Network design with DMZ, Intranet and firewall

I am designing a new network that has a DMZ containing Linux Web servers behind a firewall separating the DMZ from a Windows back office. I want to run our company Intranet on the DMZ side using Linux, but I want to limit access to employees both from the Internet and behind the firewall using Windows 2003 logon authentication. Is this doable? How do I configure the firewall? Are there any resources out there that you can point me to?
This is a pretty common request these days and the answer is not that difficult. What you want to do is configure a proxy server; I would suggest you look at Squid to proxy your traffic and then authenticate the traffic from your Windows 2003 logon authentication database using Samba. Here's a link to Proxy Authentication with Squid.

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This was first published in March 2005

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