OT Network Segmentation
What is OT Network Segmentation?
OT network segmentation is the practice of dividing industrial networks into smaller, purpose-based zones and connecting them only through controlled conduits to improve safety, reliability, and security.
Examples
- PLCs and I/O for a packaging line are placed in a production zone that can only talk to the HMI/SCADA zone; all other traffic is blocked.
- An OT historian in Level 3 exchanges data with a reporting server in the IDMZ; no enterprise laptop can directly reach controllers.
Discover 🔎
Segmentation limits how far problems can spread. By separating control assets into zones and brokering traffic through defined conduits, you reduce the blast radius of malware, misconfigurations, or operator mistakes. In OT, this protects real-time control from noisy IT services and enables safe data sharing without exposing PLCs, HMIs, or safety systems.
Summary 📝
OT segmentation makes control systems defensible. Separate by function and risk, broker every inter-zone flow, and keep critical OT services local. With precise allowlists, an IDMZ, and disciplined remote access, plants can share data safely while preventing IT incidents or malware from reaching real-time control.
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