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Virgin Media Warns UK Broadband Users Not to Switch Routers Off at Night - ISPreview UK
(www.ispreview.co.uk)
This is a most excellent place for technology news and articles.
you don't need to know how the ISP network works, you only need some networking concepts. Subnets/addressing and very basic routing (for a basic setup). You won't even need firewall rules if you don't host anything at your place (that needs to be accessed from outside)
Sorry. I'm addicted to knowledge. I need to know.
Chad