Chapter 11 Network Address Translation (NAT)
SBG3500-N Series User’s Guide
209
For example:
Figure 88 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 SBG3500-N Series to record Jane’s computer IP
address. The SBG3500-N Series 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 SBG3500-N Series 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
SBG3500-N Series 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 SBG3500-N Series’s trigger port settings.
Figure 89 Network Setting > NAT > Port Triggering
The following table describes the labels in this screen.
Table 57 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.
WAN Interface This field shows the WAN interface through which the service is forwarded.
Trigger Start
Port
The trigger port is a port (or a range of ports) that causes (or triggers) the SBG3500-N
Series 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.
Trigger End
Port
This is the last port number that identifies a service.
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