Chapter 6 Network Address Translation (NAT)
PMG5318-B20B User’s Guide
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Figure 29 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 GPON Device to record Jane’s computer IP address. The
GPON 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 GPON 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
GPON Device times out in three minutes with UDP (User Datagram Protocol) or two hours with TCP/
IP (Transfer Control Protocol/Internet Protocol).
Click Advanced Setup > NAT > Port Triggering to manage your GPON Device’s trigger port
settings.
Figure 30 Port Triggering
Table 25 Port Triggering
LABEL DESCRIPTION
Add Click this to create a new rule.
Remove Select entries and click the Remove button to delete them.
# 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.
Application
Name
This field displays the name of the service used by this rule.
Trigger Protocol This is the trigger transport layer protocol.
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