TRENDnet TEW-671BR - Manual (Page 41)

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Remove Port Triggering
If you want to remove Special Application settings from the "Current Trigger-Port
Table", select the Port Triggering settings you want to remove in the table and then
click Delete Selected. If you want remove all Port Triggering settings from the table,
just click the Delete All button. Click Reset will clear your current selections.
8.5. Application Layer Gateway (ALG)
You can select applications that need ALG support. The router will let the selected application
to correctly pass through the NAT gateway.