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[Xen-devel] Re: [Openais] Multicast and Xen Bridge Networking issues



On 05/26/2010 02:24 AM, S, Prashanth wrote:
We have two (physical) machines. Each of them is hosting one Linux
Virtual Machine (HVM) on top of Xen Hypervisor 3.4.1, The VMs are able
to communicate with each other (using Xen Bridge Networking) thru the
ethernet on the physical hosts. However, Corosync (part of OpenAIS HA
suite) in VM is not able to detect and communicate with the other VM. We
are not seeing any messages exchanged between the nodes. We found that
corosync generated multicast messages are reaching the (Xen virtual)
bridge. However, the bridge is not forwarding the UDP multicast messages
to the ethernet. Does anybody know how to make multicast traffic flow
across Xen Bridge? Also do we need any special route setting to achieve
multicast routing between VM hosted on different machines.

Regards,

Prashanth



Most common problem for these symptoms is that iptables is turned on in the host OS. Verify iptables is configured correctly on the host, and then we can talk more after that.

Regards
-steve



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