simple multicast routing

I'm trying to set up a Mandriva box acting as a router. I'd like to
force some multicast addresses to leap from one interface to the other
without any IGMP traffic but rather just a static, administrative
setting.

smcroute sounds like the solution, but it doesn't make any claim to
working in the 2.6 kernel. On my first attempt, I couldn't get it to
compile.

http://www.cschill.de/smcroute/

Should I stop barking up this tree and try to force this behavior out
of mrouted or something else?

Thanks for any responses.
DJN