Red Hat 6.1 on a custom built Pentium 166. Everything seems to work fine, except the Network adapter - which is an SMC 10BaseT PCI NIC (DEC 21040-AA chip). When the system boots it fails to start networking. But, if I run netconfig from the console (before I go into X) I can successfully get an IP address (through DHCP). I have tried a 3c509 card as well, but that doesn't seem to work at all.