client machine name from NLB

does anyone know how to get the remote client's machine name when the client browse to my web site? And the site is in NLB.

 i have tried these, but they both return the NLB, not the client's machine name.

Request.UserHostAddress
Request.UserHostName

System.Net.Dns.GetHostName()

System.Net.Dns.GetHostEntry(...)


 

thanks.
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