Help - Configure AD to accept xauth authentication for IPSec VPN

I have been tasked with setting up our Sonicwall firewwall's IPSec VPN to use xauth with Active Directory for additional authentication.  Has anyone done this before? Have suggested steps to accomplish this so that AD will accept authentication from an external source like a Sonicwall Firewall?

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I have set this up with Cisco PIX/ASA's. I use IAS (RADIUS) within Active DIrectory. It's very easy to setup and works great. Here's a Sonicwall PDF that shows how to setup IAS to work with Sonicwall:
Hope this helps !!!

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