I am working on an implementation of Unified Access Gateay (UAG) SP1 for our DirectAccess implementation here at the board.
The TechNet articles in the deployment guide specify that you must use NLB in Unicast Mode for the deployment. The guide is located at http://bit.ly/tirUga
If you are using VMWare to host your UAG Array, you know that Unicast NLB has its issues. After doing some searching I discovered this Blog, http://bit.ly/sX7sgX which says that you can use multicast NLB for UAG Sp1 and that the documentation is incorrect.