title: Can an Amazon EC2 Instance access another Instance by Private IP?
body: <p>I have two separate instances in my test scenario</p>
  
  <ol>
  <li>Web Server Instance</li>
  <li>Database Server Instance</li>
  </ol>
  
  <p>So far the only way I can get from <code>1st</code> to <code>2nd</code> Instance is by having Elastic IP's configured and using the Public DNS (or IP) reference. I can limit unwanted access by configuring the Security Group for <code>2nd</code> to only take <code>Port 1433</code> traffic only from <code>1st</code>.</p>
  
  <p>It seems like Instances within the same Amazon AWS zone should be able to talk to each other more efficiently than first going out and then coming back in.</p>
  
  <p>Is there a way to go directly from <code>1st</code> to <code>2nd</code> instance using just the Private DNS (or IP)?</p>