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[Slawek Kaplonski <1926515@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

It happens with ML2/OVN backend only. In ML2/OVS with both openvswitch and iptables_hybrid fw drivers it works fine as we are explicitly adding proper SG rules for to allow DHCP requests from VM always.
I think it's regression after https://review.opendev.org/c/openstack/neutron/+/733886 as we still have add_acl_dhcp() method but it's not used anywhere.

** Affects: neutron
     Importance: Medium
     Assignee: Slawek Kaplonski (slaweq)
         Status: In Progress


** Tags: ovn

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https://bugs.launchpad.net/bugs/1926515

Title:
  DHCP for VM fails when removing security group default rules

Status in neutron:
  In Progress

Bug description:
  It happens with ML2/OVN backend only. In ML2/OVS with both openvswitch and iptables_hybrid fw drivers it works fine as we are explicitly adding proper SG rules for to allow DHCP requests from VM always.
  I think it's regression after https://review.opendev.org/c/openstack/neutron/+/733886 as we still have add_acl_dhcp() method but it's not used anywhere.

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