We have only ever used the membership provider to give users access to our pages. With all the folder protection stuff and roles and so on.

But now we have a public-facing website where both teachers and parents will be connecting from outside the network.

The teachers already have inside-the-network domain usernames and passwords.

How can I have the teachers log in with the same un/pw as their domain un/pw but still have them be part of the membership provider world.

The parents do not have domain un's - so we know we have to give them membership/provider un's.

Is it even a good idea to do what I'm asking? Is this a bad security model?