title: Tracking and logging anonymous users
body: <p>If you let anonymous users vote for any post on a site just one time and you log that vote by the user's IP, what's the likelihood that you'd be banning other users from voting and that the original user would be able to vote again after a certain amount of time because their IP address has changed? I'm guessing almost certainly.</p>
  
  <p>Client side cookies can be deleted and server side cookies again have no way to reliably map said cookie to the anonymous user.</p>
  
  <p>Does this mean there is no reliable way of tracking anonymous users indefinitely?</p>