To enforce private connectivity between on-premises hosts and Google Cloud APIs while optimizing for cost and operational efficiency, using a dedicated or Partner Interconnect is the best solution. This setup ensures a reliable, high-bandwidth connection with private IP addressing. Choose Interconnect Type: Decide between Dedicated Interconnect and Partner Interconnect based on your bandwidth needs and proximity to Google Cloud locations. Set Up Interconnect: For Dedicated Interconnect, order circuits through the Google Cloud Console. For Partner Interconnect, select a supported service provider and order the connection through them. Configure VPC and Private Google Access: In your VPC, enable Private Google Access to allow on-premises hosts to access Google APIs privately. Go to "VPC network" -> "Private Google Access" and enable it for your subnets. Establish Connectivity: Work with your network team and (if applicable) your Partner Interconnect provider to set up the physical and logical connections. Test Connectivity: Verify that on-premises hosts can reach Google Cloud services using private IP addresses.
Reference:: Google Cloud Interconnect Overview Configuring Private Google Access