Sorry this might not be helpful but since we just started testing iAS recently I am not an expertise neither.
Well if iAS works like OAS there should be an config assistant?
If i remember right you could also configure DAD through a browser
With OAS (which is just an older version of iAS as far as I know), you could do it through the web configuration utility, as pando said. Check the docs that came with the iAS.
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