ZyXEL NBG420N Manuel d'utilisateur télécharger pdf (Page 143)

Chapter 11 Network Address Translation (NAT)

NBG420N User’s Guide

143

Figure 93 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 NBG420N to record Jane’s computer IP

address. The NBG420N 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 NBG420N 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 NBG420N times out in three minutes with UDP (User Datagram Protocol), or

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

11.5.2 Two Points To Remember About Trigger Ports

1 Trigger events only happen on data that is going coming from inside the NBG420N 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.

11.6 NAT Advanced Screen

To change your NBG420N’s trigger port settings, click Network > NAT > Advanced. The

screen appears as shown.

" Only one LAN computer can use a trigger port (range) at a time.

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ZyXEL NBG420N Manuel d'utilisateur Page 143