Securing Your OT Network In 2025: A Guide NIS2 & IT/OT segmentation
The NIS2 Directive requires manufacturers to strengthen their OT cybersecurity. This 12-page guide provides practical guidance on how to secure your OT network, including IT/OT segmentation, Zero Trust, OpenVPN/IPSec VPNs, the IEC 62443 standard, and a compliance checklist.
Understanding the NIS2 Requirements Specific to Your Industry
Implementing IT/OT Segmentation in Practice
Securing Remote Access to PLCs (Zero Trust OT)
Mapping NIS2 to IEC 62443 to Simplify Compliance
Complete Checklist: 47 Items to Review Before the Audit
12
Pages
47
Checklist Items
6
OT Frameworks
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White Paper — 12 pages — Free PDF
Securing Your OT Network in 2025:
NIS2 Guide & IT/OT Segmentation
Sommaire
01
Introduction
The OT Cybersecurity Threat Landscape in 2025 — Statistics and Industry Trends
02
NIS2 Explained
Scope, requirements, deadlines, penalties. Who is affected in the manufacturing sector?
03
Zero Trust Architecture
Fundamental Principles and Implementation in Industrial Networks
OpenVPN vs. IPSec for the OT — Performance, Security, Deployment
06
IEC 62443
Mapping NIS2 ↔ IEC 62443 — How to Use the Standard for Compliance
+6
... and 6 more chapters in the full document
12
pages
4
frameworks
1
PDF checklist
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October 2024
Implementation of NIS2 in France
10M€
Maximum Penalty for Defaulting OESs
87%
Increase in OT Attacks in 2024
3.2M€
Average Cost of an OT Incident
WHITE PAPER TABLE OF CONTENTS
What You'll Learn in This Guide
12 pages packed with information, no fluff, written by engineers who deploy Eziwan on real industrial networks. Each chapter includes practical recommendations that can be applied immediately.
01
The OT Cybersecurity Threat Landscape in 2025
Attacks on industrial networks increased by 87% in 2024
Sectors most targeted: energy, water, manufacturing
Main attack vectors: unsecured remote access, OT phishing
Average cost of a cyber incident: €3.2 million in Europe
02
The NIS2 Directive Explained to Industry Leaders
Who is affected: OES and DSP, including the following sectors
The 10 Safety Requirements of Article 21
Notification deadlines: 24 hours, 72 hours, 30 days
Penalties: up to €10 million or 2% of global revenue
Personal Liability of Executives
03
Zero Trust Architecture for OT Networks
Zero Trust Principles Applied to the Industrial Environment
Strong Authentication for Remote OT Access
Micro-segmentation with no impact on PLCs
Monitoring North-South and East-West Flows
04
Practical IT/OT Segmentation: From Theory to Practice
The Purdue Model Revisited for 2025
Industrial DMZ: What It Should and Should Not Contain
VLAN vs. Application Firewall for OT Segmentation
Case Study: A plant with 200 pieces of equipment, segmented over 3 weeks
05
Industrial VPN: OpenVPN vs. IPSec for OT
Performance Comparison: Latency, Throughput, CPU Usage
OpenVPN on a 4G LTE Gateway: Experience Report
Zero Trust Configuration for Remote PLC Access
Audit Logs and Traceability of Industrial Connections
06
IEC 62443: The Industrial Cybersecurity Standard
Structure of the IEC 62443 Standard — What Each Section Covers
Mapping NIS2 ↔ IEC 62443 to Simplify Compliance
Security Level (SL) 1 through 4: Which Level Is Right for Your Site?
How to Use IEC 62443 to Demonstrate Your NIS2 Compliance
And 6 more chapters in the full document:
OT Incident Management, NDR & Anomaly Detection, NIS2 Response Plan, OT Security Policy Template, ANSSI Resource Directory, Comprehensive 47-Point Checklist
Chief Information Security Officers (CISOs) & Chief Information Officers (CIOs) in the Industrial Sector
Understand the NIS2 requirements specific to your industry and develop your compliance roadmap.
Automation & OT Managers
Learn how to secure your OT networks without affecting PLCs or ongoing production.
Executives & CEOs
Understand the risks and personal responsibilities associated with NIS2. Make informed decisions about OT security investments.
Integrators & Consultants
Use this guide to advise your industrial clients on their NIS2 compliance and OT architecture.
EXCERPT — CHAPTER 2
NIS2: Who in the industry is really affected?
The NIS2 (Network and Information Security 2) Directive took effect in October 2024 in the European Union. It significantly expands the scope of the original NIS Directive and introduces stricter requirements for sectors deemed critical.
Unlike NIS1, which primarily targeted large Operators of Essential Services (OES), NIS2 now covers a much wider range of entities, including industrial SMEs in the energy, water, transportation, critical manufacturing, and waste management sectors.
Key point to remember
NIS2 holds executives personally liable for cybersecurity breaches. In the event of a serious breach, penalties may include a temporary ban on holding executive positions. It is no longer just the company that is at stake.