L2TP - naked without encryption.

And if possible, you can implement the L2TP protocol in this client - naked without encryption. (there is no common IPSec key at all). This protocol is used by some Internet providers. The server for this, it seems, is on xl2tpd (1.3.18-1build2). Any old router can be used as a client (for example, tp link 941nd or dlink dir100). Authorization: IP server and login with password (and nothing else). I could not find a Windows 10 client anywhere to use without a router. It is impossible to connect using Windows. Third-party clients (at least for Windows) are absent.