title: How to access cloud sql using internal IP address (RFC 1918 space) from a compute engine?
body: <p>My understanding is Google Cloud SQL (MySQL/ Postgres) instance uses Compute Engine behind the scene. Two compute engine in the same single VPC can communicate via internal IP address. On the similar line if a compute engine provisioned in Zone1 and if Cloud SQL instance is provisioned in the same Zone1 then doesn't this mean Compute Engine and Cloud SQL are in the same VPC (because no new VPC is created when a Cloud SQL is provisioned) and why external compute engine cannot access cloud sql via internal IP? What I see from the documentation is Cloud SQL is always accessed via external IP address. Is there any egress cost when using static IP address?</p>
  
  <p>Thanks
  Mahesh</p>