Same error i faced i edited default.xml using the below command

virsh net-edit default

<network>

<name>default</name>

<uuid>Your Uuid number</uuid>

<forward mode='nat'>

<nat>

<port start='1024' end='65535'/>

</nat>

</forward>

<bridge name='virbr0' stp='on' delay='0'/>

<mac address='Your MAc'/>

<ip address='192.168.122.1' netmask='255.255.255.0'>

<dhcp>

<range start='192.168.122.2' end='192.168.122.254'/>

</dhcp>

</ip>

</network>


Then added virtual bridge

brctl addbr virbr0 

Then restart the libvirt..




On Thu, Nov 20, 2014 at 12:02 AM, David Roundy <roundyd@physics.oregonstate.edu> wrote:
Yes, /etc/libvirt/qemu/networks/default.xml exists and has the contents:

$ cat /etc/libvirt/qemu/networks/default.xml 
<network>
  <name>default</name>
  <bridge name="virbr0" />
  <forward/>
  <ip address="192.168.122.1" netmask="255.255.255.0">
    <dhcp>
      <range start="192.168.122.2" end="192.168.122.254" />
    </dhcp>
  </ip>
</network>


On Thu, Oct 23, 2014 at 10:16 AM, Michal Privoznik <mprivozn@redhat.com> wrote:
On 22.10.2014 00:03, David Roundy wrote:
Hi Michal,

I am attaching debug logs.

David

 Well, I can see the error message there, but not the reason. Does the /etc/libvirt/qemu/networks/default.xml file exist?

Michal



--
David Roundy

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Regards,
Ajitha R