Two Points To Remember About Trigger Ports - ZyXEL Communications NBG6616 User Manual

Port 7070 is a "trigger" port and causes the NBG6616 to record Jane's computer IP address. The
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NBG6616 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.
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The NBG6616 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
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NBG6616 times out in three minutes with UDP (User Datagram Protocol), or two hours with TCP/IP
(Transfer Control Protocol/Internet Protocol).

14.5.5 Two Points To Remember About Trigger Ports

Trigger events only happen on data that is coming from inside the NBG6616 and going to the
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outside.
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 14 NAT
NBG6616 User's Guide
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