Make a multicast address available outside the LAN

Experts,

Is it possible to make a private multicast address available outside the LAN so anyone can receive the stream? Perhaps NAT it to a public address? Has anyone ever tried to do this? I'm just curious.
typertecAsked:
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mikebernhardtCommented:
A router will not take a private multicast address onto its interface because it is "link local," meaning that it should never leave the LAN. Therefore, it won't NAT it. The only way to do it is to make the multicast address something that is routable.
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typertecAuthor Commented:
Can a multicast address be any routable address? Have you done it before? I would think it is tough to do because the ISPs router will also have to support multicast.
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mikebernhardtCommented:
No. A multicast address must be in the range 224.0.0.0-239.255.255.255.

I just realized that I mixed up 2 things. Link-local and private are completely different. Link-local addresses are in the range 224.0.0.1-255 and will never leave the LAN.

The range for private multicast addresses is 239.0.0.0-239.255.255.255. These are like 192.168.0.0. You CAN do NAT on multicast. But yes, all routers involved MUST support multicast.
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