Before starting Kerberos configuration with your SharePoint 2010 environment I recommend reviewing the following articles:

• http://download.microsoft.com/download/B/B/F/BBF0C6F3-6E36-4979-8C43-DE165AD7AE34/SP2010%20Kerberos%20Guide.docx Configure Kerberos Authentication for SharePoint 2010 Products

• http://technet.microsoft.com/en-us/library/gg502602(v=office.14).aspx Configuring Kerberos authentication: Core configuration (SharePoint Server 2010)

• http://support.microsoft.com/kb/2722087 How to configure Claim to Windows Token Services in SharePoint 2010 with Kerberos Authentication

• http://msdn.microsoft.com/en-us/library/hh231678.aspx Claims to Windows Token Service (C2WTS)
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