title: Amazon RDS Endpoint internal
body: <p>How can I make ec2 instance communicate with rds instance on aws by internal ip address or dns? 
  I only see public dns like <code>xxx.cehmrvc73g1g.eu-west-1.rds.amazonaws.com:3306</code>
  Will internal ipaddress will be faster than public dns? </p>
  
  <p>Thanks </p>