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[Bug 1824504] [NEW] arp responder will be created for a vlan port when port ip changed

 

Public bug reported:

When the env contains both vlan and vxlan networks, if we enable l2pop and arp_responder function, when we update a vlan port's ip(VM1), the arp responder for this port will be created in br-tun.
When other compute‘s vm(VM2) ping VM1, the first arp destination is ff:ff:ff:ff:ff:ff, so every compute node will get this arp request, and because of arp responder, they will all create a arp reply to the VM2, all these arp reply packets will confuse physical switch, this will cause some network connection problem.

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1824504

Title:
  arp responder will be created for a vlan port when port ip changed

Status in neutron:
  New

Bug description:
  When the env contains both vlan and vxlan networks, if we enable l2pop and arp_responder function, when we update a vlan port's ip(VM1), the arp responder for this port will be created in br-tun.
  When other compute‘s vm(VM2) ping VM1, the first arp destination is ff:ff:ff:ff:ff:ff, so every compute node will get this arp request, and because of arp responder, they will all create a arp reply to the VM2, all these arp reply packets will confuse physical switch, this will cause some network connection problem.

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