[PVE-User] VLAN and 4.2 upgrade

Adam Thompson athompso at athompso.net
Fri May 6 21:33:11 CEST 2016

On 16-05-06 02:30 PM, Adam Thompson wrote:
> On 16-05-06 10:03 AM, Michael Rasmussen wrote:
>> On Fri, 6 May 2016 09:22:56 -0500
>> Adam Thompson <athompso at athompso.net> wrote:
>>> Has this bug 
>>> (http://openvswitch.org/pipermail/discuss/2015-July/018242.html) 
>>> ever been found & fixed?
>>> If not, using OVS in this scenario will still break your cluster 
>>> horribly.
>>> It causes no problem whatsoever with a single non-clustered host.
>>> Also, AFAIK, OVS *still* doesn't implement an IGMP querier, so if 
>>> you were relying on the Linux Bridge IGMP querier (like I am), 
>>> you're screwed there, too.  (My switches support IGMP snooping, but 
>>> my router doesn't have an IGMP querier.)
>> What kind of switch do you have?
> A pair of NetGear GS752TXS switches.
> They do have an IGMP querier feature, but AFAIK it is only active when 
> you've configured them as the router (layer 3 functions), and I'm only 
> using them as layer 2 devices because the L3 implementation is, um, 
> not useful.  IGMP snooping works properly in L2 mode regardless.
> The router/firewall is pfSense, which does IGMP proxying, but 
> apparently not querying... or at least not correctly :-/.
> -Adam

Well, as usual, I figured out how to make the switch act as a querier 
and NOT a router about 60 seconds after I hit send.
Aaargh.  So that's a non-issue now.

On the other hand, I still have concerns about the way OVS was handling 
multicast packet checksums incorrectly, which was causing cluster failures.


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