...
The "Register this connection's addresses in DNS" option has been deselected, because this causes DNS registration requests to go out, which we do not want. Eventually things look like this:
NTP
At the time of writing, the default time server that is used by Windows 2008 R2 to sync its clock, time.windows.com, unfortunately is not (yet) reachable over IPv6.
But again, SURFnet comes to the rescue, because several of their NTP servers are IPv6-enabled. I picked chime3.surfnet.nl, which, according to the web interface, appears to be a Meinberg NTP server. Windows seems to dig it: