nat-network-no-hosts.xml

<network>
  <name>default</name>
  <uuid>81ff0d90-c91e-6742-64da-4a736edb9a9c</uuid>
  <forward dev='eth0' mode='nat'>
    <interface dev='eth0'/>
  </forward>
  <bridge name='virbr0' stp='on' delay='0'/>
  <dns forwardPlainNames='no'/>
  <ip address='192.168.122.1' netmask='255.255.255.0'>
  </ip>
</network>