Re: Mapping plan
"The people who devised IPv6 were NOT engineers - any sensible engineer knows the KISS principle and would not produce such an overblown structure as IPv6."
Could not agree more. A simple extension of the address space to create a 128-bit IPv4 would have by now been in use worldwide for at least a decade. See Dan Bernstein's quite old article "The IPv6 Mess" https://cr.yp.to/djbdns/ipv6mess.html. Nothing much has changed.