* Re: [Bugme-new] [Bug 14677] New: multicast client application does not receive packets
[not found] <bug-14677-10286@http.bugzilla.kernel.org/>
@ 2009-11-23 22:31 ` Andrew Morton
0 siblings, 0 replies; only message in thread
From: Andrew Morton @ 2009-11-23 22:31 UTC (permalink / raw)
To: netdev; +Cc: bugzilla-daemon, bugme-daemon, berndp
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On Mon, 23 Nov 2009 22:00:45 GMT
bugzilla-daemon@bugzilla.kernel.org wrote:
> http://bugzilla.kernel.org/show_bug.cgi?id=14677
>
> Summary: multicast client application does not receive packets
> Product: Networking
> Version: 2.5
> Kernel Version: 2.6.31.4-2.6.32-rc8
> Platform: All
> OS/Version: Linux
> Tree: Mainline
> Status: NEW
> Severity: normal
> Priority: P1
> Component: IPV4
> AssignedTo: shemminger@linux-foundation.org
> ReportedBy: berndp@optonline.net
> Regression: Yes
>
>
> When upgrading the kernel from 2.6.29.1 to 2.6.31.4, we discovered that packets
> no longer get delivered to an application that is subscribing to the multicast
> data.
>
> We verified that multicast support was compiled into the kernel
> (CONFIG_IP_MULTICAST). A dump on the interface with tcpdump shows the multicast
> packets arriving on the network interface. However, they do not get delivered
> to the application.
>
> /proc/net/igmp clearly showed that we were subscribed to the relevant multicast
> groups, and netstat showed that the application was listening.
>
> Upgrading to 2.6.32-rc8 did not fix the problem, but downgrading to 2.6.29.1
> did.
>
> This problem was seen on two different supermicro systems: one with a single
> (4-core) i7 940 Intel CPU, and another one with dual X5570 Xeon CPUS. In both
> cases the interface was on a quad-port NIC card 82571EB gigabit ethernet
> controller, rev 06.
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