The flows must be carefully configured, since a mismatch leads to packets being forwarded to OpenFlow controller that may decide to broadcast packets, and lead to a drastic reduced throughput from 941 Mbps to approx. In an OpenFlow network, the switch fol-lows its flow table to make forwarding decisions and rejects its traditional forwarding table. OpenFlow controller is the heart of the OpenFlow network, and in centralized hierarchy it poses a single point of failure and risk of DoS attacks. In this thesis, the integration and benefits of OpenFlow protocol in LAN environment have been analyzed. One of the SDN protocols ‘OpenFlow’ is a normal application layer protocol, which is encapsulated inside TCP, IPv4 and Ethernet format. In SDN, for a single change in network, the network configurations are changed only at central or some specific controller(s) rather than touching individual network devices. Software Defined Networking (SDN) is aimed at surpassing the limits of traditional networking infrastructure and making it a dynamic network. The traditional networking infrastructure is still static in nature due to its complexity, vendor dependence and QoS requirements. The simulation results showed that the proposed mechanism is robust against ARP spoofing attack. Experiments were conducted on the simulated environment using Mininet to check the functionality of the proposed mechanism. In this work, the SDN controller has been extended by a module which checks every ARP packet in network to detect possible spoofed packets and stop them. A light, reliable, fast and effective mechanism has been proposed to prevent ARP spoofing, without any additional software or hardware by utilising SDN capabilities. This paper discusses the attacks of ARP spoofing and presents a deep study on the existing solutions either in traditional or SDN environments. Conventional networks had several security problems, some of them disappeared by SDN and some others still exist such as Address Resolution Protocol ARP spoofing.

It is expected to be a solution to overcome the limitations of traditional networks.

Software Defined Network SDN is a new emerging paradigm of networking which decouples the data plane and the control plane.

Arp poisoning software