Comment by billyjobob

My ISP added IPv6 support and my router began handing out IPv6 addresses. How did I know this?

1. My AppleTV began stuttering during playback.

2. My old iMac began crashing every time it connected to the wifi.

At least the iMac has an option to disable IPv6. The AppleTV has no such option so I had to do it in the router.