Inbound NAT rules are an optional setting in the Azure load balancer. These rules essentially create another port mapping from frontend to backend, forwarding traffic over a specific port on the frontend to a specific port in the backend. The difference between inbound NAT rules and port mapping in load balancer rules is that inbound NAT rules apply to direct forwarding to a VM, whereas load balancer rules forward traffic to a backend pool.
Creating inbound Network Address Translation (NAT) rules
Getting ready
Before you start, open the browser and go to the Azure portal via https://portal.azure.com.