Google Cloud provides several private access options. Each option allows virtual machine (VM) instances that have internal IP addresses to reach certain APIs and services. Choose an option that supports the APIs and services that you need to access.
The following table summarizes each option. You can configure one or all of these options. They operate independently of each other.
|Private Service Connect|
|Google Cloud resources with or without external IP addresses, and on-premises systems.||Connect to a Private Service Connect endpoint in your VPC network, which forwards requests to Google APIs and services.||Supports most Google APIs and services.||Connect to Google APIs and services using an endpoint in your VPC network. Google Cloud and on-premises resources don't need an external IP addresses.|
|Private Google Access||Google Cloud resources without external IP addresses.||Connect to the standard external IP addresses or Private Google Access domains and VIPs for Google APIs and services through the Virtual Private Cloud (VPC) network's default internet gateway.||Supports most Google APIs and services.||Use this option to connect to Google APIs and services without giving your Google Cloud resources external IP addresses.|
|Private Google Access for on-premises hosts|
|On-premises hosts with or without external IP addresses.||Connect to Google APIs and services, from your on-premises network, through a Cloud VPN tunnel or Cloud Interconnect by using one of the Private Google Access-specific domains and VIPs.||The Google services that you can access depend on which Private Google Access-specific domain you use.||Use this option to connect to Google APIs and services through a VPC network. This method doesn't require your on-premises hosts to have external IP addresses.|
|Private services access|
|Google Cloud VM instances with or without external IP addresses.||Connect to a Google or third-party managed VPC network through a VPC Network Peering connection.||Supports some Google or third-party services||Use this option to connect to specific Google and third-party services without assigning external IP addresses to your Google Cloud and Google or third-party resources.|
|Serverless VPC Access|
|Google Cloud VM instances with or without external IP addresses.||Connect directly from serverless Google services through an internal VPC connection.||Cloud Run (fully managed), App Engine standard environment, and Cloud Functions||Use this option to connect from a serverless environment on Google Cloud directly to resources in a VPC network using internal IP addresses.|