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I have a network of about 50 PC's connected through an HP Proliant switch, with Cisco routers. There are 4 workstations that exhibit some very strange behavior. When you power any one of the computers down, it brings the network to a grinding halt. There's approximately a 90% packet drop rate. This lasts until you either disconnect the computer from the network via yanking the cable or powering the computer back up. Any ideas?

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Are these Dell machines? – DanBig Sep 23 '10 at 15:07
What kind of machines are thees? Or better, what exact NIC chipset are they using? – Chris S Sep 23 '10 at 15:24
They are Dell machines. It's in a detached office, so I'm having the onsite tech gather the info for me. – Jacob K Sep 23 '10 at 15:51
How hard would it be to stuff a brand new NIC adapter in the machine and disable the existing one? – Chopper3 Sep 23 '10 at 15:53
Try turning off Wake on Lan in the BIOS, if possible. – DanBig Sep 23 '10 at 15:59

I would look at/replace the network cables and cards from these machines. It's possible that when the power is off they're shorting the pins in an incorrect manner, causing a loop or noise on the ethernet.

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