The fix should check if the phys interface MTU < lxc-default-mtu, then enforce the MTU on the phys interface or apply the 'post-up /sbin/ip link set eth0 mtu 9000', entry on the juju-br0 config.
The fix should check if the phys interface MTU < lxc-default-mtu, then enforce the MTU on the phys interface or apply the 'post-up /sbin/ip link set eth0 mtu 9000', entry on the juju-br0 config.