nat-network.xml

<network>
  <name>default</name>
  <uuid>81ff0d90-c91e-6742-64da-4a736edb9a9b</uuid>
  <forward dev='eth1' mode='nat'/>
  <bridge name='virbr0' stp='on' delay='0' />
  <ip address='192.168.122.1' netmask='255.255.255.0'>
    <dhcp>
      <range start='192.168.122.2' end='192.168.122.254' />
      <host mac='00:16:3e:77:e2:ed' name='a.example.com' ip='192.168.122.10' />
      <host mac='00:16:3e:3e:a9:1a' name='b.example.com' ip='192.168.122.11' />
    </dhcp>
  </ip>
</network>