Netowrking with passwords?

We jsut installed an airport extreme base station into our small office. we'd like to keep the internet sharing open for anyone to use, but we're also wanting to be able to restrict use to our file server, which is also on the network. I know you can set up access control using airport ids/MAC addresses, but with a constantly changing group of users needing to access the server, we'd rather it just be a passowrd thing. is this something we can do through the airport, like share internet, but file server access is password restricted? or do we have to configure the file server to do this?

If you truly want to maintain a fully "open" and unsecured wireless network, then you cannot implement any access restrictions of any kind on the Base Station. You will need to configure password restrictions on the file server itself.
I recommend you reconsider your decision to "keep the internet sharing open for anyone to use" on an office wireless network. This is a major security risk to your entire network - and anyone with enough time will eventually figure out a valid user name and password for your server.

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