Aman,

You're on the right track when you mention that you've been trying to
set up tunnels. But, what you need is another multicast-capable router
at the *other end* of the tunnel. The possible reasons for setting up a
multicast router are:

	1) To establish a private multicast domain on your own private
	   network

	2) To join the global Internet Mbone

If you're trying to join the Mbone, you need to find someone willing to
provide you with a "feed", and that person's router will be at the other
end of your tunnel. If you're just trying to set up your own private
little multicast domain, then you need to set up other such routers on
other subnets and interconnect them with tunnels. If you just want to
run a little multicast testbed on a single subnet, you don't need any
multicast routers at all! See the Mbone FAQ are:

	http://www.mediadesign.co.at/newmedia/more/mbone-faq.html

for more detailed information on all of this...

Regards,

Fred
templin@nas.nasa.gov