[firelake92]

do they make 2-port Ethernet connectors to plug 2 cables into 1 port?

kinda of like the phone jack one but for ethernet cables

phone jack connector

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Is there any reason you wouldn't want to use a switch for this instead of a splitter? I think that you will have some issues if you try to use a splitter.

[Gravity Gripp]

Is there any reason you wouldn't want to use a switch for this instead of a splitter? I think that you will have some issues if you try to use a splitter.

[fawoodward]

Yes, don't split the wires, use 2 network cards if it's for the same computer, or a switch or hub.

[Mobious]

There are devices that would server the purpose of splitters but they are much known as network taps. These are devices acts as passive hubs. So this means that if you are going to use it on your computer, your computer and the both devices on the other end of the splitter will be on the same collision domain or basically will behave like all of them are in one hub.