1 two points to remember about trigger ports – ZyXEL Communications Internet Security Gateway ZyWALL 100 User Manual
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ZyWALL 100 Internet Security Gateway
NAT
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the requested data comes back, the ZyWALL applies the port mapping rules and uses the recorded IP
address to get the data back to the proper computer.
LAN computers dynamically take turns using the mapping based on the trigger port. There is no need to
reconfigure a new IP address each time you want a different computer (as you would with Port Forwarding)
to use the application.
12.6.1 Two Points To Remember About Trigger Ports
1. Trigger events only happen on data coming from inside the ZyWALL to the outside.
2. If an application needs a continuous data stream, that port (range) will be tied up so that another
computer on the LAN can’t trigger it.
Only one LAN computer can use a trigger port (range) at a time.
Enter 3 in menu 15 to display Menu 15.3 — Trigger Port Setup, shown next.
Figure 12-24 Menu 15.3—Trigger Port Setup
Menu 15.3 - Trigger Port Setup
Incoming
Trigger
Rule
Name
Start Port End Port Start Port End Port
----------------------------------------------------------------------
1. Real Audio
6970
7170
7070
7070
2.
0
0
0
0
3.
0
0
0
0
4.
0
0
0
0
5.
0
0
0
0
6.
0
0
0
0
7.
0
0
0
0
8.
0
0
0
0
9.
0
0
0
0
10.
0
0
0
0
11.
0
0
0
0
12.
0
0
0
0
Press ENTER to Confirm or ESC to Cancel: