Nozomi Networks + Elisity: OT/IoT Visibility and Microsegmentation Integration

Your OT security platform detects a Modbus device behaving anomalously on a production subnet. What is it? A PLC, an HMI, a sensor? What firmware is it running? Who configured it, and when? Without those answers, your team can see the threat but can’t scope the blast radius or write a containment policy. That’s the gap in most OT environments: threat detection tools surface alerts, but the device context needed to act on them lives in a different system, or doesn’t exist at all. Explore OT segmentation strategies to close that gap.

Nozomi Guardian and Nozomi Vantage passively monitor your network traffic using deep packet inspection across 100+ OT and IoT protocols, from Modbus and BACnet to EtherNet/IP and OPC UA. Every device gets profiled: type, manufacturer, model, operating system, firmware version. That device intelligence flows directly into Elisity IdentityGraph through a simple API connection, where it becomes the foundation for microsegmentation policies. Your team doesn’t have to manually correlate data across platforms. Nozomi identifies what’s on your network and what it’s doing. Elisity uses that context to control what each device is allowed to reach.

A Siemens S7-300 PLC installed in 2009 doesn’t accept endpoint agents. Neither does the Allen-Bradley ControlLogix running your packaging line, or the BACnet controller managing HVAC across three buildings. These devices weren’t designed for security. They were designed to run for 20 years without interruption, and that’s exactly what they’re doing. You can’t patch them. You can’t install software on them. And Nozomi’s behavioral monitoring tells you they’re talking to devices and subnets they have no business reaching.

Elisity enforces least-privilege policies at the network edge, through your existing switches, without touching the devices themselves. When Nozomi’s device profiling identifies that S7-300 as a legacy PLC running firmware from 2012, Elisity IdentityGraph classifies it into the appropriate policy group and restricts its communication to only the devices and subnets it needs. North-south and east-west. If that PLC starts reaching outside its normal traffic pattern (something Nozomi’s behavioral monitoring would flag), your segmentation policy has already limited the blast radius. No agents installed. No hardware added. No production downtime.

You’ve invested in Nozomi to monitor threats and profile devices across your OT environment. But if it takes 18 months and a forklift network upgrade to act on what Nozomi finds, you’re paying for visibility without enforcement. IEC 62443 requires zone and conduit segmentation. Your auditor doesn’t care that you can see the devices if you can’t prove you’re controlling traffic between zones.

Connect Nozomi to Elisity IdentityGraph by entering your API credentials in the Elisity Cloud Control Center. It takes minutes. Once connected, every device Nozomi has profiled starts enriching your IdentityGraph immediately: device type, manufacturer, model, OS, firmware version. From there, you build policy groups based on real device attributes instead of IP ranges or VLAN assignments. Most teams go from API connection to enforced microsegmentation policies in weeks, not the 18 months a traditional VLAN redesign would take. Your existing switches do the enforcement. No new hardware. No network redesign. And every device Nozomi discovers going forward automatically flows into your policy framework.