Before you can secure your OT network, you have to understand it.

In this episode of the Zeroed-In Podcast, our host Olivier Bloch sits down with Dan Frechette, OT security expert and former member of the CyberX Labs team (now Microsoft Defender for IoT).

Together, they unpack the fundamentals of OT visibility, asset discovery, and passive network monitoring. They also cover how modern tools like Microsoft Defender for IoT help organizations identify risks before attackers exploit them.

Topics Include:

• Why you can’t secure what you don’t know exists

• The critical differences between IT and OT networks

• Real-world OT cyberattacks like TRITON

• How to passively discover every device in your plant network

• Why security may actually bridge IT and OT, not divide them

If you work in manufacturing, utilities, or industrial cybersecurity... this is your crash course in understanding what’s really running on your network, and how to defend it.

Subscribe for more conversations on Industrial IoT, OT Security, and AI in Manufacturing.

⏱ Chapters

00:00 Intro: Understanding OT Infrastructure

01:42 Dan Frechette’s Background in OT Security

03:30 Why You Can’t Secure What You Don’t Know

06:15 The Old “Air Gap” Myth and Why It’s Failing

09:10 IT vs OT: The Two Worlds Explained

13:25 Real OT Attack Stories (TRITON, Oldsmar, etc.)

18:20 How to Map Your OT Network Passively

22:10 Monitoring and Detecting Anomalies

27:15 Defender for IoT: Setup and First Results

31:40 Bridging the IT/OT Divide with Security

36:00 Final Takeaways

🎧 Brought to you by Thing-Zero: Secure. Predict. Augment. Automate.

📌 Follow Olivier Bloch on LinkedIn - https://www.linkedin.com/in/marvin-tansley-a914551/

📌 Follow Dan Frechette on LinkedIn - https://www.linkedin.com/in/dan-frechette/

Follow Thing-Zero on:

- YouTube: YouTube.com/@thing-zero

- Linkedin: linkedin.com/company/thing-zero

- 𝕏: https://x.com/ThingZ96954

- Web: https://www.Thing-Zero.com

#IoT #OT #MicrosoftSecurity #DefenderForIoT #manufacturing