Read the original article: Isolate Your CloudHub Worker Instances Using VPN
MuleSoft CloudHub is a multi-tenant integration platform as a service. Applications hosted on CloudHub workers or instances are balanced by a shared load balancer provided by MuleSoft.
At any given point in time, your MuleSoft API deployed on CloudHub might want to interact with on-premise resources and, for that, we need to have a secured connection tunnel that is not exposed on the public cloud.
Read the original article: Isolate Your CloudHub Worker Instances Using VPN