  Condominium network refers to intra-organization networks, where smart
buildings or apartments are connected and share resources over the network.
Secured communication platform or channel has been highlighted as a key
requirement for a reliable condominium which can be ensured by the utilization
of the advanced techniques and platforms like Software-Defined Network (SDN),
Network Function Virtualization (NFV) and Blockchain (BC). These technologies
provide a robust, and secured platform to meet all kinds of challenges, such as
safety, confidentiality, flexibility, efficiency, and availability. This work
suggests a distributed, scalable IoT-SDN with Blockchain-based NFV framework
for a smart condominium (DistB-Condo) that can act as an efficient secured
platform for a small community. Moreover, the Blockchain-based IoT-SDN with NFV
framework provides the combined benefits of leading technologies. It also
presents an optimized Cluster Head Selection (CHS) algorithm for selecting a
Cluster Head (CH) among the clusters that efficiently saves energy. Besides, a
decentralized and secured Blockchain approach has been introduced that allows
more prominent security and privacy to the desired condominium network. Our
proposed approach has also the ability to detect attacks in an IoT environment.
Eventually, this article evaluates the performance of the proposed architecture
using different parameters (e.g., throughput, packet arrival rate, and response
time). The proposed approach outperforms the existing OF-Based SDN. DistB-Condo
has better throughput on average, and the bandwidth (Mbps) much higher than the
OF-Based SDN approach in the presence of attacks. Also, the proposed model has
an average response time of 5% less than the core model.
