ZyXEL GS-105I User Guide - Page 171

Network Setting > NAT > Port Triggering,

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Chapter 11 Network Address Translation (NAT) Note: The maximum number of open ports for a single rule or all rules is 999. For example: Figure 95 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 Zyxel Device to record Jane's computer IP address. The Zyxel Device associates Jane's computer IP address with the "open" port range of 6970-7170. 3 The Real Audio server responds using a port number ranging between 6970-7170. 4 The Zyxel Device 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 Zyxel Device times out in three minutes with UDP (User Datagram Protocol) or two hours with TCP/IP (Transfer Control Protocol/Internet Protocol). Click Network Setting > NAT > Port Triggering to open the following screen. Use this screen to view your Zyxel Device's trigger port settings. Figure 96 Network Setting > NAT > Port Triggering PX7511-B0 User's Guide 171

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Chapter 11 Network Address Translation (NAT)
PX7511-B0 User’s Guide
171
Note: The maximum number of open ports for a single rule or all rules is 999.
For example:
Figure 95
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 Zyxel Device to record Jane’s computer IP address. The Zyxel
Device associates Jane's computer IP address with the "open" port range of 6970-7170.
3
The Real Audio server responds using a port number ranging between 6970-7170.
4
The Zyxel Device 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 Zyxel
Device times out in three minutes with UDP (User Datagram Protocol) or two hours with TCP/IP (Transfer
Control Protocol/Internet Protocol).
Click
Network Setting > NAT > Port Triggering
to open the following screen. Use this screen to view your
Zyxel Device’s trigger port settings.
Figure 96
Network Setting > NAT > Port Triggering