I want to deploy vpn service for home users to access to intranet network.

Users will first connect through an ISP service, and then to an authentication server to 
access to my intranet. With this solution, users must authenticate twice :
- first to the ISP to authorize access to Internet
- Second, to the authentication Gateway to authorize access to the Intranet.

Then, after authentication, we build vpn between home user and the Gateway. With this 
solution, people have to learn 2 passwords ( for ISP and for my Gateway ).
Has any body a solution to enter only one password ?


VPN is sponsored by SecurityFocus.com