network:
  version: 2
  ethernets:
{% for iface in system_cfg.network.interfaces %}
    lan{{ loop.index0 }}:
{# Unnamed binds the first ethernet by name glob (e* = en*/eth*, netplan match.name takes one glob), never a MAC (#12). #}
      match:
        name: "{{ iface.name if (iface.name | default('') | string | length) else 'e*' }}"
{% if iface.ip | default('') | string | length %}
      addresses:
        - {{ iface.ip }}/{{ iface.prefix }}
{% if iface.gateway | default('') | string | length %}
      routes:
        - to: default
          via: {{ iface.gateway }}
{% endif %}
{% else %}
      dhcp4: true
{% endif %}
{% if loop.index0 == 0 and (configuration_dns_list or configuration_dns_search) %}
      nameservers:
{% if configuration_dns_list %}
        addresses: [{{ configuration_dns_list | join(', ') }}]
{% endif %}
{% if configuration_dns_search %}
        search: [{{ configuration_dns_search | join(', ') }}]
{% endif %}
{% endif %}
{% endfor %}