I learned the basics of IPv6 a few years ago, and forgot some of it... but NDP, the built in default addresses for router solicitation, address assignments and

I learned the basics of IPv6 a few years ago, and forgot some of it... but NDP, the built in default addresses for router solicitation, address assignments and so on. I'll tell you that if you just think of it on its own, it's really no harder than IPv4 + ARP + DHCP, just one or two extra things to remember. The difficulty of adoption is the featureset and the UX of operating systems and home routers in particular. It is really difficult to find a consumer router, or even home networking OS, that exposes sensible working defaults for IPv6. The problem extends to the ISPs. The spec is fine.