Riaan van Niekerk wrote: > On Thu, 1 Jun 2006, Riaan van Niekerk wrote: > >> Riaan van Niekerk wrote: >>> Is there any reason or advantage to use multicast over broadcast, which >>> offsets the complexity of multicast (relative to broadcast), e.g more >>> control, less traffic, others? >> Generally multicast behaves the same as broadcast. The only time you would >> need multicast is if your nodes are on different subnets - in which case >> you >> would also have to make sure the router had sufficiently low latencies to >> support clustering over it. >> >> > tnx Patrick > > > The RHCS 4 documentation does not give a recommendation for a multicast > address. cman man page and http://sources.redhat.com/cluster/doc/usage.txt > mention 224.0.0.1, which is a non-routable multicast address range, > 224.0.0.0/24 . > > So if I understand this correctly: > > Using this address or anything in the 224.0.0.0/24 range would give the > exact same effect as long as nodes are on the same subnet. If nodes are on > different subnets, a multicast address in another network should be used > (e.g. RHCS 3 defaults to 225.0.0.11). > Exactly. I don't know just how that mcast address got into the documentation but I suspect it's my fault. I do seem to remember giving someone a config file with that address in it at some time :-) -- patrick -- Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
