Comment 3 for bug 1403955

Hi Robie,

Let me answer your questions:

> Why is br0 being set up to bridge eth0? Is something doing this automatically or is this configuration necessary for something (if so, what?)?
This configuration (br0 on a single physical interface) is automatically generated by deploying openstack Juno (I don't know what particular component does it, atm) on Trusty. In our case it's not necessary/mandatory, but just the result of the installation. I don't know what consequences we might face by disabling/removing br0, though.

> Without using br0 and just using plain eth0, does the interface-mtu option work correctly?
Will do asap, but on a first guess I think it would work

>... If so, I'm not sure it really makes sense for the DHCP client to set the MTU on eth0 when receiving DHCP over br0. I suppose it depends on the use case though.
I agree. In this particular scenario, having just one physical interface sharing its mac address with the bridge, I think it makes sense to expect the interface's MTU being set (there's no other interface acting as a constraint). Other situations, with several interfaces, manual config might be mandatory.