I don't run FC31 but on all my other Fedora systems, I add net.ifnames=0 to the kernel
command line /etc/default/grub:
GRUB_CMDLINE_LINUX="rd.md.uuid=41012be5:1df005d4:cfee0bd3:e112219a net.ifnames=0 rd.shell rd.timeout=65 consoleblank=600 rcu_nocbs=0-15"

Then regenerate the grub menu:
# legacy BIOS
grub2-mkconfig -o /boot/grub2/grub.cfg
I don' have but one EFI server:
grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg


On 11/27/2019 10:42 AM, sean darcy wrote:
On 11/27/19 8:09 AM, Roberto Ragusa wrote:
On 2019-11-26 19:58, Sean Darcy wrote:

On boot:
kernel: asix 2-3:1.0 eth0: register 'asix' at usb-0000:00:14.0-3, ASIX
AX88772 USB 2.0 Ethernet, 00:0e:c6:dc:01:aa
kernel: usbcore: registered new interface driver asix
kernel: asix 2-3:1.0 enp0s20u3: renamed from eth0

then I unplug and plug:
kernel: asix 2-3:1.0 internal: renamed from enp0s20u3
kernel: asix 2-3:1.0 internal: link up, 100Mbps, full-duplex, lpa 0x45E1

That does not happen if I plug and unplug external, an ethernet cable.

BUT, what's really odd. I'm booting the Fc31 kernel:


if I boot the same kernel, but FC30:



Any help appreciated.
I've seen the same issue some time ago (but on Centos 7).
The basic problem is that interface renaming must happen correctly
in the initramfs, where you have to be sure the network configuration is fine;
that explains why a successive unplug/replug works.
In my case there was no NetworkManager involved, just the old "service network start"
things, with configs in /etc/sysconfig/network-scripts/ifcfg*
No idea what can have happened between those two kernels, apart
from indeed having different intiramfs content.
You should try extracting the two initramfs and doing a comparison.
Something like:

[root@router boot]# cat z_decompress.sh

set -e

/usr/lib/dracut/skipcpio $initramfs >z_decomp_$initramfs.cpio.gz
rm -Rf z_dir_$initramfs
mkdir z_dir_$initramfs
cd z_dir_$initramfs
gunzip <../z_decomp_$initramfs.cpio.gz | cpio -i

Best regards.

Thanks, but that's beyond my kernel skill set.

Here's what I tried, all without success:

1.  put 2 .link files is /etc/systemd/network

ls /etc/systemd/network
10-external.link  10-internal.link
cat /etc/systemd/network/*



2. put 70-persistent-net.rule in /etc/udev/rules.d

cat /etc/udev/rules.d/70-persistent-net.rules
SUBSYSTEM=="net", ACTION=="add", ATTR{address}=="50:7b:9d:0b:8a:ab", NAME="external"
SUBSYSTEM=="net", ACTION=="add", ATTR{address}=="00:0e:c6:dc:01:aa", NAME="internal"


One odd result of running udevadm test on the "external"  interface:

enp1s0: Failed to rename network interface 2 from 'enp1s0' to 'external': Device or resource busy

There must be some trick here that I'm missing. What's the problem with the FC31 kernel ?


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