Chapter 9 Network Address Translation (NAT)
Figure 66 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 ZyXEL Device to record Jane’s computer IP address. The ZyXEL Device associates Jane's computer IP address with the "incoming" port range of
3The Real Audio server responds using a port number ranging between
4The ZyXEL Device 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 ZyXEL Device times out in three minutes with UDP (User Datagram Protocol), or two hours with TCP/IP (Transfer Control Protocol/Internet Protocol).
9.5.2Two Points To Remember About Trigger Ports
1Trigger events only happen on data that is going coming from inside the ZyXEL Device 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.
9.6 NAT Advanced Screen
To change your ZyXEL Device’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.
| 115 |
ZyXEL | |
|
|