Vultr.com now offers Private Networking for all users! Using Private Networking, your account's VMs can communicate with each other via unmetered private networking as long as they are located in the same region.
You can enable Private Networking in two ways:
1. For new instances, on the deploy page you can select the Enable Private Networking checkbox
2. For existing instances, on the IPv4 tab you will have an Enable Private Networking button. This will require that you manually add the configuration for the private interface.
Stay tuned for more great features @Vultr !