title: Does private IP of an AWS instance change while instance is running?
body: <p>I have 2 instances running and a web application in one of them (Say instance1) uses private IP of another instance (Say instance2) to call a service.</p>
  
  <p>I restarted instance2(IP changes after restart) and restarted the web application on instance1 after adjusting the configurations accordingly, and application was up and running successfully.
  But then suddenly it stopped responding after 2 hours and when I looked for the problem, I found that the private IP of the instance2 was again changed while it was running.</p>
  
  <p>Has it happened with anyone else? If yes what's the solution for this?</p>