VPN

Well am abit new to VPNs.

I use monowall as my Firewall/gateway in my Cybercafe.  I run a Captive Portal for authenticanting and accounting clients who come with their own laptops.  I would like to use an existing WAN (Alvarion BreezeAccess) to add more accesspoints and have them go through my Monowall captive portal in the cybercafe for Authentication and Accounting. I would like to keep my existing database for that.

I have tested a VPN (PPTP) connection and am able to connect to the Cyber cafe Monowall + access the Internet but not through the captive portal.

What I would like to see is: in the event of a succesifull VPN connection, the client should see a Captive portal Splash Screen when she attempts to access the web.