Hi Tomy,
I assume your talking about this article?
Setup a VPN – PPTP Host On Your Home Windows 7 PCThe first thing I would do is eliminate all the variables. Let's first make sure everything is working before you introduce any more complexity such as the Internet or your work network etc...
First, put the Laptop onto the same network as your Tower (your home network). Probably best to plug into the same network switch or hub etc..
Next, try to VPN into your tower. Your just double checking here to make sure everything is working. You should be able to point right at the IP of the Tower from your laptop and get logged into VPN. If this works, then your ready for the next test which is to unplug the laptop from your home network and into your Sprint card.
With the sprint card up and running on your laptop (be sure you unplugged from your home network) make sure you can get to google.com (test internet connectivity).
Now from your Tower, log into your TW623BRP router and get the external IP address. That's the IP you will point your VPN client to on your Laptop.
Now from the Tower, log back into your Trendnet router and make sure the VPN ports (1723???) are forwarding to your Tower machine.
What your doing here is your telling the Router - If anyone connects to the Router using XXX port (1723), forward the traffic to this IP address inside my internet network. So basically it will look like this:
Client -> Sprint Card -> Internet -> Home Router ----> Port 1723 ---> Tower running
VPN hostOnce the router is configured,
follow the steps in the Windows 7 VPN host article and see if it works.
You good?