ZyXEL NBG6503 User Guide - Page 122
Trigger Port Forwarding Example, Two Points To Remember About Trigger Ports
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Chapter 14 Network Address Translation (NAT) 14.5.1 Trigger Port Forwarding Example The following is an example of trigger port forwarding. Figure 86 Trigger Port Forwarding Process: Example Router Router 1 Jane requests a file from the Real Audio server (port 7070). 2 Port 7070 is a "trigger" port and causes the Router to record Jane's computer IP address. The Router 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 Router 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 Router times out in three minutes with UDP (User Datagram Protocol), or two hours with TCP/IP (Transfer Control Protocol/Internet Protocol). 14.5.2 Two Points To Remember About Trigger Ports 1 Trigger events only happen on data that is going coming from inside the Router and going 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. 122 NBG6503 User's Guide