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Microsoft Resource Kits - Windows 2000 Resource Kit

Mcast.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.

Mcast.exe
This command-line tool can be used to send multicast packets or to listen for packets being sent to a multicast group address. Mcast is useful for testing whether or not there is multicast connectivity between two computers on your network. This can be done by using Mcast to send packets from one of the computers on your network to the group address you wish to test. On the computer for which you want to test connectivity, you can use Mcast to listen for packets received on the group address. Using this method, you can determine whether or not there is multicast connectivity between the two computers.