Multicast Forwarding

[Loren M. Lang]

On Thu, Jul 22, 2004 at 02:56:41PM +0200, Albert van Dam wrote:
> Hi All
> 
> I am a newbie to FreeBSD.
> 
> We have the following setup in a lab environment:
> * PC1 (IP: 192.168.10.2/24) connected with cross over to wireless router
> A (IP: 192.168.10.1/24 - sis0)
> * PC2 (IP: 192.168.20.2/24) connected with cross over to wireless router
> B (IP: 192.168.20.1/24 - sis0)
> * Wireless router A (IP: 192.168.30.1/24 - wi0) connected with 802.11b
> to Wireless router B (IP: 192.168.30.2/24 - wi1)
> 
> PC1 can ping PC2 and PC2 can ping PC1.
> Both Wireless router A and Wireless router B runs FreeBSD. The routing
> on this works but I cannot get UDP Multicast packets through. I have
> read in the FreeBSD docs that mrouted should be running and subsequently
> I have it running on both routers.
> 

I think that mrouted will only forward multicast packets that it knows
another interface is subscribed to so network A would have to tell the
router an IGMP packet subscribing to the multicast channel you're
talking on on network B, and vice-versa.  Not sure how to generate the
IGMP packet, it's been a while since I worked with multicast.

> Tcpdump shows the UDP multicast packets on Wireless router A from PC1 on
> sis0 and UDP multicast packets on Wireless router B from PC2 on sis0. 
> 
> Any help would be greatly appreciated.
> 
> Albert
> 
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