I'm networking 3 pcs together for training purposes, How would I go about this without having to pay for a business line from comcast? I'm don't own a website, this is strictly for windows, linux...

I have hyper v installed with 2 vitual machines os'es running and I'm trying to set up a client/server so i can pratice ad, group policy and so forth.

However I can't even ping the server from the...