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I have a laptop that has wifi and cable. The ethernet interface is called enp0s21f5 and I need to have it under a bridge to be able to connect tap/tun from kvm virtual machines. The networking is configured via /etc/network/interfaces:

auto br0 iface br0 inet dhcp bridge_ports enp0s21f5 bridge_stp off

(I have bridge_stp off to avoid the learning phase of the bridge where dhcp would hold for 30 seconds)..

The problem I try to solve is the case where the network cable is not connected and I boot up. I already decreased the timeout in the systemd scripts. However I want to make it use allow-hotplug instead. allow-hotplug br0 doesnt seem to work because the event is on enp0s21f5.

Question: Is there some howto that describe howto setup the networking definition to handle this kind of setup? I understand that I would need to trigger a script on plugin/plugoff of ethernet cable that would configure my bridge setup. Maybe with allow-hotplug enp0s21f5 and manual configuration? Maybe

auto br0
iface br0 inet manual
  bridge_ports enp0s21f5
  bridge_stp off   

allow-hotplug enp0s21f5
iface enp0s21f5 inet manual
  post-up brscript.sh
  post-down brscript.sh

or similar? Because this is a standard scenario I wonder weather there is such a brscript.sh script already? Or is there some other way to do it?

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