{% set ip4hex = item.value.ipv4_network | ipaddr('net') | ipaddr(magic) | ipaddr('address') | ip4_hex() -%}
{% set mac = '0210' + ip4hex -%}
#
# {{ ansible_managed }}
#
auto {{ item.key }}BR
iface {{ item.key }}BR
    hwaddress {{ mac | hwaddr('linux') }}
    address {{ item.value.ipv4_network | ipaddr('net') | ipaddr(magic) | ipaddr('ip/prefix') }}
{% for ip_type, ip_list in item.value.ipv6.iteritems() %}
{% for ip in ip_list %}
    address {{ ip | ipaddr('net') | ipsubnet(64, 0) | ipaddr(magic) | ipaddr('ip/prefix') }}
{% endfor %}
{% endfor %}
    bridge-ports {{ item.key }}BAT