Figure 89 Trigger Port; Table 57 Trigger Port - ZyXEL Communications P-662H-61 User Manual

Chapter 9 Network Address Translation (NAT) Screens
to the LAN IP address of the computer that sent the request. After that computer's connection
for that service closes, another computer on the LAN can use the service in the same manner.
This way you do not need to configure a new IP address each time you want a different LAN
computer to use the application.
For example:
1 Jane (A) requests a file from the Real Audio server (port 7070).
2 Port 7070 is a "trigger" port and causes the ZyXEL Device to record Jane's computer IP
address. The ZyXEL Device associates Jane's computer IP address with the "incoming"
port range of 6970-7170.
3 The Real Audio server responds using a port number ranging between 6970-7170.
4 The ZyXEL Device forwards the traffic to Jane's computer IP address.
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 Network > NAT > Trigger Port to open the following screen. Use this screen to add
and view trigger port rules configured on your ZyXEL Device.

Figure 89 Trigger Port

The following table describes the labels in this screen.

Table 57 Trigger Port

LABEL
Service
Name
Incoming
Port Range
Start Port
End Port
Trigger Port
Range
Start Port
End Port
Add
#
152
DESCRIPTION
Type a unique name (up to 15 characters) for identification purposes. All characters
are permitted - including spaces.
The incoming 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.
Type a port number or the starting port number in a range of port numbers.
Type a port number or the ending port number in a range of port numbers.
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.
Type a port number or the starting port number in a range of port numbers.
Type a port number or the ending port number in a range of port numbers.
Click this button to add a rule to the table below.
Click this check box to enable the rule.
P-662H/HW-D Series User's Guide