Services

OT Network Segmentation

Creating Secure Boundaries Within Industrial Environments to Limit Risk, Contain Threats, and Preserve Uptime

The Challenge

Operational Technology environments are often flat networks—open by design for maximum visibility and control. But in today’s threat landscape, that openness creates a dangerous attack surface. Malware or lateral movement from IT into OT can bypass weak perimeter controls and compromise critical infrastructure. Segmentation is essential—but implementing it in OT environments presents distinct hurdles.

Key challenges include:

      • Lack of visibility into legacy devices and undocumented network paths

      • Limited native support for VLANs, firewalls, or authentication within legacy OT systems

      • High uptime requirements that restrict redesigns or reboots

      • Risk of interrupting operations or breaking communication between systems

      • Difficulty enforcing role-based access or isolating zones without impeding processes

      • Bridging gaps between IT and OT teams when applying segmentation strategies

Without proper segmentation, a single compromised device can expose entire production networks to disruption or sabotage.

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The Solution

Defy Security designs and implements practical, standards-aligned segmentation strategies tailored to OT environments. We start with deep network discovery, mapping communications between assets to understand which systems truly need to talk. Then, we develop and deploy segmentation approaches that reduce risk while keeping operations running smoothly.

Our approach includes:

      • Conducting asset and protocol discovery across your OT network

      • Designing logical and physical segmentation using zones and conduits per ISA/IEC 62443

      • Implementing segmentation with industrial firewalls, demilitarized zones (DMZs), and access control policies

      • Collaborating with operations teams to validate traffic requirements and minimize business disruption

      • Enabling secure remote access strategies that respect segmented architectures

      • Providing ongoing validation to ensure segmentation effectiveness over time

With Defy, OT segmentation becomes a security enabler—not a disruption.

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Segmentation in OT isn’t about blocking—it’s about controlling flow with precision and purpose.

Your Proactive Security Partner

Customers work with Defy Security to simplify their buying experience. We provide initial assessment and analysis of technologies and custom proof of concepts. Our business analysis of licensing and financing structure saves you money. We oversee implementation and operation with staffing and services to ensure success.

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