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Microsoft Resource Kits - Windows 2003 Resource Kit

Mcast.exe  (Windows 2003 Resource Kit)

The Window Server 2003 Resource Kit is a set of tools that system administrators and engineers use to manage or support a Windows Server 2003 system. Use it to streamline management tasks such as troubleshooting operating system issues, managing Active Directory, configuring networking and security features, and automating application deployment.
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.