driver: macvlan
    driver_opts:
      parent: ${internal_interface}
      com.docker.network.enable_ipv6: "${enable_ipv6:-false}"
    ipam:
      config:
        - subnet: ${internal_subnet}
          gateway: ${internal_gateway}
{{ if len "${internal_subnet6:-}" }}
        - subnet: ${internal_subnet6}
          gateway: ${internal_gateway6}
{{ end }}