[libvirt-users] Help with Vrbr0

[Gao feng]

On 11/22/2013 03:47 PM, Sherin A wrote:
> 
> Hello,
> 
>  I am not able to see  vrbr0  in my  box. Can  some one help me with this ? . I am trying KVM+libvirt   and planing to use Routed mode. I hope this virbr0 must be up for using this .  I can give an
> strace too.
> 
> OS : Debian , kernel 3.12.0
> libvrit version :  0.9.8
> ____________________________________________________________________
> root@:~# ifconfig
> br0       Link encap:Ethernet  HWaddr 4c:72:b9:32:32:86
>           inet addr:10.0.0.12  Bcast:10.0.0.255  Mask:255.255.255.0
>           inet6 addr: fe80::4e72:b9ff:fe32:3286/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:4523 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:4068 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:2286336 (2.2 MB)  TX bytes:411238 (411.2 KB)
> 
> eth0      Link encap:Ethernet  HWaddr 4c:72:b9:32:32:86
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:17044 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:14253 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:12594945 (12.5 MB)  TX bytes:1902456 (1.9 MB)
>           Interrupt:20 Memory:f7c00000-f7c20000
> 
> 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:4 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:240 (240.0 B)  TX bytes:240 (240.0 B)
> 
> -------------------------------------------------------------------
> root@:~# virsh net-start default
> error: Failed to start network default
> error: failed to add iptables rule to enable masquerading
> 
> root@:~# virsh net-list --all
> Name                 State      Autostart
> -----------------------------------------
> default              inactive   yes
> 
> root@:~#  virsh net-start default
> error: Failed to start network default
> error: failed to add iptables rule to enable masquerading
> 

seems like your kernel doesn't have ipt_MASQUERADE installed.
try modprobe ipt_MASQUERADE