You can actually move anywhere with Mobile IPv6. If you move outside your AS, it automatically tunnels your traffic back to your home network with IPsec. There'

You can actually move anywhere with Mobile IPv6. If you move outside your AS, it automatically tunnels your traffic back to your home network with IPsec. There's also a feature called "Correspondent Node" which allows you to send traffic directly rather than tunnelling via your home network. Which kind of makes it sound like IPv6 already has the feature the article thinks it should have had.