Routing through host's VNP

[GoldenGate]

Hi,

I have a windows 7 host and Ubuntu 64 bit 14.1 guest. The host connects to an external server using Juniper VPN client. I would like this VPN connection to be shared with the guest. That means, the guess should be able to access servers and services made available through the host's VPN connection. I tried setting up the guess with NAT only, Host Only. None of that worked. The guess can connect to the internet but remains unable to access the VPN services. Any suggestion on how to get this working?

Update: When I use OS X Yosemite as host, things work just great. The guess is able to connect through the VPN connection established by the host. The guess is set up with NAT adapter. The question is why is isn't this working on Windows 8 and Windows 7? What do I need to change to allow this?

Looking forward to your great insight.

Thanks,
Gate.