This terraform plan can be used to deploy a Google Classic VPN with IPSec IKEv1.
Simply by running:
$ terraform plan
$ terraform apply
You will need to specify the region, the gcp_project, the host_peer_ip and the prefix for the resources.
If you want to get the peer_ip of your machine automatically use the following:
terraform plan -var "host_peer_ip=$(curl -s 'https://api.ipify.org?format=json' | jq -r '.ip')"
To destroy the deployment you can do a terraform destroy