roles/config-virt/templates/virt_net.xml.j2

<network>
  <name>xos-{{ item.name }}</name>
  <bridge name="{{ item.name }}"/>
  <forward/>
  <domain name="{{ site_suffix }}" localonly="no"/>
  <dns>
{% if unbound_listen_on_default %}
{% for host in groups['head'] %}
  <forwarder addr="{{ hostvars[host].ansible_default_ipv4.address }}"/>
{% endfor %}
{% endif %}
{% if dns_servers is defined %}
{% for ns in dns_servers %}
  <forwarder addr="{{ ns }}"/>
{% endfor %}
{% endif %}
  </dns>
  <ip address="{{ item.ipv4_prefix }}.1" netmask="255.255.255.0">
    <dhcp>
      <range start="{{ item.ipv4_prefix }}.2" end="{{ item.ipv4_prefix }}.254"/>
{% if item.head_vms %}
{% for vm in head_vm_list %}
      <host name='{{ vm.name }}' ip='{{ item.ipv4_prefix }}.{{ vm.ipv4_last_octet }}'/>
{% endfor %}
{% endif %}
    </dhcp>
  </ip>
</network>