Topic starter
24/06/2026 6:58 pm
TL;DR: OT environments are stretching across production systems, industrial networks, robotics, edge systems, cloud platforms, and modern applications, while static firewall rules, VLANs, IP addresses, and manual policy updates are increasingly brittle, according to Corsha. The governance shift is toward identity-driven verification for machine-to-machine communication, where access is continuously checked before traffic is allowed.
Editorial analysis by NHI Mgmt Group, based on content published by Corsha: “title”.
Key questions
Q: What breaks when OT segmentation depends on static network rules?
A: Static OT segmentation breaks when network location is no longer a reliable proxy for trust.
Q: Why does machine identity reduce lateral movement risk in OT?
A: Machine identity reduces lateral movement risk because it forces each machine-to-machine connection to be authorised at the point of communication.
Q: How do security teams know when OT segmentation is becoming unmanageable?
A: The clearest sign is when policy changes become constant just to preserve normal operations.
Practitioner guidance
- Replace subnet trust with machine identity checks Map the OT services that still rely on allowed IP ranges or VLAN membership and identify where machine identity can become the enforcement condition instead.
- Inventory machine-to-machine trust paths Document which systems initiate connections, which systems receive them, and which relationships are currently implied by network placement rather than explicitly authorised.
- Reduce manual segmentation drift Track every firewall or policy change required to preserve production connectivity and flag environments where policy updates are becoming routine maintenance rather than exception handling.
Bottom line: OT segmentation that relies on static rules becomes fragile as connected systems span legacy and modern environments.
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This topic was modified 1 day ago by NHI Mgmt Group
25/06/2026 4:01 am
Static OT segmentation is now a governance liability, not just an architectural shortcut. The article shows that production systems, robotics, edge platforms and cloud services are all being pulled into the same operational fabric. Once that happens, IP-based trust and manual firewall maintenance stop expressing actual machine relationships. Practitioners should treat segmentation as an identity problem when machine communication spans heterogeneous environments.
A few things that frame the scale:
- By 2029, 40% of enterprises that successfully implement zero trust within cloud service provider environments will rely on the advanced visibility and control capabilities offered by CNAPP solutions.
A question worth separating out:
Q: Should OT teams prioritise identity-driven controls over another firewall redesign?
A: Yes, when the environment includes mixed legacy and modern systems that cross multiple operational layers. Another firewall redesign can delay the problem, but it does not change the fact that trust is being inferred from network location instead of machine identity and real-time authorization.
👉 Read our full editorial: Identity-driven OT segmentation is replacing static firewall controls
This post was modified 1 day ago by NHI Mgmt Group