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[Jiajun Liu <jiajun@xxxxxxxxxxxxxxx>]

when we ping VM from hypervisor, the hypervisor will use the shared dhcp
address as source ip address. however, the  ebtables rule added in
https://review.openstack.org/#/c/16578/ will drop those packets who's
source ip address is shared dhcp address. so we can not ping VM from
hypervisor. We need to change the ebtable rules in order to allow the
hypervisor to ping VM.

** Changed in: nova
       Status: Invalid => Confirmed

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https://bugs.launchpad.net/bugs/1176248

Title:
  share_dhcp_address patch results in hyp unable to ping VM on another
  hyp

Status in OpenStack Compute (Nova):
  Confirmed

Bug description:
  We have openstack folsom installed on ubuntu in multi_host mode.

  We decided to apply the shared_dhcp_address patch because we were using a lot of small tenants on a medium-ish cluster
  (50+ compute nodes).

  https://review.openstack.org/#/c/16578/

  
  However after application of the patch we found that the hypervisor is unable to ping a VM on another hypervisor.
  Before the patch this was working successfully.

  Can anyone throw some light as to what could be happening here.

  
  The ICMP packet does reach the VM and VM tries to send a ICMP echo reply but instead gets back an error saying destination
  not found.

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