A type of port forwarding where outbound traffic on
predetermined ports sends inbound traffic to specific incoming
ports. Port triggering "triggers" an open incoming port when a
client on the local network makes an outgoing connection to a
predetermined port on a server. Port Triggering is more secure
than port forwarding, because the incoming ports are not open
all the time, they are open only when a program is actively
using the trigger port. One major advantage of port triggering
is that it allows computers behind a NAT-enabled router to
provide services which would normally require a static host (one
with an unchanging network address). The disadvantage of port
forwarding is that it only allows one client on the network to
use a particular service that occupies a particular port.
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