auto lo
iface lo inet loopback
{% for network in vars.network.values() %}

auto {{ network.interface }}
iface {{ network.interface }} inet static
    address {{ network.address }}
    netmask {{ network.netmask }}
{%if "gateway" in network %}
    gateway {{ network.gateway }}
{%endif %}
{% if "dns" in network %}
    dns-nameservers {{ network.dns | join(" ") }}
{% endif %}
{% endfor %}