The service projects do not have any network, and therefore they rely on the shared VPC configured in the host project to get IP addresses.

1. Create host and service projects if they do not exist yet.
2. Create a shared VPC network inside the host project.
3. Create subnets inside the shared VPC network, assuming that we have created a Custom mode VPC network.
4. Create an appropriate firewall rule in the shared VPC network.
5. Configure the shared VPC, defining the host project along with its subnets, and select the service projects.