The localOutFilter is the third filter point which applies to any IP packet that will be transmitted from the router to the medium associated with the interface, regardless of its source, destination, or what type of decision was made to cause the datagram to be transmitted on this interface. localOutFilter generally used to ensure that certain paterns of traffic do not enter the network or reach a second IP router on that network. For example, localOutFilter can be used as the exclusion of all IP packets above a certain security classification, or collecting statistics on the amount of IP fragments performed on an outgoing interface.