Figure 52 Trigger Port Forwarding Process: Example
1Jane requests a file from the Real Audio server (port 7070).
2Port 7070 is a “trigger” port and causes the Prestige to record Jane’s computer IP address. The Prestige associates Jane's computer IP address with the "incoming" port range of
3The Real Audio server responds using a port number ranging between
4The Prestige forwards the traffic to Jane’s computer IP address.
5Only Jane can connect to the Real Audio server until the connection is closed or times out. The Prestige times out in three minutes with UDP (User Datagram Protocol), or two hours with TCP/IP (Transfer Control Protocol/Internet Protocol).
12.6.2Two Points To Remember About Trigger Ports
1Trigger events only happen on data that is going coming from inside the Prestige and going to the outside.
2If 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.
12.7 Configuring Trigger Port Forwarding
To change your Prestige’s trigger port settings, click SUA/NAT and the Trigger Port tab. The screen appears as shown.
Note: Only one LAN computer can use a trigger port (range) at a time
139 | Chapter 12 Network Address Translation (NAT) Screens |