This reflector, implemented first by Luc Beurton from Université de Bretagne Sud (France), makes it possible to convert an IPv6 multicast flow to an IPv4 multicast flow and vice-versa. A site can then transmit a conference on the M6Bone and then use the gateway to transmit it also on the IPv4 multicast network. With this technology, the transmitting site does not need to send 2 different streams.
Another implementation was created by Konstantin Kabassanov and is available on his web page.
Download the reflector: