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Date: Mon, 23 Nov 2009 14:31:55 -0800 From: Andrew Morton <akpm@...ux-foundation.org> To: netdev@...r.kernel.org Cc: bugzilla-daemon@...zilla.kernel.org, bugme-daemon@...zilla.kernel.org, berndp@...online.net Subject: Re: [Bugme-new] [Bug 14677] New: multicast client application does not receive packets (switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface). On Mon, 23 Nov 2009 22:00:45 GMT bugzilla-daemon@...zilla.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@...ux-foundation.org > ReportedBy: berndp@...online.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. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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