VPN site to site - Mikrotik to Linux

HI,
I am looking for solution how to configure vpn between two devices:

1x microtik without public IP

1x Linux server with public IP.


The goal is:
I am going to configure pptp server on linux server for remote users and let them reach lan network behind microtik.

Why not visit Greg’s good site

http://gregsowell.com/?p=1290

And of course
http://wiki.mikrotik.com/wiki/Manual:Interface/PPTP