Setup Multiple Public IPs on a VM in Azure
https://azure.microsoft.com/en-au/updates/ga-multiple-ips-per-nic/
https://heranonazure.wordpress.com/2017/07/26/create-a-vm-with-multiple-ips/
https://azure.microsoft.com/en-au/updates/ga-multiple-ips-per-nic/
https://heranonazure.wordpress.com/2017/07/26/create-a-vm-with-multiple-ips/
researchadmin said
Don't forget you also have to manually set the gateway and ip address for the network connection within the operating system after you do all the setup in the Azure Portal.