Cable modems can also be hacked, enabling a user to consume some serious bandwidth. So if you are encountering extremely slow response times, report the problem to your ISP. They may need to place a sniffer on the segment.

As for seeing other PC's on the network. I agree with IKnowNot. Another possibility though is that your ISP placed theirclient Authentication server within a DMZ and disabled NetBios calls on the box.

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The mentally disturbed are persecuted here in America, and I say rightfully so!
These people are NUTS!