MPS Order No.176 Implementation for Manufacturing: Hard Isolation Between Office and Production Networks to Block Ransomware Lateral Propagation

Office networks in manufacturing plants support email, OA, ERP and other business systems, while production networks connect PLCs, industrial control equipment, machine vision units and production management platforms. If an office PC is infected with ransomware and there is no robust security boundary separating the office and production networks, attacks can spread along reachable links, corrupt production data, halt operations and disrupt manufacturing workflows.

MPS Order No.176, Measures for Cyberspace Security Supervisory Inspection by Public Security Organs, took effect on October 1, 2026. Its inspection scope covers cybersecurity management systems, safeguards against cyberattacks and intrusions, and rectification of security risks. For manufacturers, cybersecurity cannot rely solely on endpoint antivirus software. Protection must be built into network architecture, access permissions and boundary defence to contain threats originating from the office zone.

I. Security Risks of Interconnected Office and Production Networks

1. Compromised office endpoints become attack entry points
   Employees may get infected after opening phishing emails, downloading malicious files or visiting compromised websites. If office PCs can directly access production servers, engineering workstations or industrial devices, attackers can probe for vulnerabilities, steal credentials and move laterally across the network.
2. Incomplete segmentation fails to contain breach scope
   Some factories create separate office and production VLANs yet still allow interconnection via routing, shared servers or remote maintenance tunnels. Without strict access controls, logical segmentation cannot reliably block cross-domain traffic. Once one node is compromised, threats continue spreading through permitted communication paths.
3. Single-layer protection leaves security gaps
   Firewalls, endpoint antivirus and network isolation serve different purposes. Relying on only one defence mechanism creates blind spots. Endpoint protection cannot replace boundary access control, and network segmentation alone cannot mitigate all web application vulnerabilities or malicious file threats. Manufacturers need a multi-layer security framework tailored to production operations.

II. How AINOPOL Builds a Security Framework for Office and Production Zones

1. All-optical network zoning to define clear boundaries
   AINOPOL all-optical networking plans the plant network for office IT, production control, video surveillance and device management. Proper zoning, VLAN configuration and access policies prevent default communication between office terminals and production equipment.

For high-security production control zones, independent physical links or dedicated isolation appliances can be deployed based on risk assessment. Note that VLAN segmentation is not equivalent to physical hard isolation; the final design must match on-site topology, business dependencies and security requirements.

1. Coordinated IPS, WAF and antivirus on Dream Gateway to fill defence gaps
   The AINOPOL Dream Gateway integrates IPS, WAF and antivirus engines to deliver multi-layer boundary protection for factory networks.

• IPS (Intrusion Prevention System): With over 10,000 signature rules, it identifies and blocks exploit attempts and scanning traffic to reduce vulnerability-based attacks.
• WAF (Web Application Firewall): Shields OA, ERP portals and other web services against OWASP Top 10 risks, lowering the chance of web vulnerability exploitation.
• AV (Antivirus): Powered by a signature library of more than 4 million malware samples, it detects and blocks known malicious files at the network perimeter.

These modules complement one another: IPS targets network intrusion traffic, WAF secures web applications, and antivirus filters malicious payloads. Multi-layer defence reduces attack success rates, yet it cannot replace mandatory isolation between IT and OT networks, nor guarantee interception of new zero-day ransomware variants.

1. Communication-Security Integrated architecture unifies network and security planning
   For large sprawling factories with widely distributed production equipment, AINOPOL’s Communication-Security Integrated solution is built on an all-optical foundation with converged audio-video and embedded security capabilities. It unifies fibre transmission, remote power supply and security management, cutting redundant cabling and long-term maintenance overhead.

This integrated design optimises infrastructure deployment, but security boundaries between office and production domains still require dedicated isolation architecture, firewall rules, permission controls and audit logging. Synchronised planning of network construction and security policies balances production uptime and threat protection.

III. Build a Closed-Loop Defence from Architecture to Daily O&M

Manufacturers should periodically audit all interconnections between office and production networks, review cross-domain access rules, remote maintenance accounts and device vulnerabilities, and remove unnecessary communication tunnels. Supplementary measures include endpoint hardening, patch management, critical data backup and security drill exercises.
Any modification to industrial control networking must undergo dependency assessment and full pre-deployment testing to avoid disrupting production.

Compliance with MPS Order No.176 is not merely splitting the network into two subnets. The core objective is to enforce controlled access between IT and OT domains, deploy active attack defences and enable rapid incident response.
Leveraging all-optical infrastructure together with the Dream Gateway firewall, IPS, WAF and antivirus capabilities, AINOPOL helps manufacturers mature their cybersecurity posture and limit ransomware lateral movement that threatens production.

FAQ

Q: Will the production network remain safe if an office computer gets ransomware?
A: Under a properly deployed setup, office and production domains run on independent PON ports. Traffic from the office layer cannot physically reach the production domain. Even if an office endpoint is fully compromised, scanning activity is confined within its original PON segment. Paired with micro-segmentation, lateral spread inside the office zone is also restricted to the minimal scope.

Q: Can remote inspections under MPS Order No.176 detect weak IT/OT isolation in factories?
A: Yes. Public security authorities use vulnerability scanning and penetration testing to verify reachability from office subnets to production subnets, exposed ports and weak passwords on dumb terminals. Mere nominal VLAN separation without effective access controls will be flagged clearly. Remote inspections are notified three working days in advance, leaving very limited time for rushed emergency configuration changes.