<https://www.abcxperts.com/docs/cual-es-la-diferencia-entre-un-tunel-l2tp-e-ipsec/#breadcrumb>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.abcxperts.com/docs/cual-es-la-diferencia-entre-un-tunel-l2tp-e-ipsec/>