I installed Fedora 12 on a couple of boxes that are to become headless monitoring stations. When I reboot them, I still have to go in via the console to activate the network device (eth0). I have the box checked to activate on boot. I even went and looked in ifcfg-eth0 and ONBOOT is set to "yes". I've worked with earlier versions of Fedora and I also have Redhat 5 installations, and networking always comes up when the system are booted. Also, in various directories under /etc/sysconfig/networking, I found three additional copies of ifcfg-eth0 and they all agree, "ONBOOT=yes".