title: Request.ServerVariables["LOCAL_ADDR"] returns "::1"
body: <p>I need to get the server's IP address so that this can be sent along with a Key/Value string collection to a Payment Gateway provider.</p>
  
  <p>I'm running localhost, and <code>Request.ServerVariables["LOCAL_ADDR"]</code> is returning <code>::1</code></p>
  
  <p>The validation error I'm getting is returned from Sage Pay:</p>
  
  <blockquote>
    <p>The ClientIPAddress format is invalid. Should not include leading
    zero''s, and only include values in the range of 0 to 255.</p>
  </blockquote>
  
  <p>Why is this, and how do I get a valid IP address to send?</p>