We're excited to announce the public preview of virtual network service endpoints for Azure Database for MariaDB in all regions where the service is available.
You can use virtual network service endpoints to isolate connectivity to your logical server from only a subnet or a set of subnets within your virtual network. The traffic to Azure Database for MariaDB from your virtual network always stays within the Azure backbone network. Preference for this direct route is over any specific routes that take internet traffic through virtual appliances or on-premises.
There's no additional billing for virtual network access through service endpoints.
from Azure service updates https://ift.tt/2EgXySb