT > Trigger Port to open the following screen. Use this screen to view
and configure your ZyXEL Device’s trigger port settings.
Figure 68
Trigger Port
The following table describes the labels in this screen.
Table 39
NAT Trigger Port
LABEL
DESCRIPTION
Service Name
Select a pre-defined service from the drop-down list box. The pre-
defined service port number(s) and protocol will display in the Trigger
port, Open port and Protocol fields.
Otherwise, select User Define to open the Rule Setup screen where
you can manually enter the port number(s) and select the IP protocol.
WAN Interface
Select the WAN interface through which the service is forwarded.
Trigger Port
The trigger port is a port (or a range of ports) that causes (or triggers)
the ZyXEL Device to record the IP address of the LAN computer that sent
the traffic to a server on the WAN.
Start
This is the first port number that identifies a service.
End
This is the last port number that identifies a service.
Protocol
This is the IP protocol.
Open Port
The open port is a port (or a range of ports) that a server on the WAN
uses when it sends out a particular service. The ZyXEL Device forwards
the traffic with this port (or range of ports) to the client computer on the
LAN that requested the service.
Start
This is the first port number that identifies a service.
End
This is the last port number that identifies a service.
Protocol
This is the IP protocol.
Add
Click this button to add a rule to the table below.
No.
This is the rule index number (read-only).
Active
This field indicates whether the rule is active or not.
Clear the check box to disable the rule. Select the check box to enable it.
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