3 posts tagged with "network-segmentation"

The edge gateway sitting on your factory floor is talking to the cloud. It's reading temperature, pressure, and flow data from PLCs over Modbus, packaging it into MQTT messages, and publishing to a broker that might be Azure IoT Hub, AWS IoT Core, or a self-hosted Mosquitto instance. The question isn't whether that data path is valuable — it's whether anyone else is listening.

Industrial MQTT security isn't a theoretical exercise. A compromised edge gateway can inject false telemetry (making operators think everything is fine when it isn't), intercept production data (exposing process parameters to competitors), or pivot into the OT network to reach PLCs directly. This guide covers the practical measures that actually protect these systems.

Industrial security used to mean padlocking the control room and keeping the plant network air-gapped. Those days ended the moment someone plugged a cellular gateway into the PLC cabinet. Now every edge device streaming telemetry to the cloud is an attack surface — and the cryptominer that quietly hijacked your VM last month was the gentle reminder.

This guide covers the practical security mechanisms you need to protect industrial data in transit — MQTT over TLS, certificate management for OPC-UA and cloud brokers, SAS token lifecycle, network segmentation patterns, and what zero-trust actually means when your "users" are PLC gateways running on ARM processors with 256MB of RAM.

There's a persistent myth in manufacturing that "air-gapped" OT networks don't need security. The moment you connect a PLC to an edge gateway that publishes data to the cloud via MQTT, that air gap is gone. You've built a bridge between your operational technology and the internet, and every decision you make about that bridge — TLS configuration, certificate management, authentication, network architecture — determines whether you've built a secure connection or an open door.

This guide covers the practical security decisions for IIoT deployments, based on hard-won experience connecting industrial equipment in environments where a misconfiguration doesn't just leak data — it can affect physical processes.