Do you the know model name or someother info about the card? From what I searched, sk98lin seems to be the module for your ethernet cards, so try these steps as root -
# modprobe sk98lin
# netconfig
The second command will set up your IP address, host name and DNS settings for you. You can also manually do that with ifconfig, if you wish. If you want to auto load this driver every time, add the line "modprobe sk98lin" to /etc/rc.d/rc.modules.