You posted in the meural forum.
With questions about cadant. Which was a cable modem termination systems that was purchased by arris in 2001.
Arris who makes modem/routers/etc.
What actual netgear device do you have?
what else is on your network? Maybe its your modem/combo device?
Cadant isn't affiliated with netgear but one of your device might have a nic or other networking hardwire from them/arris.