*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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