I just installed Slackware Linux 1337 and the network card does not show up even though it was configured on setup. I looked around restarted the network and nothing worked. After trying to figure it out I googled around for slackware 8139too wont start and some other phrases. I found someone saying it was the blacklist file.
Sure enough I look in /etc/modprobe.d/blacklist.conf and there is
I comment it out
Then I reboot and it works.