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#11
Yes, with the Ethernet network in place to allow you access to the internet, everything needed is already in place to share files on your local network.
My suggestion would be to take a look at the tutorial I sent the link for earlier.
Think of it like this:
You have roads that you drive on that you use to take you to far away places. However, you can also use that same road system to go next door, or just around the corner.
The same holds true with your Ethernet connections. You currently use them to get to places on the Internet. But that that same cabling will allow your machines to talk to each other locally.
I'm sure that if you have never done this before, it can be a little daunting, but give the tutorial a shot. If you have any difficulties, please do feel free to ask and we'll be happy to walk you through everything step-by-step if needed.
Personally, I can't live without my network connection between machines. There are times when I often transfer several terrabytes of data between machines and there is no way that is going to happen with any thumb drives!