ZyXEL Communications G-2000 Plus 10.7 Configuring Trigger Port Forwarding, 10.6.2Two Points To Remember About Trigger Ports, SUA/NAT, Trigger Port

ZyAIR G-2000 Plus User’s Guide

Figure 60 Trigger Port Forwarding Process: Example

1Jane requests a file from the Real Audio server (port 7070).

2Port 7070 is a “trigger” port and causes the ZyAIR to record Jane’s computer IP address. The ZyAIR associates Jane's computer IP address with the "incoming" port range of 6970-7170.

3The Real Audio server responds using a port number ranging between 6970-7170.

4The ZyAIR forwards the traffic to Jane’s computer IP address.

5Only Jane can connect to the Real Audio server until the connection is closed or times out. The ZyAIR times out in three minutes with UDP (User Datagram Protocol), or two hours with TCP/IP (Transfer Control Protocol/Internet Protocol).

10.6.2Two Points To Remember About Trigger Ports

1Trigger events only happen on data that is going coming from inside the ZyAIR and going to the outside.

2If 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.

10.7 Configuring Trigger Port Forwarding

To change your ZyAIR’s trigger port settings, click SUA/NAT and the Trigger Port tab. The screen appears as shown.

Note: Only one LAN computer can use a trigger port (range) at a time

149 Chapter 10 Single User Account (SUA) / Network Address Translation (NAT)