Setup C3000 N300 as “repeater” for XFINITY gateway

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CompleteNovice wrote:
I’ve seen some methods for changing advanced settings to allow a netgear to act as wireless access point.

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That would be for routers and DSL modem/routers. Cable modem/routers like the C3000 do not have this built into their controls.

An access point needs a wired connection to the main router. Cable modem/routers don't have that "WAN socket".

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Is this another way to say signal repeater (ie connect to “repeater” but it’s using main router’s signal), if so are there any plain English instructions to accomplish it?

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If you mean that you want to use a device as a wifi repeater, also known as a wireless bridge, which is not the same thing as an access point, then that is even less likely to work on a modem/router.

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

In the meantime you could 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.

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.

C series modems only support router gatway mode or modem only mode. No repeater or wireless bridge modes are supported.