It’s very easy to deploy IPv6 for MPLSVPN service provider who uses IPv4 as transport IPv6 traffic. But in the case of mobile users or normal enterprise users, it is totally different.
In my previous post, I have mentioned traffic flow of DNS64 when IPv6 host communicates with IPv4 server. NAT64(Network Address Translation) works in either stateless or stateful mode. Both modes has its own advantages and disadvantages.