Firewall Rule Calculator
Estimate firewall rule count from network zones, services, and segmentation level. Includes complexity assessment and audit time estimation.
Inputs
Results
Total firewall rules
82
Complexity (0-3)
0
Inter/intra-zone rules50
NAT rules6
Management rules18
Security audit time (hrs)6.8
Review interval (days)90
Estimated Latency Us16.4
How to Use This Calculator
- Enter the number of network zones (DMZ, LAN, WAN, server zone, etc.).
- Set services per zone and select segmentation level (flat, segmented, or microsegmented).
- Enter the number of public-facing services that require inbound access rules.
- Review total firewall rules, inter-zone rules, NAT rules, and management rules.
- Audit existing rulesets quarterly -- unused rules accumulate and increase attack surface.
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