I am having problems with getting PIM-SM v2 multicast routing working under Linux 2.4.20. I think that I may be missing an obvious configuration step. I have pimd running on several machines, which are also OSPF routers. I have set up some default routes for multicast addresses, just to stop the networking code complaining, though obviously these are not on all interfaces. A <-> B <-> C <-> D Output from pimd -d all, shows that all of the machines are aware of each other. However, when I use mtrace from machine A e.g. mtrace ipmachineD 224.0.1.10 then it fails. Similarly, with other multicast applications such as VideoLAN. Multicast routes handled by PIM are also not shown by ip route. Any thoughts? I have not seen much multicast work happening on Linux for a while, since the days of Mbone. Is this the case? I want to run IPv4, so an IPv6 multicast solution doesn't help. Regards Andrew