networkd cares about an interface, but is still in progress..
- the DHCP lease data (such as NTP/DNS) is still made available when
a carrier is lost on a link. It should be removed instantly.
- - maybe have bool flag in .link units to enable promiscuous mode for interfaces
- http://lists.freedesktop.org/archives/systemd-devel/2014-July/021568.html
- .network setting that allows overriding of the hostname to send to the dhcp server
http://lists.freedesktop.org/archives/systemd-devel/2014-July/021550.html
- add per-network Domains= settings, with a special syntax Domains=*