International Journal of Core Engineering & Management Volume-5, Issue-8, November-2018, ISSN No: 2348-9510 81 SOFTWARE DEFINED NETWORKS (SDN) BASED WIRELESS NETWORK SECURITY FOR CLOUD INTERNET OF THINGS (IOT) Sai Krishna Reddy Mudhiganti Abstract Nowadays, Internet of things (IoT) is imminent technology which enables billions of devices connected with network to interchange real-time information. With development of smart devices related to Internet, network security is hardest challenges for IoT. Maintaining and securing in heterogeneous and large scale networks is a challenging chore. Thus, Software Defined Networking (SDN) presents numerous opportunities and provides prospective to beat those security challenges. In this paper, SDN framework was proposed for presenting network security in gateways of IoT. An experimental validation of framework is focuses on security problems among all other challenges and results in enforcement of security at network edge. Results of our evaluation shows SDN architecture model can efficiently and effectively meet the security challenges created by the network. Keywords: Internet of Things, Software Defined Networks, Network Security. I. INTRODUCTION Currently, over seven billion customers in the world are linked to the Internet for browsing Web pages, accessing e-commerce services, sending and reading emails, sharing experience on social media and playing games. The wide-scale diffusion of the Internet has been the driving potency of an emerging trend, the utilization of such world-wide interaction infrastructure to allow machineries and smart stuffs to communicate, collaborate and create verdicts on real- world circumstances. This auspicious exemplar is recognized as the “Internet of Things” (IoT) and its progression goes hand-in-hand with the advancement of supporting technologies addressed to this novel hallucination of wireless interaction scenario, like wearable sensors, Wireless Sensor Networks (WSNs), NFC, actuators, FID, and Machine-to-Machine (M2M) devices. The word IoT was utilized for the initial time in the late 1990s by the entrepreneur Kevin Ashton, one of the inventers of Auto-ID Centre at MIT, represents to the connection of stuffs to the Internet by RFID tags (Madakam et al., 2015). The utilization of IoT allowed technologies discovers a great use for securing crucial infrastructure, like a bank, a stadium, an energy production infrastructure, a harbor or other community ambient. RFID or other identification technologies can detect if a person is authorized to stay within a restricted area. Tewari and Gupta (2018) presents IoT Cross layer heterogeneous integration issues, I2NSF architecture(Hyun et al., 2018), an integrated Cloud-Fog architecture(Peng et al., 2018), CoAP in