Internet disconnected when replacing w new Spectrum Modem model ET2251 to the system w Netgear C3000

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CD2022 wrote:

My current set up is cable (white) from wall to a cable splitter: 1 cable (white) to new Modem Spectrum ET2251 and other cable (white) to Router Netgear C3000.

 

 

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The C3000 is a cable modem/router. Google isn't conclusive, but it looks like the Spectrum ET2251 is a simple modem only device with support for voice devices.

It is hard to follow your description of where the cables run – a picture is worth a thousand words – but you can't run two modems off one cable input.

Unfortunately, cable modems do not have a router only mode. No WAN port on the back.

If you want to use the Spectrum modem, and need more than one LAN connection, you might find it easier to replace the C3000 with a router only box.

While many questions about routers are generic and could be answered anywhere, some things need specialist knowledge.

You might get more help, and find earlier questions and answers specific to your device, in the appropriate section for your hardware. That's probably here:

Cable Modems & Routers

You could also visit the support pages:

Support | NETGEAR

Feed in your model number and check the documentation for your hardware. Look at the label on the device for the model number.

Check for various troubleshooting tips.

You may have done this already. I can't tell from your message.

I mention it because Netgear stopped supplying printed manuals and CD versions some years ago and people sometimes miss the downloads.