* multicast traffic no longer working after reboot
@ 2014-07-31 13:22 Dennis Jacobfeuerborn
2014-07-31 15:24 ` Dennis Jacobfeuerborn
0 siblings, 1 reply; 2+ messages in thread
From: Dennis Jacobfeuerborn @ 2014-07-31 13:22 UTC (permalink / raw)
To: netfilter
Hi,
today a couple of Hypervisors got restarted due to a power outage. While
the systems and the VMs on the are running fine multicast traffic
between the guests is no longer working.
I generate multicast udp packet using iperf in the guest and check on
the host using tcpdump:
tcpdump vnet0 => multicast packets are visible
tcpdump vlanbr8 => multicast packets are visible
tcpdump em1.8 => no multicast packets visible
vlanbr8 is the bridge, vnet0 the interface of the guest and em1.8 the
physical interface for vlan 8.
I compared the settings in /sys/class/net/vlanbr8/bridge/multicast_*
with a system where multicast works fine and see no differences. brctl
showstp also shows "mc router" to be 1 for both interfaces and the
bridge. All settings in /proc/sys/net/bridge/* are 0.
Any ideas why the bridge doesn't seem to forward multicast packets?
iperf with unicast udp also works fine so it's just multicast that is
the problem.
Regards,
Dennis
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: multicast traffic no longer working after reboot
2014-07-31 13:22 multicast traffic no longer working after reboot Dennis Jacobfeuerborn
@ 2014-07-31 15:24 ` Dennis Jacobfeuerborn
0 siblings, 0 replies; 2+ messages in thread
From: Dennis Jacobfeuerborn @ 2014-07-31 15:24 UTC (permalink / raw)
To: netfilter
On 31.07.2014 15:22, Dennis Jacobfeuerborn wrote:
> Hi,
> today a couple of Hypervisors got restarted due to a power outage. While
> the systems and the VMs on the are running fine multicast traffic
> between the guests is no longer working.
>
> I generate multicast udp packet using iperf in the guest and check on
> the host using tcpdump:
>
> tcpdump vnet0 => multicast packets are visible
> tcpdump vlanbr8 => multicast packets are visible
> tcpdump em1.8 => no multicast packets visible
>
> vlanbr8 is the bridge, vnet0 the interface of the guest and em1.8 the
> physical interface for vlan 8.
>
> I compared the settings in /sys/class/net/vlanbr8/bridge/multicast_*
> with a system where multicast works fine and see no differences. brctl
> showstp also shows "mc router" to be 1 for both interfaces and the
> bridge. All settings in /proc/sys/net/bridge/* are 0.
>
> Any ideas why the bridge doesn't seem to forward multicast packets?
> iperf with unicast udp also works fine so it's just multicast that is
> the problem.
>
> Regards,
> Dennis
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>
I did some further testing and strangely enough after booting the HV and
the guest things work as expected but after 2-3 minutes I suddenly don't
see the the packets anymore on em1.8. This is really bizarre behavior.
Regards,
Dennis
^ permalink raw reply [flat|nested] 2+ messages in thread
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