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how to connect 2 Ethernet cables directly to a single port modem ?

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how to connect 2 Ethernet cables directly to a single port modem ?

does xfinity support connecting 2 ethernet cables directly to a single port modem and how would I accomplish this....

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Re: how to connect 2 Ethernet cables directly to a single port modem ?

Is it a Comcast gateway with built-in WiFi? I know some of them have only a single Ethernet port. For those, you just need an Ethernet switch, similar to this:

https://www.amazon.com/Ethernet-Splitter-Optimization-Unmanaged-TL-SG105/dp/B00A128S24

 

If you have your own plain modem, then you will need to get a router since residential service only allows one IP address (generically meaning device) connected to the modem.