# nova-manage network create --label network01 --dns1 192.168.0.1 --fixed_range_v4=192.168.0.0/24
Command failed, please check log for more info
2014-04-08 10:36:50.119 6023 CRITICAL nova [req-26847201-9a78-4572-8691-4fced424372a None None] bridge_interface is required to create a network.

# ifconfig

br0       Link encap:Ethernet  HWaddr d4:3d:7e:91:23:7b
          inet addr:10.163.209.15  Bcast:10.163.209.255  Mask:255.255.255.0
          inet6 addr: fe80::d63d:7eff:fe91:237b/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:205442 errors:0 dropped:0 overruns:0 frame:0
          TX packets:101108 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:243974614 (243.9 MB)  TX bytes:7728080 (7.7 MB)

eth0      Link encap:Ethernet  HWaddr d4:3d:7e:91:23:7b
          inet6 addr: fe80::d63d:7eff:fe91:237b/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:205753 errors:0 dropped:258 overruns:0 frame:0
          TX packets:101175 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:246911056 (246.9 MB)  TX bytes:8164957 (8.1 MB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:155606 errors:0 dropped:0 overruns:0 frame:0
          TX packets:155606 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:265699711 (265.6 MB)  TX bytes:265699711 (265.6 MB)

virbr0    Link encap:Ethernet  HWaddr be:f8:54:6a:0c:9f
          inet addr:192.168.122.1  Bcast:192.168.122.255  Mask:255.255.255.0
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

wlan0     Link encap:Ethernet  HWaddr 20:68:9d:fb:61:42
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)