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mdd stands for multicast data dump. It was designed for distributing 
a file using multicast. The primary goal was to replicate a hard disk
image on all the workstations of a computer room at the same time.

The protocol used is rather simple and will not make any effort to avoid
flooding your network. IGMP-snooping enabled switches are advised.

WARNING: this tool is designed to operate on a private LAN where no
congestion occurs. It has no rate limiting feature, which makes it 
unsuitable for use on the Internet. Do not try to use it outside of
a private LAN, it will attempt to eat all your bandwidth to flood the
multicast group you send data to.