I've got a pc with two ethernet cards: a 3com etherlink 10mb ISA and a 3com etherlink 100mb PCI. The PCI cards is connected to the network and has a fixed IP address. The other card is connected to a PLC with a crosscable. This one has a fixed IP address and a subnetmask but no gateway. So here's the problem. I try to ping to that PLC but no luck. So i think he's trying with the wrong card. How do you know which card he chooses for a ping?
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