Multicast and Xen Bridge Networking issues

Multicast and Xen Bridge Networking issues

[S, Prashanth]

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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


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Re: [Openais] Multicast and Xen Bridge Networking issues

[Steven Dake]

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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