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Chapter 11 NAT
LTE3316-M604 User’s Guide
101
do not need to configure a new IP address each time you want a different LAN computer to use the
application.
11.6.4 Trigger Port Forwarding Example
The following is an example of trigger port forwarding.
Figure 55 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 LTE to record Jane’s computer IP address. The LTE 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 LTE 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 LTE times
out in three minutes with UDP (User Datagram Protocol), or two hours with TCP/IP (Transfer Control
Protocol/Internet Protocol).
11.6.5 Two Points To Remember About Trigger Ports
1 Trigger events only happen on data that is coming from inside the LTE 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.
101


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