ZyXEL Communications SBG3500-N000 User Manual page 212

Chapter 11 Network Address Translation (NAT)
For example:
Figure 79 Trigger Port Forwarding Process: Example
Jane requests a file from the Real Audio server (port 7070).
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Port 7070 is a "trigger" port and causes the Device to record Jane's computer IP address. The
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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.
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The Device forwards the traffic to Jane's computer IP address.
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Only Jane can connect to the Real Audio server until the connection is closed or times out. The
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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 Device's trigger port settings.
Figure 80 Network Setting > NAT > Port Triggering
The following table describes the labels in this screen.
Table 57 Network Setting > NAT > Port Triggering
LABEL
Add new rule
#
Status
Service Name
WAN Interface
Trigger Start
Port
Trigger End
Port
Trigger Proto.
212
DESCRIPTION
Click this to create a new rule.
This is the index number of the entry.
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.
This field displays the name of the service used by this rule.
This field shows the WAN interface through which the service is forwarded.
The trigger port is a port (or a range of ports) that causes (or triggers) the Device to record
the IP address of the LAN computer that sent the traffic to a server on the WAN.
This is the first port number that identifies a service.
This is the last port number that identifies a service.
This is the trigger transport layer protocol.
SBG3500-N000 User's Guide