when I create a interface, There is no mac attribute in the xml. After create successfully, libvirt will allocate a mac. The problem is that, How can I get the mac. Should the CREATE method always needs to return an interface info? Here is some of create code. def vmifaces_create(self, vm, params): dom = self._get_vm(vm) xml = """ <interface type='network'> <source network='default'/> </interface> """ dom.attachDeviceFlags(xml, libvirt.VIR_DOMAIN_AFFECT_CURRENT) # here I need to return the mac return ???? The libvirt will create a xml like the follow? The problem is that the a vm may have several interfaces. xml = """ <interface type='network'> <mac address='52:54:00:2a:53:8f'/> <source network='default'/> <model type='rtl8139'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> """ -- Thanks and best regards! Sheldon Feng(冯少合)<shaohef@linux.vnet.ibm.com> IBM Linux Technology Center