Re: Any changes in Multicast code between 2.4.20 and 2.4.22/23 ?
From: Martin Knoblauch (knobi_at_knobisoft.de)
Date: Mon, 5 Jan 2004 18:21:22 -0800 (PST) To: David Stevens <firstname.lastname@example.org>
--- David Stevens <email@example.com> wrote:
> If you have other hosts on that network that have sent IGMP
> the reporter flag will be cleared-- only one member on a network
> needs to
> reports. That doesn't prevent the host from receiving multicasts--
> /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
> Please send me some details about your set-up and I may be able
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:
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
The kernel-config file is included.
> First, are the sender and receiver on the same network, or are
> using a multicast router?
No. All systems are on the same network.
> Second, can you send me a tcpdump-format packet trace
> 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
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.
email: k n o b i AT knobisoft DOT de
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