Private networking support is provided at no cost. Traffic over private networks is free and doesn’t count against your bandwidth billing transfer allowance.
Private networking is available in every region.
Private networking isolates communication at the account or team level between Droplets located in the same datacenter.
DigitalOcean Load Balancers will connect to backend Droplets over the private network if it is enabled on the Droplets when they are added to the load balancer.