ICS Deep Packet Inspection (DPI)
What is ICS Deep Packet Inspection (DPI)?
ICS Deep Packet Inspection decodes industrial protocols at the application layer to validate semantics, enforce command policy, and detect unsafe or unauthorized operations—far beyond simple port/IP filtering.
Examples
- An inline sensor blocks a Modbus write command to a PLC because the function code and register range aren’t on the approved allowlist for that device.
- A passive sensor flags an IEC-104 control command from an unexpected source and outside the normal polling window.
Discover 🔎
Generic firewalls and IDS see ports and IPs; ICS DPI understands the language of the plant. By parsing protocols like Modbus, DNP3, IEC 60870-5-104, IEC 61850 MMS/GOOSE, EtherNet/IP (CIP), PROFINET, OPC UA, BACnet, and Siemens S7, DPI can tell reads from writes, validate command parameters, and enforce policy tied to the process. Done well, DPI provides high-fidelity detection and precise control with minimal disruption to deterministic traffic.
Summary 📝
ICS DPI brings process awareness to network defense. By decoding industrial protocols and enforcing precise, device-level command policy, it can stop dangerous actions while providing rich visibility for forensics and compliance. Success depends on careful placement, realistic latency budgets, disciplined allowlists, and ongoing tuning as the plant evolves.
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