How to make remote IPs available on OS X’ PPTP VPN connections

OSX VPN RoutingLet me describe the initial situation: I connect my Macbook via PPTP VPN with an remote network using the standard OSX VPN client. While the VPN connection is established, however, there is the following problem.
All devices on the remote network get IP addresses within the range 10.8.0.0/24 assigned. However, the local IP range on the external network is 192.168.178.0/24. A server, which (as local user of the remote network) can be reached via 192.168.178.11 for example, now (via VPN connection) has the IP 10.8.0.45. Unfortunately it is not clear which server got what IP from the 10.8.0.0/24 block of adresses.
Add routing rule for PPTP VPN connection on OSX
The solution is quite simple in this case. The only condition so that subsequent workaround will be successful is that the IP range in which the Macbook is, is an other than the local range of the external network. If the Macbook is therefore also […]