CentOS에서 virbr0는 guest OS가 NAT으로 사용함
일반적으로 사용하지 않으니 disable 처리 하면 됨
virbr0 - disable
virsh # net-list
virsh # net-destroy default
# /etc/init.d/libvirtd restart 또는 service libvirtd stop
virbr0 - enable
virsh # net-list –all
virsh # net-define /usr/share/libvirt/networks/default.xml
virsh # net-autostart default
virsh # net-start default
virsh # start ubuntu
error: Failed to start domain ubuntu
error: Network not found: no network with matching name ‘default’
path : /etc/libvirt/qemu/ubuntu.xml
변경 전
<interface type=’network‘>
<mac address=’54:52:00:5e:53:d2′/>
<source network=’default‘/>
</interface>
변경 후
<interface type=’bridge‘>
<mac address=’54:52:00:5e:53:d2′/>
<source bridge=’br0′/>
</interface>
출처: http://sugerent.tistory.com/366 [MISTERY]