testnetdef.xml

<network>
  <name>default</name>
  <uuid>004b96e12d78c30f5aa5f03c87d21e69</uuid>
  <bridge name='brdefault'/>
  <forward dev='eth0'/>
  <ip address='192.168.122.1' netmask='255.255.255.0'>
    <dhcp>
      <range start='192.168.122.128' end='192.168.122.253'/>
    </dhcp>
  </ip>
</network>