Yes it does support fibre. The ethernet cable must plugged between openreach modem lan 1 and Netgear gigabit ethernet connects to cable or fibre modem on the grey ethernet lan port (not yellow) but the Netgear doesn't have it own VDSL2 modem but will work with FTTC with openreach modem connected from Lan 1 to Grey Ethernet Lan port on the router.
P.S. my friend have NETGEAR DGND4000 and it work on FTTC with Openreach Modem connected with this router.
See screenshot below:
Edited by adslmax (Thu 27-Aug-15 01:57:00)