On 08.03.2013 08:40, yue wrote:

libvirt has a default NAT network, it create a bridge based on virbr0-nic, how virbr0-nic is created?

thanks

It's created in networkStartNetworkVirtual and subsequent functions which all boils down to: fd = open("/dev/net/tun", O_RDWR)); in virNetDevTapCreate. Michal