Topic starter
24/10/2026 8:49 pm
TL;DR: Static segmentation policies age quickly as device inventories, IP addresses, and traffic patterns change, Asimily warns. Segmentation enforcement can then drift out of step with live network conditions, weakening containment and making stale rules harder to spot.
Editorial analysis by NHI Mgmt Group, based on content published by Asimily: “Continuous Segmentation is Your Best Defense Against Modern Attacks”.
By the numbers:
- 79% of organizations called segmentation a priority, according to Asimily.
- 33% had fully implemented it, according to Asimily.
- 87% said their approach needs improvement, according to Asimily.
Key questions
Q: Why does device drift increase segmentation risk in IoT and OT networks?
A: Device drift changes the facts segmentation depends on, including IP address, function, and risk posture.
Q: How do security teams know if identity-based segmentation is actually working?
A: Teams should test whether a compromised or simulated compromised host can reach anything beyond the minimum required set of services.
Q: What breaks when segmentation policies are too broad or too static?
A: Broad or static policies often leave more connectivity open than teams realise, which weakens containment and creates blind spots during incidents.
Practitioner guidance
- Define segments by device intent, not static host lists Use device type, function, manufacturer, and risk profile as the policy basis so the segment can survive IP changes and hardware churn.
- Feed NAC with live visibility and risk context Connect passive monitoring, safe scanning, and exploitability analysis to the segmentation workflow so policy decisions reflect current conditions.
- Automate policy removal when devices no longer qualify Revoke prior NAC policies automatically when a device changes role, firmware state, or behavior so stale access does not persist.
Bottom line: Static segmentation policies age quickly when device inventories, IP addresses, and traffic patterns change faster than humans can review them.
Glossary terms: Continuous Segmentation, Network access control, Dacls, Policy Drift Detection
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This topic was modified 7 days ago by NHI Mgmt Group
25/10/2026 11:11 am
Policy drift is the real failure mode in modern segmentation. The issue is not whether segmentation exists, but whether the enforced boundary still matches the live device estate. When device membership, IPs, or operating state change, static rules decay into historical artefacts. Practitioners should treat drift detection as a governance control, not an afterthought.
A question worth separating out:
Q: What should teams do when segmentation depends on firewall or NAC rules?
A: They should treat rule maintenance as part of the control itself, not a separate admin task. When address changes, role changes, or reclassification occur, the policy must be re-evaluated and re-applied automatically or the segmentation model will fail under routine network change.
👉 Read our full editorial: Continuous segmentation closes the drift gap in device networks
This post was modified 7 days ago by NHI Mgmt Group