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Ethernet has a self-assigned IP Address & will not be able to connect to the Internet
NETGEAR Nighthawk Multi-Gig Speed Cable Modem DOCSIS 3.1 for XFINITY by Comcast Two (2) Gigabit Ethernet port with auto-sensing technology. How do I set up this modenm so I can have one ethernet...
The CM modem does not have a built in router. The two ports in back are for WAN side IP addresses given to the modem by an ISP. Some ISP do not give out more than 1 IP address to a given modem, even ones with more then 1 WAN port on the back. You can ask your ISP if there is an option to get another WAN IP address on the other port on the modem. If they don't support that, then your limited by just the 1 port and 1 IP address from the ISP.