ZyXEL Communications 5 Series User Manual

Chapter 22 Network Address Translation (NAT)

ZyWALL 5/35/70 Series User’s Guide

2 Port 7070 is a “trigger” port and causes the ZyWALL to record Jane’s computer IP 

address. The ZyWALL 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 ZyWALL 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 ZyWALL times out in three minutes with UDP (User Datagram Protocol) or 
two hours with TCP/IP (Transfer Control Protocol/Internet Protocol). 

Click ADVANCED > NAT > Port Triggering to open the following screen. Use this screen 
to change your ZyWALL’s trigger port settings.

Figure 258   ADVANCED > NAT > Port Triggering 

The following table describes the labels in this screen. 

Table 134   ADVANCED > NAT > Port Triggering 

WAN 
Interface

Select the WAN interface for which you want to view or configure address mapping 
rules.

#

This is the rule index number (read-only).

Name

Type a unique name (up to 15 characters) for identification purposes. All characters 
are permitted - including spaces.