AiVibeIndustrial Firewall
An industrial firewall is a firewall built for OT networks that filters traffic between control system zones and can inspect industrial protocols in depth, for example allowing reads from a controller while blocking writes or program downloads.
An industrial firewall is a firewall designed for OT environments, built to protect control networks and enforce communication rules between zones. Besides standard filtering by address, port and protocol, many industrial firewalls perform deep packet inspection of industrial protocols such as Modbus TCP, EtherNet/IP, S7comm, DNP3 and OPC, so rules can permit read requests while blocking writes, program downloads or firmware updates. Hardware variants are often ruggedised for DIN-rail mounting in control cabinets.
Industrial firewalls are used on IEC 62443 conduits, between Purdue levels, at the boundary of the industrial DMZ and directly in front of critical controllers or legacy devices that cannot protect themselves. Some can run in a transparent mode, inserted into an existing network without readdressing devices, which simplifies retrofits in running plants.
Rules must be built from documented data flows and tested carefully, since blocking a required message can stop production. A learning or monitoring mode is often used to observe traffic before enforcement. Firewalls in OT should behave in a predictable, documented way when they fail, be managed centrally under change control and send logs to security monitoring. Their security capabilities can be assessed against the IEC 62443-4-2 requirements for network devices.
Key points
- Filters traffic between zones and in front of critical or legacy controllers
- Deep packet inspection can distinguish read, write and program commands
- Ruggedised DIN-rail versions suit control cabinets
- Rules must be built from documented flows and tested before enforcement
Where AiVibe comes in
In AiVibe's AiAmbA AI Factory, the AiAmbA IoT edge layer keeps writes to machines deny-by-default and AI agents only propose changes that a trained operator confirms. AiVibe's security services include vulnerability assessment and penetration testing, and AiVibe is ISO/IEC 27001:2022 certified.
Related terms
- OT Network SegmentationOT & Industrial Cybersecurity
- Zones and ConduitsOT & Industrial Cybersecurity
- Industrial DMZ (IDMZ)OT & Industrial Cybersecurity
- Industrial Protocol SecurityOT & Industrial Cybersecurity
- Deny-by-Default ControlOT & Industrial Cybersecurity
- ModbusPLC & Industrial Control