ZyXEL NBG-417N User Guide - Page 112
Trigger Port Forwarding Example, 10.5.2 Two Points To Remember About Trigger Ports,
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Chapter 10 Network Address Translation (NAT) Table 49 Network > NAT > Advanced LABEL DESCRIPTION End Port Type a port number or the ending port number in a range of port numbers. Trigger The trigger port is a port (or a range of ports) that causes (or triggers) the NBG417N to record the IP address of the LAN computer that sent the traffic to a server on the WAN. Start Port Type a port number or the starting port number in a range of port numbers. End Port Type a port number or the ending port number in a range of port numbers. Apply Click Apply to save your changes back to the NBG-417N. Reset Click Reset to begin configuring this screen afresh. 10.5.1 Trigger Port Forwarding Example The following is an example of trigger port forwarding. Figure 74 Trigger Port Forwarding Process: Example 1 Jane requests a file from the Real Audio server (port 7070). 2 Port 7070 is a "trigger" port and causes the NBG-417N to record Jane's computer IP address. The NBG-417N 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 NBG-417N 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 NBG-417N times out in three minutes with UDP (User Datagram Protocol), or two hours with TCP/IP (Transfer Control Protocol/Internet Protocol). 10.5.2 Two Points To Remember About Trigger Ports 1 Trigger events only happen on data that is going coming from inside the NBG-417N and going to the outside. 112 NBG-417N User's Guide