What is the Purdue Model in network segmentation?

The Purdue Model (PERA) is a hierarchical framework that segments industrial networks into levels (0 to 5) to isolate physical processes from enterprise IT networks, enhancing security through defense-in-depth.

Can I use this for purely IT environments?

No, this skill is specifically designed for Operational Technology (OT) and SCADA environments where physical processes must be separated from business networks.

What kind of firewall rules does the skill generate?

It generates rules that enforce boundaries, such as blocking direct IT-to-PLC access, mandating Jump Servers in the DMZ, and allowing industrial protocols like Modbus or OPC UA only between authorized levels.

How does this skill support IEC 62443 compliance?

It provides the structural framework for defining security zones and conduits, ensuring that communication between different levels of the industrial network is strictly controlled and monitored.

Purdue Model Network Segmentation

Name: Purdue Model Network Segmentation
Author: micsapp

bymicsapp

0•

Security & Testing

Automates the design and implementation of hierarchical network segmentation for industrial control systems based on the Purdue Model.

This skill helps cybersecurity professionals and network engineers secure Industrial Control Systems (ICS) and Operational Technology (OT) environments by applying the Purdue Enterprise Reference Architecture (PERA). It provides structured guidance for classifying assets into levels 0 through 5, designing secure VLAN schemes, and generating strict firewall rules to prevent unauthorized lateral movement between IT and OT domains. By automating the planning of zones and conduits, it ensures alignment with IEC 62443 standards and helps remediate security risks in converged industrial environments.

Key Features

01Generation of protocol-specific firewall rules for industrial traffic

02Automated mapping of OT/IT assets to Purdue Model levels 0-5

03Compliance alignment with IEC 62443 zone and conduit requirements

040 GitHub stars

05Architecture design for Level 3.5 IT/OT DMZ environments

06Standardized VLAN range assignment for hierarchical industrial zones

Use Cases

01Retrofitting flat industrial networks into secure segmented architectures

02Remediating audit findings regarding direct connectivity between enterprise and control networks

03Designing secure IT/OT DMZs for historian replication and remote access

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add micsapp/micstec-skills implementing-purdue-model-network-segmentation

For use in Claude.ai and ChatGPT

Key Features

01Generation of protocol-specific firewall rules for industrial traffic

02Automated mapping of OT/IT assets to Purdue Model levels 0-5

03Compliance alignment with IEC 62443 zone and conduit requirements

040 GitHub stars

05Architecture design for Level 3.5 IT/OT DMZ environments

06Standardized VLAN range assignment for hierarchical industrial zones

Use Cases

01Retrofitting flat industrial networks into secure segmented architectures

02Remediating audit findings regarding direct connectivity between enterprise and control networks

03Designing secure IT/OT DMZs for historian replication and remote access

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add micsapp/micstec-skills implementing-purdue-model-network-segmentation

For use in Claude.ai and ChatGPT