Comment 1 for bug 1403955

Presumably this is related to the DHCP client via dhclient and dhclient-script, so presumably should be a task on isc-dhcp?

I see code in dhclient-script that sets the MTU based on the DHCP option, but it doesn't have any special behaviour for br0. So I'm wondering if this code is being used at all, or if some other interaction is causing it to fail in this case.

Why is br0 being set up to bridge eth0? Is something doing this automatically or is this configuration necessary for something (if so, what?)?

Without using br0 and just using plain eth0, does the interface-mtu option work correctly?