Trigger Port Forwarding Example; Two Points To Remember About Trigger Ports - ZyXEL Communications LTE5366 Series User Manual

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.

10.6.4 Trigger Port Forwarding Example

The following is an example of trigger port forwarding.
Figure 64 Trigger Port Forwarding Process: Example
Jane requests a file from the Real Audio server (port 7070).
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Port 7070 is a "trigger" port and causes the LTE5366 to record Jane's computer IP address. The LTE5366
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associates Jane's computer IP address with the "incoming" port range of 6970-7170.
The Real Audio server responds using a port number ranging between 6970-7170.
3
The LTE5366 forwards the traffic to Jane's computer IP address.
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Only Jane can connect to the Real Audio server until the connection is closed or times out. The LTE5366
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times out in three minutes with UDP (User Datagram Protocol), or two hours with TCP/IP (Transfer Control
Protocol/Internet Protocol).

10.6.5 Two Points To Remember About Trigger Ports

Trigger events only happen on data that is coming from inside the LTE5366 and going to the outside.
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If an application needs a continuous data stream, that port (range) will be tied up so that another
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computer on the LAN can't trigger it.
Chapter 10 NAT
LTE5366 Series User's Guide
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