See Understanding The Domain Name Structure The DNS system consists of many Domain Name servers that together provide the name to IP address mapping for registered devices (usually servers) on the Internet.With the recent GA release and rapidly growing usage of virtual machines within Windows Azure, many are trying to set up an independent/non-VPN network.
With Azure DNS, you can be confident that your DNS will always be available.
NOTE: These instructions are designed for the experienced individual; this is not a beginners page.
If you do not understand or not sure what IPv4 means service will work for you just fine. Before you make any changes on your DNS settings for the Smart Viper Public DNS, WRITE DOWN your current server addresses/settings on a piece of paper.
These are very important for backup purposes, in case you need to return back to your default settings.
The great part of Azure virtual machines is that it can be as flexible as a set of PCs or VMs hosted within your own datacenter.