vpn-with-nps

http://www.windows-server-2012-r2.com/vpn-with-nps.html

https://technet.microsoft.com/ru-ru/library/dd469733(v=ws.11).aspx

http://openbook.rheinwerk-verlag.de/windows_server_2012r2/14_001.html#dodtp8b7e92cd-fd3d-4f34-baea-ef48c26195df

https://anonymweb.de/vpn-protokoll-vergleich-pptp-vs-l2tp-vs-openvpn-vs-sstp-vs-ikev2/