Hybrid IT/OT Security Zone Layout Using Deep Packet Inspection
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Solution Overview
Problem
There is a need for a robust technique to automatically lay out security zone policies for Information Technology (IT) and Operational Technology (OT) devices in a hybrid enterprise network, which includes both an IT segment and an OT segment, to enhance security and network visibility.
Innovation Solution
Deep packet inspection is performed to identify network devices within the hybrid enterprise network, determining their segment type (IT or OT) based on physical network addresses, data types, and network protocols. A network hierarchy is generated, mapping IT and OT levels, and security zones are set up with corresponding policies, which are displayed to users for manipulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual security zone policy configuration is used for hybrid IT/OT networks, then security control precision can be maintained, but system complexity and time consumption increase significantly
Solution Approach 1:
The system performs automatic device identification, classification, and security zone assignment without requiring manual intervention. The network device autonomously captures packets, extracts features, determines device types (IT/OT), and configures security policies automatically, eliminating the need for manual configuration while maintaining precision through automated deep packet inspection and classification algorithms
Solution Approach 2:
The system performs preliminary device identification and classification by analyzing network packets and device features before security zone configuration is needed. By pre-determining device types and assigning them to appropriate security zones in advance, the system simplifies subsequent security policy implementation and reduces on-demand configuration complexity
2Measurement precision
If automatic device identification is implemented through deep packet inspection, then device classification accuracy improves, but processing time and computational resources increase
Solution Approach 1:
The system extracts only the most critical features from network packets (source/destination addresses, ports, protocols, payload characteristics) rather than analyzing complete packet contents. This partial analysis approach achieves sufficient classification accuracy for IT/OT device differentiation while significantly reducing processing time and computational overhead compared to full packet inspection
Solution Approach 2:
The system transforms raw packet data into standardized feature parameters (address formats, protocol types, port ranges) that facilitate rapid comparison and classification. By changing the representation of packet information into structured parameters, the system enables faster processing while maintaining classification accuracy through consistent parameter extraction and matching against known device profiles
3Reliability
If network segmentation into multiple security zones is implemented, then security enforcement capability is improved, but network management complexity increases
Solution Approach 1:
The system automatically performs device classification, security zone assignment, and policy configuration without requiring manual network management intervention. The automated system continuously monitors network traffic, identifies new devices, classifies them as IT or OT, and assigns appropriate security policies, thereby maintaining strong security enforcement while eliminating the operational burden of manual zone management
Solution Approach 2:
The system provides a unified automated platform that handles multiple security management functions simultaneously: device identification, classification, zone assignment, and policy configuration. This multi-functional approach simplifies network management by consolidating what would otherwise require separate manual processes into a single automated system that manages the entire security zone lifecycle
Data Source
AI summary
From deep packet inspection, it is determined whether each of the plurality of network devices is part of the IT segment or the OT segment by examining a physical network address, a data type and a network protocol of one or more of the network packets. A network hierarchy is dynamically generated that maps the IT segment with interconnected IT levels having IT devices relative to the OT segment with interconnected OT levels having OT devices. A plurality of security zones is set up from the IT layout and the OT layout. Each of the plurality of security zones has a corresponding one or more security zone policies. The network hierarchy is output and overlaid with the plurality of security zones for display to a user.