UDP multicast stream and NAT

Linux Advanced Routing and Traffic Control

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Hi, my ISP is streaming some local concert using UDP
multicasting. I followed the instructions on the site which
described how to set VLC in order to view the stream, but
it didn't work. I am behind a Linux router/firewall doing
NAT. Using google, I quickly found out that the
netfilter/conntrack code doesn't support NATing multicast
traffic. I thought about bridging the internet facing
interface (eth0) and (one of) the internal interfaces (the
one my computer is plugged into). This way I could set my
IP to be public and no routing/NAT would be done on the
Linux box. The only problem is that the box has 2 more NICs
in it and there are other people connected to those NICs
that need to use that connection (hence need to be NATed).

Then I tried thinking about a DMZ-like solution where my
box would be in the DMZ, but I can't see that working
either because I only have one public IP assigned.

Can anyone think of any other way for me to be able to view
the stream?

Thanks.

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