title: How do I enable anonymous authentication for a specific IP subnet in IIS7 while maintaining basic authentication for every other IP subnet?
body: <p>I've stumbled across an issue with IIS7; apparently it is not possible to limit "anonymous authentication" to a certain range of IP addresses, i.e. a subnet, at least not in the GUI for a certain folder within a website:</p>
  
  <ul>
  <li>10.0.0.0/24: anonymous access to "/lan_ok_outside_basiconly"</li>
  <li>Every other IP: Basic Auth to "/lan_ok_outside_basiconly"</li>
  </ul>
  
  <p>The application within the folder does not need user credentials, it just needs to verify that the access is to be granted either by verifying that the client is in a specific internal LAN or by basic auth credentials from everyone else.</p>
  
  <p>Is there any way to achieve this in IIS7.5?</p>
  
  <p>Thanks.</p>