There is disclosed a network device having a network interface; and one or more logic elements comprising a flow table engine operable to: receive a network packet via the network interface; perform a logging action to make the network packet traceable; and notify a software-defined networking (SDN) controller of the logging action via the network interface. There is also disclosed an SDN controller having a network interface; first one or more logic elements comprising a software-defined networking (SDN) controller engine to provide SDN controller services; and second one or more logic elements comprising a route tracing engine, operable to: receive a logging action for a network packet from a network device via the network interface; and update a logging table from the logging action. There is further disclosed a method of providing the foregoing, and computer-readable mediums for providing the foregoing.