This will explain how to add multiple IP addresses to the WAN interface of a NSV on Microsoft's Azure platform.
You will first need to configure a second public address on the X1 interface within Azure by accessing your NSv Virtual machine settings.
Select Network. Then, click on your X1 interface.
Select IP Configurations.
Next, add another public IP or select an already existing one.
Then, you will assign this to a server behind the NSv. This is accomplished with a NAT policy. Navigate to Manage | Rules | NAT Policies.
Add new policy. The original source is any. The translated source will be Original. The Original Destination will be the private IP used in the previous AZURE configuration. The Translated Destination is the private IP of your server behind the X0 interface. The Original service is the service you are forwarding to this host. The translated service should be Original. The inbound interface will be X1 and the outbound interface will be any. Click OK when you are done.
Next, create an inbound access rule under Manage | Rules | Access Rules.
Click Add. The service will be your service you are trying to forward. The source will be any. The destination will be the private IP address used before.
You should now be able to access the server using this public IP address.