DMZ - IIS AD Authentication

Hi Experts,

We have a web server (Windows 2008 R2 - IIS 7) that sitting inside the DMZ. And we have a web application that requires an AD authentication (users login using their domain username and password).

What is the best practie to achive this?
RODC? ADFS? or is there any other way?
Can you also please help me with the step by step? (please note that we don't have an ISA server)

AD Authentication from DMZ is a new thing for me; so I need a detailed explanation.

Thanks very much.

Cheers
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DAHITSydneyAsked:
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p_nutsCommented:
There's a couple of ways you can do this.

1 an authentication webservice
With this you basically build a web service that receivesa user and pwd and runs it to a dc to check.
2 an rodc in the dmz ..
3 federation services

In any case you need some dmz machine to operate on it.  
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DAHITSydneyAuthor Commented:
thank you
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