ZyXEL Communications WAH7608 - Two Points to Remember about Trigger Ports

Chapter 11 NAT
WAH7608 User’s Guide
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2 Port 7070 is a “trigger” port and causes the WAH7608 to record Jane’s computer IP address. The
WAH7608 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 WAH7608 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
WAH7608 times out in three minutes with UDP (User Datagram Protocol), or two hours with TCP/IP
(Transfer Control Protocol/Internet Protocol).
11.4.5 Two Points To Remember About Trigger Ports
1 Trigger events only happen on data that is coming from inside the WAH7608 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.