## 1. create the PPTP configuration
sudo mkdir /etc/ppp/peers && sudo cat <<EOF > /etc/ppp/peers/pptpvpn
plugin PPTP.ppp
noauth
remoteaddress xxx.xxx.xxx.xxx  # address of the VPN server, in my case: 23.24.218.210
redialcount 1
redialtimer 5
idle 1800
mru 1368
mtu 1368
receive-all
novj 0:0
ipcp-accept-local
ipcp-accept-remote
refuse-eap
refuse-pap
refuse-chap-md5
user USERNAME  # account name of the VPN server, in my case: TestUser2
hide-password
mppe-stateless
mppe-128
looplocal
password THEPASSWORD  # the password provided
nodetach
ms-dns 8.8.8.8
ipparam gwvpn
debug  # future diagnose in case of failure
logfile pptp.log
EOF

## 2. start the connection
sudo pppd call pptpvpn

## 3. direct the traffic, this is the ip address of the remote desktop
sudo route add -host xxx.xxx.xxx.xxx -interface ppp0  # in my case: 192.168.51.12