Five-flow GCP ingress firewall architecture securing Ansible automation, Nessus vulnerability scanning, Zabbix monitoring, PAM privileged access, and public-facing SAP endpoints across Malwee's multi-project infrastructure. Traffic flows from source IPs (Ansible 10.121.0.24, Nessus 10.111.0.63, Zabbix monitors, PAM hosts, and internet partners) through GCP firewall rules tagged by service (allow-ansible, allow-ingress-scans-nessus, allow-ingress-peering-monitor, fw-malwee-pam-1-2, allow-sap-pub) to target projects including malwee-sap, malwee-prd-motor-de-regras, malwee-backup-dr, and gcp-malwee-monitor. The diagram highlights critical security gaps: Nessus lacks target tags (scanning all VMs), PAM rules expose ephemeral port ranges, and SAP public rules contain redundant entries requiring consolidation. Use this diagram to audit firewall rule scope, eliminate overly permissive rules, and document intended access boundaries before production deployment. Consider forking on Diagrams.so to customize for your own multi-project GCP security posture and create runbooks for rule remediation.