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- Add scripts/agent.py and references/api-reference.md to all remaining skills - Update all 648 LICENSE files: copyright now reads 'Mahipal' - Add implementing-security-monitoring-with-datadog (new skill with full anatomy) - All 649 skills now have: SKILL.md, LICENSE, scripts/agent.py, references/api-reference.md
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API Reference: Implementing Network Segmentation for OT
Purdue Reference Model
| Level | Name | Assets |
|---|---|---|
| 0 | Process | Sensors, actuators, field devices |
| 1 | Basic Control | PLCs, RTUs, safety systems |
| 2 | Supervisory | HMIs, engineering workstations |
| 3 | Operations | Historians, MES, OPC servers |
| 3.5 | DMZ | Data diodes, patch servers |
| 4 | Enterprise | ERP, email, business apps |
| 5 | External | Internet, cloud, vendors |
Zone Audit Checks
| Check | Severity | Description |
|---|---|---|
| No firewall | CRITICAL | Zone boundary unprotected |
| Control zone internet access | CRITICAL | Level 0/1 reaches internet |
| No IDS monitoring | HIGH | No intrusion detection |
| No DPI | HIGH | No OT protocol filtering |
| IT-OT bypass DMZ | CRITICAL | Direct Level 4 to Level 1 |
Common OT Protocols
| Protocol | Port | Purdue Level |
|---|---|---|
| Modbus/TCP | 502 | 0-1 |
| EtherNet/IP | 44818 | 0-2 |
| DNP3 | 20000 | 0-1 |
| OPC UA | 4840 | 1-3 |
| S7comm | 102 | 0-1 |