ansible-role-network_interfaces/templates/network-interfaces.j2

# interfaces(5) file used by ifup(8) and ifdown(8)

{{ ansible_managed | comment }}

auto lo
iface lo inet loopback

{% for netname,netif in network_interfaces.iteritems() %}
### {{ netname }} ###
auto {{ netif.device }}
{% if netif.hotplug | default(false) %}
allow-hotplug {{ netif.device }}
{% endif %}

{% if netif.bridge is defined %}
iface {{ netif.device }} inet manual
      bridge_ports {{ netif.bridge.ports | default(["none"]) | join(" ") }}
      bridge_stp {{ netif.bridge.stp | default(false) | ternary('on','off') }}
{% endif %}

{% for ipv4 in netif.ipv4 | default([]) %}
iface {{ netif.device }} inet {{ ipv4.method }}
{% if ipv4.method == "static" %}
      address {{ ipv4.address | ipv4('address') }}
      network {{ ipv4.address | ipv4('network') }}
      netmask {{ ipv4.address | ipv4('netmask') }}
      broadcast {{ ipv4.address | ipv4('broadcast') }}
{% if ipv4.gateway is defined %}
      gateway {{ ipv4.gateway | ipv4('address') }}
{% endif %}
{% endif %}
{% endfor %}

{% for ipv6 in netif.ipv6 | default([]) %}
iface {{ netif.device }} inet6 {{ ipv6.method }}
{% if ipv6.method == "static" %}
      address {{ ipv6.address | ipv6('address') }}
      netmask {{ ipv6.address | ipv6('prefix') }}
{% if ipv6.gateway is defined %}
{% if ipv6.gateway | ipv6(ipv6.address) %}
      gateway {{ ipv6.gateway | ipv6('address') }}
{% else %}
      post-up sleep 5; /sbin/ip -family inet6 route add {{ ipv6.gateway }} dev {{ netif.device }}
      post-up sleep 5; /sbin/ip -family inet6 route add default via {{ ipv6.gateway }}
      pre-down /sbin/ip -family inet6 route del default via {{ ipv6.gateway }}
      pre-down /sbin/ip -family inet6 route del {{ ipv6.gateway }} dev {{ netif.device }}
{% endif %}
{% endif %}
{% endif %}
{% endfor %}

{% endfor %}

# Include files from /etc/network/interfaces.d:
source-directory /etc/network/interfaces.d