Virtual interfaces on host are bouncing up and down

LXD
5

Okay, I created a custom rules file (/etc/udev/rules.d/85-nm-unmanaged.rules):

# Virtual Ethernet device pair. Often used to communicate with a peer interface
# in another net namespace and managed by libvirt, Docker or the like.
ENV{INTERFACE}=="veth*", ENV{NM_UNMANAGED}="1"

The interfaces are now no longer managed:

$ nmcli -o d
DEVICE        TYPE      STATE                   CONNECTION                  
enp0s31f6     ethernet  connected               Kabelgebundene Verbindung 1 
lxdbr0        bridge    connected (externally)  lxdbr0                      
wlp4s0        wifi      disconnected            --                          
dummy0        dummy     unmanaged               --                          
erspan0       erspan    unmanaged               --                          
veth576670f3  ethernet  unmanaged               --                          
veth68d924cb  ethernet  unmanaged               --                          
veth9671cbf0  ethernet  unmanaged               --                          
gre0          iptunnel  unmanaged               --                          
gretap0       iptunnel  unmanaged               --                          
sit0          iptunnel  unmanaged               --                          
tunl0         iptunnel  unmanaged               --                          
lo            loopback  unmanaged               --

and the interfaces are no longer bouncing up and down, either.

Thank you Tom!

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