alt Hacker NewsWhut?
IPv4 is an example of _correct_ layering. The hardware address is a detail that does not leak into upper layers. It's confined purely to the network layer.
In contrast, with IPv6 the whole 64/64 separation is a result of leaking the MAC address into upper protocols. Indeed, MAC was supposed to be a part of the publicly visible IPv6 addresses for hosts!
Huh? No, the MAC was never a part of the publicly-visible v6 address.
I know you're talking about SLAAC, but SLAAC is just a convenient way of picking a unique address. Changing the address wouldn't result in e.g. the packet being sent to a different MAC. Even sending packets to link-local addresses still does NDP, rather than parse the MAC out of the address.