Can you look on the adjacent multicast router(s) and see if your host is listed as a group member? Or is this done with just a flat IP network (one subnet)? On Mon, 2004-01-05 at 21:21, Martin Knoblauch wrote: > --- David Stevens <dlstevens@us.ibm.com> wrote: > > > > > Hi David, > > > > > > > Martin, > > If you have other hosts on that network that have sent IGMP > > reports, > > then > > the reporter flag will be cleared-- only one member on a network > > needs to > > send > > reports. That doesn't prevent the host from receiving multicasts-- > > presence > > in > > /proc/net/igmp indicates it did join the group. > > OK. I just wondered, because all hosts running the 2.4.20-18.7smp > kernel (RH7.3 errata) show the "1" in the reporter field, while all > hosts running 2.4.22/2.4.23 (vanilla plus NFS fixes from Trond) show > "0". > > > Please send me some details about your set-up and I may be able > > to > > help. > > We are running 21 HP/DL380G3.Each has two internal Broadcom NICs. The > second one (eth1) is used for the Ganglia multicast. > > The kernels are 2.4.22 and 2.4.23 (now .24) with some NFS patches. In > the case of 2.4.24 those are: > > 01-posix_race > 02-fix_commit > 03-fix_osx > 04-fix_lockd3 > 06-fix_unlink > 07_seekdir > > from http://www.fys.uio.no/~trondmy/src/Linux-2.4.x/2.4.23-rc1 None of > those looks like it does something to multicasts. In the worst case I > could try to run with plain 2.4.22/23, but that would have to ait until > Wednesday. > > The kernel-config file is included. > > > First, are the sender and receiver on the same network, or are > > you > > using a multicast router? > > No. All systems are on the same network. > > > Second, can you send me a tcpdump-format packet trace > > (preferrably > > only the multicast traffic, and as small as you can make it)? > > What exactely do you want to see? On which box should I run tcpdump? > Which options (I'm not that deep into network debugging :-)? > > > > You mentioned tg3-- have you tried this with other hardware > > that > > worked? > > > > The tg3 works with the 2.4.20-18.7smp (and earlier) kernels. It just > does not work with 2.4.22/23 (did not check 2.4.21). > > Unfortunatelly I have no other boxes to test with. I only can say that > Ganglia never failed in this particular way on any setup. > > Thanks > Martin > > ===== > ------------------------------------------------------ > Martin Knoblauch > email: k n o b i AT knobisoft DOT de > www: http://www.knobisoft.de -- Lawrence MacIntyre 865.574.8696 lpz@ornl.gov Oak Ridge National Laboratory High Performance Information Infrastructure Technology Group
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