Once I noticed that Comcast was IPv6 enabled in my area switching it on was as easy as checking a couple of boxes in my airport express. One was to enable IPv6

Once I noticed that Comcast was IPv6 enabled in my area switching it on was as easy as checking a couple of boxes in my airport express. One was to enable IPv6 and the other was to block incoming IPv6 connections. I have not noticed any issues since enabling it. Dual stack seems to work well. As browsers seem to choose whichever is faster I have seen some behaviour where Google thought I was accessing gmail from multiple locations at the same time when infact I had switched from IPv4 to IPv6.