<https://www.cpolar.com/blog/remote-connection-to-the-ubuntu-system-in-the-external-ssh-no-public-network-ip#breadcrumb>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.cpolar.com/blog/remote-connection-to-the-ubuntu-system-in-the-external-ssh-no-public-network-ip>