Software Defined Networking (SDN) is one of the most commonly used network architectures in recent years. With the substantial increase in the number of Internet users, network security threats appear more frequently, which brings more concerns to SDN. Distributed denial of Service (DDoS) attacks are one of the most dangerous and frequent attacks in software defined networks. The traditional attack detection method using entropy has some defects such as slow attack detection and poor detection effect. In order to solve this problem, this paper proposed a method of fusion entropy, which detects attacks by measuring the randomness of network events. This method has the advantages of fast attack detection speed and obvious decrease in entropy value. The complementarity of information entropy and log energy entropy is effectively utilized. The experimental results show that the entropy value of the attack scenarios 91.25% lower than normal scenarios, which has greater advantages and significance compared with other attack detection methods.

Software-defined networking is an evolving network architecture beheading the traditional network architecture focusing its disadvantages in a limited perspective. A couple of decades before, programming and networking were viewed as different domains which today with the lights of SDN bridging themselves together. This is to overcome the existing challenges faced by the networking domain and an attempt to propose cost-efficient effective and feasible solutions. Changes to the existing network architecture are inevitable considering the volume of connected devices and the data being held together. SDN introduces a decoupled architecture and brings customization within the network making it easy to configure, manage, and troubleshoot. This paper focuses on the evolving network architecture, the software-defined networking. Unlike a generic view on the evolving network, which makes work as a review, this work addresses various perspectives of the architecture leaving it an intermediate work in between the review of the literature and implementation, contributing towards factors like the design, programmability, security, security behaviors, and security lapses. This paper also analyses various weak points of the architecture and evolves the attack vectors in each plane leaving a conclusion to further progress towards identifying the impacts of the attacks and proposing mitigation strategies.

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A spotlight concept for the researchers in today's technology driven world is Software Defined Networking. Before a few decades, considered as extremely diverged domains, Software and Networking concepts are now converging itself to bring out feasible, effective, cost-efficient and easy solutions to the existing challenges in the networking domain. Due to the arrival of latest user-friendly technologies, IoT applications, the legacy networking domain is facing a drastic and dramatic growth with respect to the size and complexity. This brings in a whole lot of new challenges in managing, controlling and securing the existing legacy networks. Software Defined Networking, because of its decoupled architecture, will be a better alternative approach from the legacy network to provide a feasible solution for the existing challenges. This paper focuses on the existing challenges in the SOHO networks and the available options in Software Defined Networking to overcome the challenges. This paper is designed with an Introduction part describing the challenges in a SOHO Network continued with the pure SDN Architecture following with the industry approach on SDN implementation, SDN Standardization strategies and Cisco ONE SDN Architecture. This paper concludes with a comment on the feasibility of implementing SDN in SOHO networks replacing legacy network.

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