Help with PPTP Server and Client

[vnwind]

Hi,

I am running into little trouble with how to set up VPN passthrough so was hope if someone can point me in the right direction.

Basically I have a asus rt n66 that flash with Fractal;s build DD-WRT so I can have pptp server and client on the router. Then I set it up like this

I can VPN to router from remote PC fine but there is no way i can tell if my VPN client works or not. I can't see the SQL server from my remote PC

Can anyone point out what i am missing or my setting is wrong?

Thanks