I get your problem a bit better. You need to allow the network service to start at boot. To do so, with Fedora, you need enable the network in the windows that appears when typing
There, you have all the services setup on your machine. From my point of view, you need to enable the network and dhcp.
Otherwise, you might have to look into
Go in the edit parameters of your LAN card, and make sure that the "button"
Activate device when computer starts
Try to reboot your machine, and stick around when it boots up. Look if the LAN eth device is enable in the process.