Hello,
For thos who like experimenting...
I managed to implement the complete AMPR gateway tunnelling setup on a Mikrotik router by a scheduled script on the router only. Tested on my RB100AHx2 with ROS 6.34.2
You can find it on http://www.yo2loj.ro/hamprojects/ Direct link: http://www.yo2loj.ro/hamprojects/ampr-gw-1.0.txt
Setup details are in the initial comments of the script.
Enjoy. Marius, YO2LOJ