[Bug 1943266] Re: Duplicated ARP responses from ovnmetadata namespaces

[Launchpad Bug Tracker]

This bug was fixed in the package ovn - 20.12.0-0ubuntu3

---------------
ovn (20.12.0-0ubuntu3) hirsute; urgency=medium

  * Add RBAC rules for IGMP_Group table (LP: #1914988):
    - d/p/lp-1914988-Add-IGMP_Group-to-ovn-controller-RBAC.patch
    - d/p/lp-1914988-northd-Add-missing-RBAC-rules-for-FDB-table.patch
    - d/p/lp-1914988-northd-Amend-Chassis-RBAC-rules.patch
    - d/p/lp-1914988-northd-Add-Controller_Event-RBAC-rules.patch
    - d/p/lp-1914988-tests-Amend-release-stale-port-binding-test-for-RBAC.patch
    - d/p/lp-1914988-tests-Use-ovn_start-in-tests-ovn-controller.at.patch
    - d/p/lp-1914988-tests-Make-certificate-generation-extendable.patch
    - d/p/lp-1914988-tests-Test-with-SSL-and-RBAC-for-controller-by-defau.patch
  * d/p/lp-1943266-physical-do-not-forward-traffic-from-localport-to-a-.patch:
    Do not forward traffic from localport to localnet ports (LP: #1943266).
  * d/p/lp-1913024-northd-Add-Chassis_Private-external_ids-column-to-RB.patch
    Update RBAC rules for Chassis_Private table (LP: #1913024).
  * d/p/lp-1917475-northd-Amend-RBAC-rules-for-Port_Binding-table.patch
    Update RBAC rules for Port_Binding table (LP: #1917475).

 -- Frode Nordahl <frode.nordahl at canonical.com>  Fri, 01 Oct 2021
09:42:00 +0200

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https://bugs.launchpad.net/bugs/1943266

Title:
  Duplicated ARP responses from ovnmetadata namespaces

Status in ovn package in Ubuntu:
  Fix Released
Status in ovn source package in Focal:
  Fix Released
Status in ovn source package in Hirsute:
  Fix Released
Status in ovn source package in Impish:
  Fix Released

Bug description:
  When OpenStack instances are connected to an external network, an ovn-etadata-namespace is created in each compute that has VMs attached to that
  network. Because the ovn-metadata namespace has interfaces with the same mac address in all computers, external switches might ARP query for the IP
   and receive multiple responses in different ports triggering network error alerts.

  [ubuntu at sombrafam-bastion(kvm):~/internal_git/stsstack-bundles/openstack]$ sudo arping -c 1 10.5.150.0
  ARPING 10.5.150.0
  42 bytes from fa:16:3e:d3:10:01 (10.5.150.0): index=0 time=1.678 msec
  42 bytes from fa:16:3e:d3:10:01 (10.5.150.0): index=1 time=2.143 msec

  --- 10.5.150.0 statistics ---
  1 packets transmitted, 2 packets received,   0% unanswered (1 extra)
  rtt min/avg/max/std-dev = 1.678/1.911/2.143/0.232 ms


  Reproducer: https://paste.ubuntu.com/p/nbnhvTM9d4/

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