I finally have Internet at home (geekery)
My cable modem arrived today ($60 from Amazon) and I hooked it up. It was able to train up but couldn't get any routing, so I called Comcast, and the tech (who treated me respectfully and didn't talk down to me etc.) found that when I placed the order, the sales person entered it as a self-install with a leased modem, which is certainly not what I ordered, nor what the sales person had confirmed to me. But he got it straightened out, and after I gave him my MAC address, I was online right away. Awesome.
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