I am trying to gain remote access to machines I manufacture that contain simple ethernet based devices like PLCs and Touch Screens. My plan is to install a small mikrotik router in every machine that will log into a cloud based VPN server, then I log into the same VPN server from my PC (thousands of miles away) and hope to gain LAN style access to my on-site devices.
I have a cloud based vpn server setup, and I can log in with the standard windows PPTP client. That side is working and I can ping the server on 10.0.0.1. 
Now I am trying to setup a mikrotik router on my test bench to log into the VPN server which should me to access the simple devices connected to any of the LAN ports.
I have managed to create the PPTP client interface and its status is connected. I can ping the server from the mikrotik terminal.
Now I need to route all traffic to or from any of the lan ports, through the VPN.
I have no idea how to do that. 
I will be halfway there if I can ping the VPN server (10.0.0.1) from a windows machine plugged into the lan ports, (without using the windows vpn client).
This surely must be a simple task but so far I’m coming up blank.
Any help would be greatly appreciated!
I guess you’re there already, but in case you’re not: you have to
- Check “add default route” in your VPN setup
- Masquerade internal network into the VPN interface. Like here http://wiki.mikrotik.com/wiki/Policy_Base_Routing
Thanks Agathis.
“Add default route” was what it needed.
Then I had to add a static route in my cloud server to send traffic destined for 192.168.88.x via the address of a specific router ( eg. 10.0.0.55)