title: Monitor how much public traffic usage with iftop on a aws vpc
body: <p>I'm trying to identify what is spending so much traffic on my AWS machine using iftop.</p>
  
  <p>The problem is, apparently, ec2 instances don't have a public interface, so iftop only monitors the private ip at <code>eth0</code>.</p>
  
  <p>I need to identify what hosts are connecting to my machine and how much traffic they are generating in an arbitrary time-frame. How can I do that at AWS without a public interface?</p>