Point to point tunneling protocol is a method for implementing virtual private network .PPTP used controll channel over TCP and GRE and encalsulting ppp packet.PPTP have many kind of security variability key establishment.
This video provide step by step mikrotik router remote access vpn server configuration. For example we setup a PPTP VPN service.
http://mikrotikroutersetup.blogspot.com/2014/02/mikrotik-router-pptp-remote-access-vpn-server.html
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