title: AWS ELB and VPC Router interaction
body: <p>I have a pretty simple question that drives me nuts. I am trying to understand how VPC router (routing tables) and ELB interact with another. 
  I read documentation and tried understanding it, but without success. My current understanding of a VPC is pretty much like this:</p>
  
  <ul>
  <li>Data passes the I-GW</li>
  <li>The I-GW uses the VPC router and its routing tables to forward the request/traffic to the ELB.</li>
  <li>The ELB is used to address e.g. EC2 instances</li>
  </ul>
  
  <p>What I think I got from the internet:</p>
  
  <ul>
  <li>Data passes the I-GW</li>
  <li>The ELB is using listeners to determine incoming traffic (e.g. Port 80)</li>
  <li>ELB is forwarding the traffic to the instances.</li>
  </ul>
  
  <p>Updated by adding diagram (sry, I did not earn the privileges to upload one directly). :(</p>
  
  <p><a href="https://i.stack.imgur.com/Zs3JL.png" rel="nofollow noreferrer">enter image description here</a></p>