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I have setup a secondary domain controller with server 2000 and would like to find out ways to confirm the functionality.I don't have ant error in the log but is there a way to understand if it is working beside unplugging the Ethernet cable from primary?

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Temporarily disable Netlogon service on primary DC and see if 2nd DC processes authentication requests. – Volodymyr M. Nov 28 '12 at 9:37

You will have to monitor the DC long enough to determine if it’s being used or not. Here are a couple tools I suggest.

Use NetMon or Wireshark to capture network traffic. You can capture all inbound LDAP queries on a specific DC and build a list of source addresses.

You could try using AD Insight

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