P.S. If i'm understanding you properly you can access from home if you use windows, just not with Knoppix. If that is the case, then you could learn all you need from that one location by watching your packets on both Windows and then on Knoppix. It would be the "best" test too, since you would be going through the same router, modem, ISP equipment and so on.

You can't watch the Windows box with Knoppix and ethereal unless you have a hub to share the signal (a switch will not normally let you see traffic for other systems). But yoy can get a copy of ethereal that runs under windows and watch the connection that way.