Write Firewall Rules as Decisions
Use firewall policy principles to distinguish a justified allow rule from an undocumented exposure.
Firewall policy is decision hygiene. A firewall controls traffic between networks or hosts with different security postures. The technical control only works as well as the policy behind it. If the policy is vague, the rule base becomes a memory of old emergencies rather than a current statement of acceptable communication. Strong firewall rules are narrow and explainable. They identify the exact source, destination, service, and reason. They also have an owner who can defend the business need and a review date that prevents 'temporary' from becoming permanent. Logging expectations matter too. If the rule protects a sensitive path, the…
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