Lately my Windows machine starts complaining IP conflict when I use my iPhone or iPad as mobile hotspot, but after I disabled the IPv6 in the particular connection, the problem goes away.  Thanks Doug.

To disable IPv6

  • Go to Control Panel -> Network and Sharing Center
  • Click on “Change adapter settings” on the left
  • Look for the connection that is relevant to the iPhone connection, double click on it
  • Click Properties
  • Uncheck the item “Internet Protocol Version 6 (TCP/IPv6)
  • OK all the way out, and enjoy the IP conflict free environment again.