Strange, I haven't seen this. It sounds like maybe you have a mac address
conflict somehow. The only time I've seen duplicate icmp responses is when I
was running inside of virtualbox and due to the way vagrant was setting up vms,
I had multiple vms with same mac.
Vish
On Oct 14, 2011, at 5:59 AM, Shyam Kaushik wrote:
> Hi Vish,
>
> In our openstack deployment we observe this:
>
> Since linux_net.py/initialize_gateway_device() does this
> # NOTE(vish): If the public interface is the same as the
> # bridge, then the bridge has to be in promiscuous
> # to forward packets properly.
> if(FLAGS.public_interface == dev):
> _execute('ip', 'link', 'set',
> 'dev', dev, 'promisc', 'on', run_as_root=True)
>
>
> Any VM spawned on the cloud controller node if it sends an ICMP ping to an
> external network gets duplicate replies (i.e. there are 2 replies for the
> same ICMP request). For VM’s spawned on any other non-cloud controller this
> doesn’t happen.
>
> If we turn of promiscus mode on the bridge, the VM on cloud controller
> doesn’t see the duplicate replies, but VM’s on non-cloud controller cannot
> reach external network.
>
> Question to you is, is this duplicate ICMP replies expected for VM’s running
> on cloud controller due to above logic?
>
> --Shyam
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