Firewall Rules Calculator
Analyze firewall rule sets to calculate deny ratio, risk score, and optimization suggestions. Improve your firewall policy quality.
How to Use the Firewall Rules Calculator
- Enter total number of rules.
- Enter number of deny rules.
- Enter number of allow rules.
- Enter number of any-any rules.
- Click Calculate to see risk analysis.
Cas d'utilisation
- •Auditing firewall configurations for security compliance.
- •Identifying overly permissive rules in production firewalls.
- •Preparing for security assessments or penetration tests.
- •Cleaning up legacy firewall rule sets.
Formule
Deny ratio = deny rules / total rules × 100%. Risk score = any-any rules impact + insufficient deny rules penalty.
Questions fréquemment posées
What is an any-any firewall rule?
An any-any rule allows all traffic from any source to any destination — the most dangerous firewall configuration.
What deny ratio is good?
A well-configured firewall should have a deny ratio of 50–80%, with explicit allow rules for needed services.
How should I order firewall rules?
Place most-specific rules first, then general rules. Deny rules for known threats should come before allow rules.