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5.2 Port Triggering
Port range triggering opens a predetermined incoming port
for a limited period of time whenever a client on the local area
network makes an outgoing connection to a specied port. Port
triggering is used in the following scenarios:
More than one local client needs port forwarding for the
same application at a dierent time.
An application requires specic incoming ports that are
dierent from the outgoing ports.