title: Static IP for Cloud Service on Azure
body: <p>I have a <code>Cloud Service</code> that has Worker Role. Cloud Service is set to scale at 5 instances. There is an operation that requires communication from Azure to our data center. For the communication to happen, we have to Whitelist the IP address.</p>
  
  <p>My question is that since I have set the <code>Cloud Service</code> to have 5 instances, do I need 5 static IPs or 1?</p>
  
  <p>Also how does this pan out if I set it to <code>Auto Scale?</code></p>