Manufacturing companies should segment their networks into at least 2–3 core zones, such as IT (business systems), OT (operational/production systems), and secure access layers, to reduce cybersecurity risk and prevent system-wide failures. For companies with 20–100 employees, proper segmentation can reduce ransomware spread risk by 70–90% and significantly limit downtime during incidents.
Without segmentation, a single compromised device (like a user laptop) can spread malware across ERP systems, production networks, and critical infrastructure.
What Is IT vs OT in Manufacturing (Simple Explanation)
Understanding the difference is the first step.
IT (Information Technology)
These are your business systems:
- Email (Microsoft 365, etc.)
- File servers and shared drives
- ERP systems (in some environments)
- CRM and office applications
IT systems support business operations and communication.
OT (Operational Technology)
These are your production systems:
- Machines and PLCs (programmable logic controllers)
- SCADA systems
- Industrial control systems (ICS)
- IoT devices on the factory floor
OT systems directly control production and physical processes.
Key Insight:
IT and OT were traditionally separate but are now increasingly connected, which increases risk.
Why Network Segmentation Is Critical in Manufacturing
Without segmentation, your network is “flat”. Meaning, everything is connected.
What Happens Without Segmentation
- A phishing email infects a user’s computer
- Malware spreads across the network
- ERP systems become compromised
- Production systems are affected
Result: Full operational shutdown
hat Segmentation Does
- Isolates systems from each other
- Limits how far threats can spread
- Protects production environments from IT-based attacks
Key Insight:
Segmentation turns a company-wide disaster into a contained incident.
The 3 Core Network Zones Every Manufacturer Should Have
1.IT Network (Business Systems Zone)
Includes:
- User devices (laptops, desktops)
- Email and cloud systems
- File servers
- Office applications
This is the most exposed layer (internet-facing).
2.OT Network (Production Zone)
Includes:
- Machines and PLCs
- SCADA systems
- Industrial networks
- Production line systems
This must be isolated and tightly controlled.
3.Secure Access Layer (Controlled Bridge)
This acts as a gatekeeper between IT and OT:
- Firewalls and network segmentation tools
- Controlled access to production systems
- Monitoring and logging
Only authorized traffic should move between IT and OT.
What Systems Should Be Segmented (Practical Breakdown)
Segmentation Checklist
ERP Systems
- Isolated from general user access
- Controlled access from IT network
Production Systems (OT)
- Fully separated from office network
- No direct internet exposure
User Devices (Laptops/Desktops)
- Restricted access to critical systems
- Limited permissions
Backup Systems
- Segmented and protected from ransomware
- Not directly accessible from user devices
Remote Access (VPN/RDP)
- Secured with MFA
- Limited to specific systems
Insight:
If everything can “talk to everything,” your network is not secure.
Common Segmentation Mistakes in Manufacturing
Most companies believe they are segmented but aren’t.
Common Mistakes
- Flat networks with no real separation
- ERP systems accessible from all user devices
- Production systems connected directly to the internet
- No monitoring between IT and OT networks
- Over-permissioned access across systems
Consequences
- Ransomware spreading across entire environment
- Production shutdowns
- Data loss and system corruption
- Increased recovery time and cost
Many ransomware incidents in manufacturing succeed because networks are not segmented properly.
Step-by-Step: How to Implement IT vs OT Segmentation
Most manufacturers can implement effective segmentation within 30–90 days.
Step 1: Map Your Current Network
- Identify all systems (IT and OT) and how they connect
Step 2: Define Network Zones
- Separate IT, OT, and secure access layers
Step 3: Implement Firewalls & Access Controls
- Control traffic between zones
Step 4: Restrict Access
- Limit who can access ERP and production systems
Step 5: Monitor & Maintain
- Continuously monitor traffic and update rules
Segmentation is not just design. It requires ongoing management.
Illustrative Scenario: Containing a Ransomware Threat Through Segmentation
A 70-employee manufacturing company in Los Angeles experienced a phishing attack that compromised a user’s workstation.
Because proper segmentation was in place:
- The infection was contained within the IT network
- ERP systems remained unaffected
- Production systems continued running
- Backup systems were not impacted
Result:
The company avoided a full shutdown and reduced what could have been a $50,000+ incident to a minor disruption.
Why Work With an IT Provider That Understands IT vs OT Segmentation
Manufacturing companies benefit from IT providers who understand:
- The difference between IT and OT environments
- How to design segmented networks
- Cybersecurity risks specific to manufacturing
- How to protect production systems from IT-based threats
A specialized provider ensures your network is designed to contain threats, not spread them.
Trust Signals
Fothion supports manufacturing companies that require:
- Secure and segmented network environments
- Protection for ERP and production systems
- Reduced ransomware risk and downtime
- IT strategies aligned with operational continuity
With over 20 years of experience, Fothion helps manufacturers build resilient and secure IT environments.
Protect Your Network with Proper Segmentation (30 Minutes)
If you’re unsure whether your network is properly segmented, the fastest next step is a structured review.
Book a 30-minute call with Fothion and we’ll:
- assess your current network structure
- identify segmentation gaps and risks
- outline practical steps to improve security
Book here: https://fothion.com/schedule-a-phone-call/
FAQs (with answers):
1.What is IT vs OT network segmentation?
IT vs OT segmentation separates business systems (IT) from production systems (OT) within a manufacturing network. This limits access and prevents cybersecurity threats from spreading between environments.
2.Why is network segmentation important in manufacturing?
Segmentation reduces the risk of ransomware spreading across systems. Without it, a compromised device can affect ERP systems, production networks, and critical infrastructure.
3.What systems should be segmented in a manufacturing network?
Key systems include ERP servers, production systems (PLCs, SCADA), user devices, backup systems, and remote access tools. Each should be isolated and controlled based on function and risk level.
4.How does segmentation protect against ransomware?
Segmentation limits how malware can move within a network. If one system is compromised, segmentation helps contain the threat instead of allowing it to spread across the entire environment.
5.How long does it take to implement network segmentation?
Most manufacturing companies can implement basic segmentation within 30–90 days, depending on network complexity and existing infrastructure.
6.Do cyber insurance providers require network segmentation?
While not always explicitly required, segmentation is often expected as part of a strong cybersecurity posture and can impact approval, premiums, and claim outcomes.