{# Loopback interface must be present so define it here if none exists. #}
{% if interfaces | rejectattr("name", "==", "lo") %}
auto lo
iface lo inet loopback

{% endif -%}

{# Skip disabled and OOB management interfaces. #}
{# For VMs we have to set the attribute manually (to false) so rejectattr works. #}
{% for iface in interfaces
    | defaultattr('mgmt_only')
    | rejectattr('mgmt_only')
    | selectattr('enabled') %}
auto {{ iface.name }}
iface {{ iface.name }} inet {% if iface.name == "lo" %}loopback{% else %}static{% endif +%}
{% if iface.mtu %}
    mtu {{ iface.mtu }}
{% endif %}
{% for address in iface.ip_addresses %}
    address {{ address.address }}
{% if address.family.value == 4 %}
{% set subnet = address.address | ipaddr('subnet') %}
{% set prefix = prefixes | selectattr('prefix', '==', subnet) | first %}
{% set gateway = prefix.custom_fields.gateway.address %}
{% if gateway is defined and gateway != address.address %}
    gateway {{ gateway | ipaddr('address') }}
{% endif %}
{% endif %}
{% endfor -%}

{# disable SLAAC if we have a manually set IPv6 address #}
{% if iface.ip_addresses | selectattr("family.value", "==", 6) %}
    pre-up echo 0 > /proc/sys/net/ipv6/conf/$IFACE/autoconf
{% endif %}

{% endfor -%}

source-directory /etc/network/interfaces.d