Solved: Netgear Address Reservation - Invalid MAC Address [Workaround]
Introduction
DHCP Address Reservation is broken on several Netgear routers. Specifically Nighthawk R7900P with V1.4.4.94_1.3.56 firmware, but it doesn't work for other routers and firmware as well.
The problem is the front end JavaScript removes the colons from the MAC address, but the back end software requires the colons.