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Last updated: April 29, 2026
VPC Service Controls = GCP’s data-exfiltration defence. Define a perimeter; data can’t leave it even with valid credentials.
VPC Service Controls = GCP’s data-exfiltration defence. Define a perimeter; data can’t leave it even with valid credentials.
The model
- Perimeter wraps GCP services + projects
- Inside perimeter: free communication
- Outside attempting to access services inside: blocked unless explicit ingress rule
- Inside attempting to send to outside: blocked unless explicit egress rule
Common patterns
- Lock prod data in perimeter; only allow ingress from corporate VPN
- Allow GCS reads only from specific service accounts
- Block BigQuery exports to external projects
Operational reality
VPC SC breaks lots of things. Use dry-run mode for 4-8 weeks to identify violations before enforcing. Indian banks adopt VPC SC for sectoral compliance.
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