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A Linux software bridge will assume the MAC address of the enslaved interface with the numerically lowest MAC addr. When the bridge changes MAC address there is a period of network blackout, so a change should be avoided. The kernel gives TAP devices a completely random MAC address. Occassionally the random TAP device MAC is lower than that of the physical interface (eth0, eth1etc) that is enslaved, causing the bridge to change its MAC. This change sets an explicit MAC address for all TAP devices created using the configured MAC from the XML, but with the high byte set to 0xFE. This should ensure TAP device MACs are higher than any physical interface MAC. * src/qemu/qemu_conf.c, src/uml/uml_conf.c: Pass in a MAC addr for the TAP device with high byte set to 0xFE * src/util/bridge.c, src/util/bridge.h: Set a MAC when creating the TAP device to override random MAC
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>