Software-Defined Data Flow Detection and Control Approach for Industrial Modbus/TCP Communication

Abstract

There is an increasing consensus that software-defined networking may become a successful case to provide fine scalability and availability for industrial Internet, and it also brings new opportunities for the development of industrial cyber security. Aligning with the defense in depth strategy, this paper proposes a software-defined data flow detection and control approach for industrial Modbus/TCP communication. Furthermore, this approach designs a novel security strategy configuration service in SDN controllers to publish the flow control rules, and SDN switches match Modbus/TCP data flows with these flow control rules to detect and control abnormal communication behaviors. Specifically, a flow control rule database which stores all flow control rules of the entire control system is managed by SDN controllers, and a security flow table is maintained by each SDN switch according to different requirements of industrial communication. By using the DPI (Deep Packet Inspection) technology, this approach can run a deep analysis of Modbus/TCP packets according to the protocol specification, and block the improper control commands or undesired technology parameters. The qualitative analysis shows that the proposed approach possesses certain advantages and feasibilities.