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When i try to use the 3com 3c905c card in my Linux 6.1 (Kernel 2.2.12-20) and conect these machine on a Cisco Catalist Switch, the network was work for a few minutes and down. If these machine is conect on a hub, the network will be work very well. The problem is relationed with the Switch. My Switch is working very well with my network and all computers. I was get the driver from the 3com site, and i choose the apropriate version for my Linux and i compile as recomendade. I was try many times and none ... and i put my old card realtech-8029 to work again. Please, if anyone have the solution for this problem, report here ! Thank you Very much ! Carlos Cherem carlos@cherem.net
Most probably your catalyst switch has been statically configured to 100? full-duplex, and your network card is in autonegotiate state. In that case, the switch has to be reconfigured or the card forced to a different mode (in /etc/conf.modules). Some Cisco switches have been reported to be unreliable with autonegotiation.