Connect via coaxial cable to the Ethernet port.
Connect via coaxial cable to the Ethernet port.
It seems you received a second modem. You should replace the existing one completely.
Let me check the setup. Did you mean to ask about the image loading issue?
I think you are confusing something, did you get a router or a modem? If it was a modem did you accidentally get a dsl instead of a coax modem? A dsl modem will have a phone jack instead of a coax connection.
Ok yeah, that Netgear is router, not a modem. From the back of your cable modem in the first picture, plug the YELLOW cable into the YELLOW ethernet jack on the Netgear. There's further configuration that I'd do with the netgear to make it work as intended, but as I said that involves either: a) Turning DHCP off on the netgear, and plugging the yellow cable from the cable modem to one of the gigabit ports OR b) Switching the yellow cable's port on the cable modem to DMZ so the router hands everything to the router. Otherwise you get double-NAT which some games can't deal with It will work without doing either, but you may have trouble getting games to work over double-NAT.
The round cable is coaxial. Your Xfinity box functions as a gateway, which includes a modem and router. To connect to their services you’ll need a modem. You have two options: A) Switch the box to bridge mode so it acts as a modem, or B) Purchase a cable modem. Based on the picture you see, it shows a gateway with an eMTA built in, meaning it supports voice calls. Digital voice modems can be more complex if you own one personally. Xfinity has strict requirements for the eMTA devices they support, so check their list before buying. If unsure, ask them to provide the box in bridge mode.
The Xfinity box functions as your modem. The Netgear router serves as a router. Connect the Netgear router to the Xfinity modem following these steps: insert the Coax Cable into the Xfinity Modem, and attach the Ethernet Cable from the modem to the WAN port on the Netgear router.
Xfinity doesn't provide modems; they handle gateways instead. It's important to stay clear about this, or the user might face double NAT issues. As far as I remember, the user will need to contact them to switch it into Bridge mode, at least during my last check.