Routing/Bridging intenet traffic between 2 PPTP interfaces

Hi MT community,

My network setup is as follows:
Mikrotik A:

  • PPTP Client that connects to a PPTP Server on Mikrotik B
  • PPTP Client connects successfully and gets a IP address via a secret entry (192.168.1.0/24)
  • This router can access the gateway (192.168.1.1) and all other PPTP clients on Mikrotik B

Mikrotik B:

  • PPTP Server that facilitates PPTP clients such as Mikrotik A

  • A bridge has been setup with an IP to act as a gateway for all the PPTP client connections, between the ethernet port and the PPTP Server interface

  • PPTP Client that connects to a PPTP Server on Mikrotik C

  • PPTP Client connects successfully and gets a IP address via a secret entry (192.168.100.0/24)

  • This router can access the gateway (192.168.100.1) on Mikrotik C

  • Internet traffic gets routed successfully on the PPTP Client interface to Mikrotic C with a default routing entry 0.0.0.0/0

Mikrotik C:

  • PPTP Server that facilitates PPTP clients such as Mikrotik B
  • ADSL Modem connection to facilitate internet traffic
  • No problem on this router

My problem is to get traffic routed from the PPTP Server interface on Mikrotik B to the PPTP Client interface on Mikrotik B so that it can be passed to Mikrotik C

If the above is not clear enough, I can also draw a diagram to illustrate the setup.

I have been trying for the last few days to set this up to no avail.
Any help will be greatly appreciated.