You might want to put this post up on the
ASPX Professional forum as more of the right people will see if (if don't happen to subscribe to this one).
My understanding is that you can only have one mode of authentication. How are the Intranet users accessing this site? Are they using the same URL?
About the only thing I can think of is that you could create 2 web applications on your server, and make a modification to the web.config for the one used for internal access. Otherwise, the applications would be running exactly the same.
Peter
------------------------------------------------------
Work smarter, not harder.