Hi Currently we are using Win2008 R2 DC and DNS. We have thousands of users who joins to domain – some PC are formatted and join with deferent name etc. I am looking for tools through which I can clean our DNS I could see that some machines in DNS takes same IP for other machines. Even I flush DNS regularly but no effects in records. I was reading about DNS scavenging – any suggestion ? Thanks

DNS scavanging is the best method http://blogs.technet.com/b/networking/archive/2008/03/19/don-t-be-afraid-of-dns-scavenging-just-be-patient.aspx http://www.virmansec.com/blogs/skhairuddin

Enabling DNS Scavenging should solve your problem. In addition to Syed, check this article. Thanks