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Software Defined Networking (SDN), has introduced many advanced platforms formanaging networks and adopting different security tools with them, but the costof these platforms should be considered as well. In this paper, we present anextension of the existing approach to the optimal placement of virtual securityappliances in a pre-defined network setting. The approach proposed by Bouet [1]only considered one security appliance, we extended his approach to severalvirtual security appliances. We conducted several simulation tests showing goodperformances of our approach. To show the feasibility, we implemented ourapproach using SDN and virtual security appliances and integrated it intoOpenStack. This extension adapts UFLP algorithm to real world situations whereseveral middle boxes need to be deployed to satisfy security needs for theapplications deployed in the cloud. We realized this approach by implementing"OpenStack on top of OpenStack" , a nested OpenStack implementation withOpenDayLight as the SDN controller .

A Cost-based Placement Algorithm for Multiple Virtual Security  Appliances in Cloud using SDN: MO-UFLP(Multi-Ordered Uncapacitated Facility  Location Problem)