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CISCO DPC3941T Connected to my internet this morning

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CISCO DPC3941T Connected to my internet this morning

I had a device called CISCO DPC3941T connect to my internet around 4:30am today, and everyone in our house was asleep. My modem is a Gateway modem so I know it’s not ours. How do I remove it?
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Re: CISCO DPC3941T Connected to my internet this morning

The DPC3941 IS a gateway device. Apologies if you already know this, but as used by Comcast, "gateway" refers to a combination modem/wifi router/eMTA (home phone service) device, not a brand name. They are sometimes called "modems", but "gateway" is more correct.

 

What is the model number of your gateway "modem"?