Forwarding multicast packets with iptables and multihomed Debian gateway
 

I have a private /28 network that is connected to a public campus network through a dual homed gateway running Debian Squeeze.

Everything is working fine except for one thing. The campus network has a couple of multicast addresses brodcasting television signals, and i wish to have access to those in my private network. In practice this means that i access a specific site and the software on that site will do the rest for me if i had not been on my own private network.

I am not sure what the exact requirements are to be able to do this. Is multicast broadcasted so i just need to tell the gateway to forward specific ip adresses to my network or do i have to tell a router that i wish that multicast addresses in this and this range be forwarded to me?

If the latter is the case, any idea how i can forward these kind of requests to an outside router? Any ideas and sugestions are gladly accepted.

Ok, i have realised that i will have to join a specific multicast group. When using a java applet that tests if multicasting is enabled i was told that it could not access 239.193.224.80:56464

Tomorow after class i will try to open up in iptables for network activity in both directions on that specific IP and see what happends. Even though i have a "plan" i would still like comments on this very much.