ZyXEL Communications Internet Security Gateway ZyWALL 100 - Manual (Page 139)

ZyWALL 100 Internet Security Gateway
12-26 NAT
Table 12-8 Menu 15.3—Trigger Port Setup Description
FIELD DESCRIPTION EXAMPLE
Rule This is the rule index number. 1
Name Enter a unique name for identification purposes. You may enter up to 15
characters in this field. All characters are permitted - including spaces. Real Audio
Incoming Incoming is a port (range) that accepts WAN traffic. It is the “listening “ port of
the client software on LAN computers.
Start Port Enter a port number or the starting port number in a range of port numbers. 6970
End Port Enter a port number or the ending port number in a range of port numbers. 7170
Trigger Trigger is a port (range) your ZyWALL checks to “remember” a computer IP
address on the LAN when it sends traffic from the LAN to the WAN. It is the
“listening” port of the server on the WAN side.
Start Port Enter a port number or the starting port number in a range of port numbers. 7070
End Port Enter a port number or the ending port number in a range of port numbers. 7070
Press [ENTER] at the message “Press ENTER to Confirm...” to save your configuration, or press [ESC]
at any time to cancel.
12.6.2 Trigger Port Forwarding Process
The following is an example of trigger port forwarding.
.
Figure 12-25 Trigger Port Forwarding Process — Example
1. Jane requests a file from the Real Audio server.
2. Port 7070 is a trigger port the ZyWALL uses to remember Jane’s computer IP address.