title: Change Primary Elastic Network Interface(ENI) between two EC2 Instances
body: <p>Can we change Primary Elastic Network Interface from Ec2 Instance to another Ec2? </p>
  
  <p>I'm able to swap the secondary ENI's between the Ec2 Instances, but not able to change the primary ENI from one Ec2 instance to the other.</p>
  
  <p>Is it possible to change the primary ENI?</p>