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implementing-gcp-vpc-firewall-rules

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Implements and audits GCP VPC firewall rules using gcloud, covering auditing overly permissive rules, creating restrictive ingress/egress rules, hierarchical firewall policies, and monitoring rule effectiveness with VPC Flow Logs. Use when deploying GCP workloads needing network access controls, auditing firewall configs, or responding to Security Command Center findings; not for Cloud Armor or DNS-based filtering.

When to use

• When deploying new GCP workloads that require network-level access controls
• When auditing existing firewall configurations for overly permissive rules
• When implementing zero trust network segmentation within GCP VPC networks
• When responding to Security Command Center findings about open firewall rules
• When building hierarchical firewall policies across a GCP organization

When not to use

• Cloud Armor
• DNS-based filtering
• application-layer filtering
• VPN/interconnect traffic filtering

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