Johnny Billquist wrote: Kari Uusim ki wrote: The multicast address AB 00 00 03 00 00 is to all Phase IV routers (=endnode hello) The multicast address AB 00 00 04 00 00 is to all Phase IV endnodes (=router hello) All Level 1 and Level 2 routers should send router hellos to endnodes and endnodes should send endnode hellos so that routers know of all endnodes. Sigh. Why don't people read what I write? Note that *all* machines sends hello messages to AB 00 00 03 00 00. Only level 2 routers sends anything on any other address, but they send on AB 00 00 03 00 00 too. And ignore that. I was using a too small sample when I wrote, so it wasn't the full picture of things... Johnny