The driver for the 3C905 NIC which ships on the R4.5 CD does not seem to support full-duplex mode. Trouble is, if your card is already in full-duplex mode, BeOS won’t simply run it in half-duplex. Instead, BeOS will give you a „Duplicate IP Detected“ error message. To fix this, boot into Windows and run the configuration utility that came with the card to knock it back into half-duplex mode. It will now run properly under BeOS. Hopefully BeOS will soon support full duplex mode for this card natively.