It is a fact that the bridge takes the lowest MAC address from the attached 
ports for the host port. See for example 
http://backreference.org/2010/07/28/linux-bridge-mac-addresses-and-dynamic-ports/

Thus if a container is restarted, the host port can potentially change its MAC 
address and containers will have a stale ARP cache. This of course causes 
problem for communication container->host.

Tested the workaround mentioned in the link but then I got problem with network 
manager on a later Ubuntu version. Then I tried using a dummy container and 
reusing its MAC addr for the host port. Works but...

Now my question, could not lxc (at boot) setup a fixed MAC addr for the host 
port?

Thanks,
Hans

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