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Industrial Firewalls and NAT Gateways for OT Networks
Industrial Firewalls and NAT Gateways for OT Networks
Industrial firewalls control communications between machine networks, automation systems and production networks. Through filtering rules and network segmentation, they help restrict access and reduce the exposure of industrial devices.
At Garma Electrónica, we offer Helmholz WALL IE industrial NAT gateways and firewalls, designed to integrate machines into higher-level networks, manage IP addressing and control traffic between network segments.
What Do You Need to Protect or Connect?
- Separate industrial networks: control traffic between machine networks and production networks.
- Integrate machines with duplicate IP addresses: use NAT to avoid addressing conflicts.
- Restrict network access: configure filtering rules based on addresses, protocols and ports.
- Maintain a common subnet: use bridge mode with filtering when required by the network architecture.
Need help selecting an industrial firewall? Contact our technical team.
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More info about Industrial Firewalls and NAT Gateways for OT Networks
How to Choose an Industrial Firewall for Automation Networks
An industrial firewall allows communication rules to be established between devices and segments of an OT network. It is particularly useful when connecting machines to plant networks, integrating existing installations or restricting which devices are allowed to exchange information.
Helmholz WALL IE devices combine NAT gateway and traffic filtering functions. Selecting the appropriate model and operating mode depends on the IP architecture, required ports and communication requirements.
Key Functions of Industrial NAT Gateways and Firewalls
Network Segmentation and Traffic Filtering
Firewall rules restrict connections between networks using criteria such as IPv4 addresses, TCP/UDP protocols, ports and MAC addresses. Effective segmentation depends on the configuration of the filtering rules and the network architecture.
NAT for Machines with Duplicate IP Addresses
Network Address Translation (NAT) simplifies the integration of machines using identical IP address ranges into a production network. Depending on the configuration, functions such as Basic NAT, SNAT, NAPT and port forwarding can be used.
Bridge Mode Within the Same Subnet
In Bridge mode, the device can apply traffic filtering between network areas without necessarily requiring different IP subnets. This can be useful when introducing traffic control while maintaining the existing IP addressing structure.
Configuration and Maintenance
The WALL IE family provides a web-based configuration interface and manufacturer-documented administration functions. Authorised communication flows should be defined in advance, and the final configuration should be documented.
WALL IE Standard vs WALL IE Compact
Both products available in this category support NAT and firewall functions, but they differ in Ethernet connectivity and communication speed.
| Feature | WALL IE Standard | WALL IE Compact |
|---|---|---|
| Part number | 700-860-WAL01 | 700-863-WAL01 |
| Ethernet ports | 4 RJ45: 1 WAN and 3 LAN | 2 RJ45: 1 WAN and 1 LAN |
| Speed | 10/100 Mbps | 100/1000 Mbps |
| Operating modes | NAT and Bridge | NAT and Bridge |
WALL IE Standard can be suitable when several LAN connections are needed and Fast Ethernet is sufficient. WALL IE Compact provides a two-port alternative with Gigabit connectivity for integrating a machine network with another network.
Applications and Benefits
- Machine builders: integration of machines using repeated IP address configurations.
- Production networks: segmentation and control of communications between network areas.
- Industrial modernisation: integration of existing machinery without necessarily redesigning its entire IP addressing scheme.
- OT cybersecurity: implementation of access rules between network zones as part of a wider security strategy.
What to Check Before Installing an Industrial Firewall
Before selecting a device, identify the IP subnets, devices that need to communicate, industrial protocols, incoming and outgoing connections, and maintenance requirements. The firewall configuration should reflect these requirements.
A NAT gateway or firewall is not, by itself, a complete OT cybersecurity strategy. Effective protection also depends on network architecture, access policies, device maintenance and other technical and organisational measures.
Technical Advice on Industrial Network Segmentation
At Garma Electrónica, we help you select the appropriate WALL IE solution for machine integration and communication control between OT networks.
Tell us your network topology, IP addressing scheme, communication protocols and which connections need to be allowed or restricted.