I have an old modem I was considering repurposing. The first step I thought to do was connect my computer with the modem and try to map the open ports. I found that, upon connecting the device, that my eth0 interface was assigned an IP address. My computer also has a wireless NIC (wlan0), so I now have two IP addresses.

I scanned eth0 and got the results. Then, for good measure, I port mapped my wireless interface only to find that the results were identical. As such, the obvious conclusion is that by scanning eth0 I was in fact scanning myself.

So, how can I go about scanning the modem? My knowledge in this space is limited, but in order to do this I imagine the modem itself requires the assignment of an IP. Or am I thinking about this incorrectly?

EDIT: The modem is an older Motorola 3360 used ages ago with a DSL connection.

  • What kind of modem do you have? (it does not mean much; my latest optical-fiber internet connection also has a modem and gives me 200 Mbits/sec).... Why and what for do you want to use it? How is your modem connected (physically & logically)? To what? With what protocols (PPP....)? Please edit your question to improve it; it is currently nearly meaningless. – Basile Starynkevitch Jun 27 '15 at 16:24
  • @BasileStarynkevitch, Repurpose in terms of throwing away its "modem" functionality and using any available I/O pins and processing power for something completely different. – sherrellbc Jun 27 '15 at 16:31
  • Please edit your question, instead of commenting it. Give more details about your modem (e.g. hardware reference, how it is connected, etc.) And explain why you consider doing that. – Basile Starynkevitch Jun 27 '15 at 16:32
  • @BasileStarynkevitch, All I know of the modem is the model information. A search around Google gives only user manuals with no technical references that I could find. – sherrellbc Jun 27 '15 at 16:39
  • But why do you want to reuse it (especially since it has apparently bad reputation)? Does it have several ethernet ports? Can't you just buy a cheap Ethernet bridge or hub? – Basile Starynkevitch Jun 27 '15 at 16:42

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