## 8 Future Directions
Such attacks are brought about by the inclusion of receptive principles as opposed to embracing a proactive methodology. They can be averted by utilizing different controllers. Different threats may originate from disseminated multi-controllers, applications, unlawful access, or clashes of security rules or arrangements. In spite of existing arrangements, high portability requires security components that can perform continuous validation. In addition, dormancy can cause traffic jams that hinder the acknowledgment of SDN-based VANETs. This ongoing element builds trouble in fortifying security [59; 60]. The attacks, for example, evolving path, merger, rushing or braking, diverting traffic or altering course could be done. In SDN-based VANET models, the controller can introduce the suitable principles identified with the increasing speed/deceleration, merger/parting, and changing path considering contributions from traffic conditions and occasions in the streets. At that point a controller could gather data on the roads' status and bizarre vehicle conduct by utilizing traded information. Specifically, components, for example, the ones conveyed in another study [84] can be effective to distinguish a rowfulness in platooning SDN-based VANET applications. So as to guarantee better system usage, the RSU controllers in the SDN-based VANET applications and programs have the job to educate the detachment chief to set various limitations. These limitations incorporate the booking approach of information, increasing speed, or braking. Moreover, SDN-based RSU controllers could recognize the attacks, for example, sticking, replay, or the attacks focusing on the administration conventions. These types of the attacks instigate moves, for example, parting, consolidating, or path evolving. In SDN-based VANET based structures, an attacker could noxiously inject a product that imitates itself by the various SDN-based controllers and vehicles and the switches. The remote attacker by Bluetooth or cell correspondences enables the aggressor to assume responsibility for the vehicle. One of the weakness disorders lives on the absence of the information verification of the controller region position. The versatility the executives in VANETs builds the delay in disseminating the information where the handover techniques are not appropriately actualized. To this, SDN-based VANETs with haze figuring would permit competition of the prerequisites of the lowest information dissemination delays by receiving a cross breed handover conspire, improving radio asset distribution by Markov choice procedure [154]. However, wasteful controls for the highest portability that matter, flimsy remote channels for SDN put together VANETs, and inactivity with respect to the appropriation of directions from the controllers and the interworking break by the heterogeneous systems between continuous VANETs make it difficult to fight through SDN-based VANETs. Furthermore, arrange edge computing and NFV [155] in SDN-based VANETs present potential research openings. Indeed, SDN permits employable system edge computing in unique topologies. NFV by the utilization of the hypervisor has the assignment of altering OpenFlow rules in the manner to empower the heterogeneous system interworking. The framework investigation of SDN-based VANET systems distinguishes parts, structures, and conventions straightforwardly connected to the SDN-based VANET. There are six design frameworks of SDN-based IoV developed in writing: SDN-based VANETs [22], SDN-based directing [156], SDN-based VANETs [157], SDN-based cloud-fog/versatile (fog/edge) processing, and programming characterized VANETs [158]. A complete investigation of SDN-based VANETs, its advantages and administrations are depicted elsewhere [59]. Albeit six frameworks of SDN-based VANET designs are as of now executed and recreated, framework examination gives bits of knowledge to important parts, structures, conventions, and reenactment devices to be considered before giving an answer model to VANET challenges.