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Public IP addresses:
By default, public IP addresses are dynamic and the address associated to them may change when the VM is stopped or deleted. To ensure that the VM always uses the same public IP address, create a static public IP address. One public IP address can be assigned to an instance at instance creation. Additional public IP addresses can be created using by creating a new resource
(Home > Create a Resource > search for Public IP address and select resource > Create) and assigning the resource to an instance interface.