Thank you for the answer. I will try and post it back here.

2017-05-17 16:49 GMT-04:00 stan <stanl-fedorauser@vfemail.net>:
On Wed, 17 May 2017 14:58:23 -0300
Lucélio Gomes de Freitas <aa.lucelio@gmail.com> wrote:

> How to restart the network and NetworkManager services?

Pick one, both can't run.  The default service on Fedora is now
NetworkManager.  Restart it like this (as root):
systemctl restart NetworkManager
To disable network service:
systemctl stop network
systemctl mask network

If your system isn't finding the ethernet card on boot, that could also
cause the problem.  Check in journalctl -b by searching for eth.  Are
there errors there?

The suggestion to make sure it is turned on in the BIOS is a good one.
It should show up in the output of lspci.

Is it possible that this is new ethernet hardware that your old F20
kernel doesn't have a driver for?  Do you have an old ethernet card
laying around that you could plug into a slot, and get networking back?
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