Install RTL8029 in DOS under Lantastic

Does anyone have any information on how to install a Realtek RTL8029 PCI NIC in an ASUS P2B-B mb running DOS and Lantastic? I’ve tried everything I can think of and the NIC is not even being recognized as being installed. Using an ISA slot is not an option. Both are already being used. Any assistance with this problem would be very much appreciated.