The increasing number of Internet of Things (IoT) devices in smart homes now offers a high level of efficiency and convenience that we have never seen before. However, this rapid growth also introduces some new challenges related to the security of these systems. To address those challenges, IETF introduced Manufacturer Usage Description (MUD). MUD is a standard that offers a way to specify the network behavior and permissions of devices that are MUD-enabled. To achieve this goal, the MUD standard uses a white-listing approach based on a set of rules (also called policies), written by the device's manufacturer. So, all traffic that is not expressly allowed by the manufacturer is blocked.