Network Interface Controllers (NIC) that are embedded on the motherboard are identified by udev as em1, em2, etc. This is part of an attempt to make interface naming more predictable and meaningful.
That's what you will find instead of eth0, eth1, etc.
To get back the old name go to: /etc/default/.
There you'll find the configuration file for the default Fedora boot loader, GRUB: grub
Add the following command (bold) to the line with the key GRUB_CMDLINE_LINUX:
GRUB_CMDLINE_LINUX="rd.md=0 rd.lvm=0 rd.dm=0 SYSFONT=True KEYTABLE=us rd.luks=0 LANG=en_US.UTF-8 biosdevname=0 rhgb quiet"
Go to /boot/grub2, make a backup copy of grub.cfg and regenerate the GRUB configuration file:
> grub2-mkconfig -o grub.cfg
Reboot and eth0 will be back!
Hints here and there.
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