If your system is running the Solaris 2.5.1 operating environment, versions: Hardware: 4/97, Hardware: 8/97, or Hardware: 11/97, you must add the pci_pci "pci1011,25" line to your /etc/driver_aliases file before installing the adapter. Refer to page 5 of the Sun Quad FastEthernet PCI Installation and User's Guide for instructions on editing the driver_aliases file.