OT (Operational Technology) network segmentation aims to limit communications between industrial environments and reduce the risk of an attack spreading in the event of an incident.

In the field, industrial sites often combine several generations of equipment and architectures whose communication logic is not always documented, which makes effective segmentation more complex than it appears.

This guide outlines a seven-step approach:

• Building a complete inventory of the OT environment,
• Identifying the actual flows between devices,
• Defining coherent zones based on the principles of the ISA/IEC 62443 standard,
• Determining authorized communications,
• Accounting for IT/OT connections and remote access,
• Rolling out the rules progressively so production is not interrupted,
• And keeping the network map up to date over time.

📥 Download this guide to discover the 7 concrete steps for effectively segmenting your OT network.