[Users] Using multicast in virtual servers

Kirill Korotaev dev at sw.ru
Wed Sep 26 03:15:13 EDT 2007


Daniel Pittman wrote:
> Kirill Korotaev <dev at sw.ru> writes:
> 
> 
>>Is the same setup working without openvz?  Have you used multicast
>>before? Multicast is a bit complex to set up, requires support from
>>routers/switches etc., so this might well be not openvz-related.  But
>>we setting up this test case right now to check ourselfes.
>>
>>Can you please also provide a bit more information about your
>>configuration like whether you use bridge for veth-eth0 traffic
>>bridging or routed networking, any configuration options (including
>>sysctl) you used/changed etc.?
> 
> 
> One thing that is worth noting: I found a bug in the ... veth code, I
> think, where it wouldn't pass a multicast packet through.  The code
> checked with the 'is_broadcast' flag, for a matching mac, and assumed
> that anything else was not for this host.

plz make sure you really use and look at the sources of 028stab039 kernel.
this check in veth_xmit() was fixed in 028stab034 with this commit:
http://git.openvz.org/?p=linux-2.6.18-openvz;a=commitdiff;h=993241dcdfc8ae22d339e08ed78db6e9760b1d89
> 
> Perhaps this is a similar issue?  I can try to dig out the fault report
> if it helps, but at the time it was simply changing is_broadcast to
> include an is_multicast test on the Ethernet MAC.

and it started to work?

Thanks,
Kirill




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