ZyXEL P-2302R Bedienungsanleitung PDF herunterladen (Seite 140)

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P-2302R Series User’s Guide

139 Chapter 12 Network Address Translation (NAT) Screens

Figure 52 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 Prestige to record Jane’s computer IP address.

The Prestige 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 Prestige 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 Prestige times out in three minutes with UDP (User Datagram Protocol), or two

hours with TCP/IP (Transfer Control Protocol/Internet Protocol).

12.6.2 Two Points To Remember About Trigger Ports

1 Trigger events only happen on data that is going coming from inside the Prestige 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.

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

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