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Software defined networking (SDN) isa evolving technology which completely alters the architecture and working of legacynetworks.

There has been rising firmness among networking designers to come upwith a new set of devices to support Software Defined Networks and to implementbetter services in SDN related to legacy networks. During these accomplishments,security of the packets in the SDN networks derives into argument. Software-Defined Network (SDN) splits networkdevice’s control logic from its forwarding logic. Forwarding logic is kept withthe device, whereas control logic is implemented as a piece of software at acentral controller.Communication between controller andforwarding devices is carried out through southbound application program interface, one of such API is OpenFlow protocol. Being located centrally, the controlleris able to have a total view of the network that progresses its policymakingprocess.

It comforts network administrators to easily program whole network. Problems,such as configuration issues, detection and mitigation of attacks, and newprotocol employment for legacy network devices, that took a lengthy time todetect and resolve are now solved within hours with SDN.With all these rewards,SDN has paying attention maximum of the networking scholars and businesses. ThoughSDN carries several benefits in the era of networking, there are certain tasks  that need to be undertook to install it appropriately.

One of these tasks that are troubling everybody to adapt SDN technology is securityissue. It has got more attention from academia as well as businesses.In last years, legacynetworks have been regularly troubled by Distributed  Denial of Service (DDoS) attacks. It   acquiredthe attention of researchers towards this issue.

 Being centrally organised, DDoS in SDN becomesmuch larger problem than in legacy network, as absence of the single controllermight simply interrupt complete network management. Some of the Attack points in SDN are: 1.     ControlPlane2.     SouthboundAPI3.     DataPlane4.     ApplicationPlane 

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