Multicast Forwarding

[Albert van Dam]

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.

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