How do I set up a multicast tunnel?

[David Huang <khym%azeotrope.org@localhost>]

Hi, I'm looking for info on how to set up a multicast tunnel between a  
NetBSD-current machine and a Linux machine. Is mrouted the way to go,  
or is there something better/easier now? I've seen mention of  
tunneling through GRE, but I'm not sure on the details.

Both machines are serving as NAT devices for their respective LANs and  
are connected to the public internet. There's also an IPsec tunnel  
between the two. The multicast tunnel doesn't have to go through  
IPsec, but it would be nice. I think I saw some Linux documentation  
saying that one could simply set up the IPsec SPDs entries to have  
traffic directed to 224.0.0.0/4 go through the tunnel, but IIRC, that  
seemed to work on the Linux side, but not on the NetBSD side (I could  
be wrong though; it's been a while since I tried it).

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