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Try this. I have been thinking of trying it on C7. http://www.linuxhelp.net/forums/index.php?showtopic=10868

I wouldn't follow the instructions on that link.

Disable iptables? Nah!

The author lumps SELinux and the firewall together.

What is said about DNS is also misleading. DNS is crucial for AD.

Please look at the Samba Wiki instead.