M7: Single Stack IPv6 ONLY Nodes (no known implementations today)
- but nodes can be run ipv6-only, e.g. FreeBSD, Linux (the main missing piece
- is often IPv6 transport for client host DNS lookups). This is being done
- in some WLAN networks.
This is not what IPv6 ONLY refers to. A machine, such as a linux or BSD
box, that has only an IPv6 interface configured is not IPV6 ONLY, it is
still dual stack. Unless these implementations were modified to remove
the IPv4 stack, they are not IPV6 ONLY devices.