small update
On my test vm with 2 network interface, I have tested
# ifup ens19
ifup: unknow interface ens19
:confused:
with "dmesg | grep ens19", I see "virtio_net virtio3 ens19: renamed from eth1",
and that’s it, no mistake ...
Edit: OK, I have forgot. "ifup and ifdown are used to set up...