This was a huge problem with the IETF early on but real network operators persisted and got fully functional vrrp, dhcp, and private networks for v6 years ago.

This was a huge problem with the IETF early on but real network operators persisted and got fully functional vrrp, dhcp, and private networks for v6 years ago. As for disabling autoconfiguration, high end network hardware has always supported disabling router advertisements. Consumer devices should have this option, there is no reason not to. A generic workaround in any case is to configure the local subnet with a prefix length other than /64.