Region : UnitedStates

Model : TL-R600VPN

Hardware Version : V1

Firmware Version :

ISP :

I have a pair of TL-R600VPN routers. I plan to use them as a secure tunnel between two sites. That configuration would be IPSec with the appropriate values.
I am able to configure this connection. When my laptop is hardwired into either of the routers, I hav access to servers under both routers.

Now I want to access this VPN from the Internet. I have tried three different clients (GreenBow, Shrew Soft and Windows 7 PPTP).
I have not found a client that can connect my laptop to my VPN from the internet.
Does anyone have a client and client configuration that will work for the TL-R600VPN router?

Thanks