Curt Stauffer said:
I tried (via insmod bcm4400 <options>) to set for 10M half-duplex; it appeared to work but I was then unable to communicate with my gateway (icmp host unreachable when trying to ping the gateway or another machine on my internal network). I tried another approach to see what would happen and unhooked all but the Fedora machine from the gateway and using the default settings for the card (100M, full-duplex, no flow control). The number of errors reduced dramatically (but not to zero). Funny thing is that the Win2K machine I unhooked wasn't doing anything as far as I could tell, so why would unhooking it make any difference?
Maybe you unhooked a faulty cable? One that works "sort of", but maybe isn't quite up-to-spec? Something like that...