[KLUG Members] multicast

[John Pesce]

Hi all,

I posted on this last month. I'm still trying to figure it out and I don't 
use a firewall between my subnets. I can pass TCP/IP traffic between the 
two and I can do multicast on each subnet, but I can't seem to get the 
multicast between them. Please keep me in the loop on this thread.

Thanks,
John

On Wed, 3 Sep 2003, Bert wrote:

> Rusty Yonkers wrote:
> 
> >I have a system with 4 network segments that are connected with a
> >single Linux firewall system... I need to get multicast info from one
> >side of the system to the others.... I have done some research ... it
> >seems like if the kernel is setup to support it (not sure if the
> >stock SuSE 8.2 kernel is) then I might only have to put in a static
> >route.  I read an article that stated that I simply needed to also
> >put in ....
> >....................... section below from article ........
> >
> >So far, so good. We've enabled multicasting. Now, we have to tell the
> >Linux kernel to actually do something with it, so we can start
> >routing. This means adding the Multicast virtual network to the router table:
> >ip route add 224.0.0.0/4 dev eth0
> >
> Your'e only telling here that the 224 network can be reached at the 
> segment attached to eth0. Are you sure that only a 4 bit netmask is 
> right? It seems to me that it should be 20, giving you addresses from 
> 224.0.0.0 up to 239.255.255.255.
> 
> My multicast knowledge seems to be short here, so I don't know if you 
> have to add lines to your firewall such as:
> iptables -A FORWARD -i eth0 -s 224.0.0.0/20 -o eth1 -d 224.0.0.0/20
> and
> iptables -A FORWARD -i eth1 -s 224.0.0.0/20 -o eth0 -d 224.0.0.0/20
> 
> allowing 224.* traffic to travel between eth0 and eth1, but I think you 
> have to do something here.
> 
> 
> Bert.
> 
> _______________________________________________
> Members mailing list
> Members@kalamazoolinux.org
> 
> 

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|                                    Software Engineer               |
|       John Pesce          o     o  Air Traffic Management Lab      |
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