ActiveXperts Network Monitor 2019 proactively manages network servers, devices, databases and more.

Microsoft Resource Kits - Windows 2000 Resource Kit

Nlmon.exe  (Windows 2000 Resource Kit)

The Windows 2000 Resource Kits help IT professionals deploy, manage, and support Windows 2000 operating systems.
There are a number of Windows 2000 Resource Kit software tools available for free download from Microsoft. These tools are listed below, and can help you streamline administrative tasks such as managing Active Directory™, administering security features, working with Group Policy and Terminal Services, automating application deployment, and other important jobs.

Nlmon.exe - NL Monitor
This command-line tool can be used to list and test many aspects of trust relationships. NLMonitor uses the Computer Browser service to enumerate domain controllers. Therefore if browsing is not working correctly, NLMonitor may produce inconsistent results. Also, the computer where NLMonitor is run, and also those providing the browsing services, must share the same protocols that are used by the domain controllers to carry out their domain activity.