ubuntu 12.04 - kvm network interface empty

[nzimas]

I have follwee this howto in order to set up a couple of KVM's.
For the most part everything went smoothly, except the virtual network interface, whch has neither an IP (public) nor a GW (public as well), although both have been assigned while building the VM.

Here's what ifconfog says:

br0 Link encap:Ethernet HWaddr 00:25:90:71:32:46
inet addr:1.2.3.4 Bcast:1.2.3.5 Mask:255.255.255.0
inet6 addr: fe80::225:90ff:fe71:3246/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:21416 errors:0 dropped:0 overruns:0 frame:0
TX packets:18501 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:117467022 (117.4 MB) TX bytes:1632901 (1.6 MB)

eth0 Link encap:Ethernet HWaddr 00:25:90:71:32:46
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:98249 errors:0 dropped:0 overruns:0 frame:0
TX packets:18873 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:123752134 (123.7 MB) TX bytes:1745755 (1.7 MB)
Interrupt:16 Memory:fbce0000-fbd00000

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:16436 Metric:1
RX packets:673 errors:0 dropped:0 overruns:0 frame:0
TX packets:673 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:82024 (82.0 KB) TX bytes:82024 (82.0 KB)

virbr0 Link encap:Ethernet HWaddr 7a:da:7d:91:c1:cc
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)

vnet0 Link encap:Ethernet HWaddr fe:54:00:7a:8f:b6
inet6 addr: fe80::fc54:ff:fe7a:8fb6/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:1 carrier:0
collisions:0 txqueuelen:500
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

and route -n says

Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 1.2.3.4 0.0.0.0 UG 100 0 0 br0
1.2.3.0 0.0.0.0 255.255.255.0 U 0 0 0 br0
192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0

The VM is running:

virsh # list
Id Name State
----------------------------------
1 whatever running

but iface-list returns an error

virsh # iface-list
error: Failed to list active interfaces
error: this function is not supported by the connection driver: virConnectNumOfInterfaces

Help is much welcome.


[EDIT]

Just in case, /etc/network/interfaces looks as follows (the public IP's are changed for obvious reasons)

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet manual


auto br0
iface br0 inet static
address 1.2.3.4
network 1.2.3.0
netmask 255.255.255.0
broadcast 1.2.3.255
gateway 1.2.3.254
bridge_ports eth0
bridge_fd 9
bridge_hello 2
bridge_maxage 12
bridge_stp off

[falko]

According to http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=597158, you can try this to fix the problem:

apt-get install libvirt-bin

[nzimas]

Thanks for the heads up.
The issue I am currently faced with has to do with networking (final posts down the thread).
I simply can't find a straight howto addressing a scenario where there's only one physical NIC which is used to handle the public IP.