I mentioned this issue on IRC but also posting here:
It's been on this list twice in the last week or so, details in this
bug, fixed in 4.18.16
https://bugzilla.redhat.com/show_bug.cgi?id=1628209
> I've been using Fedora on Cubox-i for a long time, I noticed that 4.18.x kernels
broke networking. Booting to 4.17.19-200.fc28 fixes the issue for me.
> The eth0 interface is still visible on 4.18.x kernels but it does not work:
> - The interface was connected to an Amplifi HD, the link kept going up/down every few
seconds (no such issue on older kernels)
> - Connecting the interface to a Cisco switch fixes the unstable link issue, the rest
of the tests were done with this switch
> - DHCP hangs (tested manually with dhclient, no output)
> - Setting an static IP on the interface works but no traffic passes through (tested
ICMP, etc.)
> I can provide more technical details and kernel log messages if required.
>
> Thanks,
> Siavash
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