To connect Compute Engine instances within a Google Cloud Platform project to workloads running

in a dedicated server room that can only be accessed from within the private company network, you

can use the following approaches:

Cloud VPN: Cloud VPN securely connects your on-premises network to your Google Cloud Virtual

Private Cloud (VPC) network through an IPsec VPN connection. This enables secure communication

between your GCP instances and your on-premises workloads over the internet.

Cloud Interconnect: Cloud Interconnect provides direct physical connections between your on-

premises network and Google's network. It offers higher bandwidth and lower latency compared to

Cloud VPN, making it suitable for workloads that require fast and reliable connectivity.

Both Cloud VPN and Cloud Interconnect allow you to securely connect your on-premises

environments to Google Cloud, ensuring that the workloads remain within the private company

network.

Reference:

Cloud VPN Overview

Cloud Interconnect Overview