The Point-to-Point Tunneling Protocol is a method for implementing virtual private networks.
PPTP
uses a control channel over TCP and a GRE tunnel operating to encapsulate PPP packets.
$ modprobe ip_nat_pptp
$ git clone https://github.com/vank3f3/pptpd.git
$ cd pptpd
$ docker-compose up -d
$ docker-compose logs -f
Connect PPTP server using vpnuser:vpnpassword
with NO mschap-v2/mppe-128
encyption.