Be sure to check that you are using decent quality CAT 5 cables.
What brand/type of switch are you using?
Why are you running it at auto off?
Just wondering. I am running a ZyXel Prestige switch/router at auto settings, and instantly got 100BT/full duplex (according to ASP w/ OS9). I'm not sure if there is an easy way to configure the NIC.
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-Keith
-Whatever you do, do the research.