Check out SteelBelted RADIUS from Funk. They are an OPSEC partner, and will likely have a solution to fit your needs. If you're unfamiliar with OPSEC, there's a link from Checkpoint's page to OPSEC. I can't be more specific without understanding your network better.
>I would like to realize a VPN using the login and password
>(I have more than 5k users)I have on a Win2K.
>I would like to use a CheckPoint Firewall on Solaris.
