Comment 22 for bug 1447715

Martin, I'm not sure.
I just realized that the original report shows a dhclient line of

/sbin/dhclient -d -q -6 -N -sf /usr/lib/NetworkManager/nm-dhcp-helper -pf /run/sendsigs.omit.d/network-manager.dhclient6-eth0.pid -lf /var/lib/NetworkManager/dhclient6-c0a3dfde-5c0b-4cef-9c3b-563cfb1fb9d2-eth0.lease -cf /var/lib/NetworkManager/dhclient6-eth0.conf eth0

the '-sf' is scriptfile, which defaults to dhclient-script, which is where the patch in bug 1633479 was made. The fix proposed here was to ifupdown, but it would seem to me that since network manager provides its own script-file, that NetworkManager is still not fixed, unless it somehow uses /sbin/dhclient-script (it might)