ZyXEL Communications Nebula LTE3301-PLUS User Manual page 199

Figure 126 Trigger Port Forwarding Process: Example
Jane requests a file from the Real Audio server (port 7070).
1
Port 7070 is a "trigger" port and causes the Zyxel Device to record Jane's computer IP address. The Zyxel
2
Device associates Jane's computer IP address with the "open" port range of 6970 – 7170.
The Real Audio server responds using a port number ranging between 6970 – 7170.
3
The Zyxel Device forwards the traffic to Jane's computer IP address.
4
Only Jane can connect to the Real Audio server until the connection is closed or times out. The Zyxel
5
Device times out in 3 minutes with UDP (User Datagram Protocol) or 2 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.
Note: TCP port 7547 is reserved for system use.
Note: The sum of trigger ports in all rules must be less than 1000 and every open port range
must be less than 1000. When the protocol is TCP/UDP, the ports are counted twice.
Figure 127 Network Setting > NAT > Port Triggering
The following table describes the labels in this screen.
Table 73 Network Setting > NAT > Port Triggering
LABEL DESCRIPTION
Add New Rule Click this to create a new rule.
# This is the index number of the entry.
Status This field displays whether the port triggering rule is active or not. A yellow bulb signifies that this
rule is active. A gray bulb signifies that this rule is not active.
Service Name This field displays the name of the service used by this rule.
Chapter 11 Network Address Translation (NAT)
Nebula Mobile Router User's Guide
199