I have an MX67 with a server containing network drives plugged directly into one port, and another computer plugged into another port. There are no switches involved. 
 
If I put the server and the other computer in the same VLAN, I can access the network drives just fine. 
 
However, if I put them in different VLANs, I lose access to the drives in the server. 
 
Does anyone know how I could address this? The use case for this would be to allow VPN clients in a different subnet to access the network drives.