> The problem being tackled isn't completely clearly defined, but the > general philopshy is that multicast is not being deployed because most > potential receivers are using ISPs that don't supply multicast > service. The proposal is that we need some form of auto-tunnelling > protocol which would allow a receiver to request unicast tunnelling of > multgicast traffic from a replicator somewhere on the > multicast-capable internet. Such proposals have come up repeatedly > over the last ten years. there is a serious contest to see how many mechanisms multicast and v6 can develop to overcome why they are not being deployed. they should get a clue. randy