> My friend零 home broadband from Comcast (cable modem) is the starting point
I've been using an old Linksys router for years and years and numerous
Macs have connected to it wirelessly with no problems, including the two
Macs I use currently, one of which I'm using as I type this.
My current provider happens to be Comcast, by the way.
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Good judgment results from experience, and experience results from bad judgment.