Re: Mapping plan
IPv6 isn't a magic bullet, but it is designed to fix these routing issues
At the cost of making implementation for the end user much, much more complex. Even my small home network is hard to configure for IPv6 (router, firwall, VM host - they can all see each other but can't route IPv6 packets successfully..)
IPv6 was designed by theorists who designed 'the perfect addressing model'. Once that was presented to people who actually do networking, the kludges needed to make it actually work started appearing. Like DHCPv6..