Disable Teredo for Cluster Validation

When you setup a cluster for Exchange 2007 CCR on Server 2008, you may find that it doesn?t validate because of IP Address duplication.

Often this turns out to be due to IPv6 NAT type technology called Teredo.

The blog post below tells you what to do!

http://blogs.msdn.com/clustering/archive/2008/07/26/8773796.aspx

Basically unless you need it, run:

netsh int teredo set state disabled

Cheers

Nathan