What is a good Firewall Policy?

March 2, 2023

OT (Operational Technology) firewall policies can vary depending on the specific needs and requirements of each organization, but there are some general guidelines that can help create a good OT firewall policy:

  1. Define your security objectives: Determine what security objectives you want to achieve with your firewall policy. This could include protecting critical infrastructure assets, preventing unauthorized access, and monitoring for anomalous behavior.
  2. Understand your network architecture: Before creating a firewall policy, you need to have a clear understanding of your network architecture, including the devices and systems that need to be protected, and the traffic flows that are permitted.
  3. Identify potential threats and vulnerabilities: Identify potential threats and vulnerabilities to your OT network, including known vulnerabilities in your OT devices, malware, and insider threats.Access Rules
  4. Use a risk-based approach: Use a risk-based approach to determine which traffic to allow and which traffic to block. Consider the likelihood and potential impact of each threat, and prioritize security controls accordingly.
  5. Use segmentation: Segment your OT network into smaller zones to contain potential threats and limit the impact of a security incident.
  6. Follow the principle of least privilege: Limit access to your OT network to only those users and devices that require it to perform their duties.
  7. Monitor and update your policy: Regularly monitor and update your firewall policy to ensure it remains effective and up-to-date with the latest threats and vulnerabilities.

By following these guidelines, you can create a good OT firewall policy that helps protect your critical infrastructure assets and prevent cyber attacks.

– Reach out to one of our OT/ICS Specialists if you would like to hear more –

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