[Bug 1916761] Re: [dvr] bound port permanent arp entries never deleted

[Łukasz Zemczak]

Hello Edward, or anyone else affected,

Accepted neutron into focal-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/neutron/2:16.3.0-0ubuntu3 in a few
hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
focal to verification-done-focal. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-focal. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: neutron (Ubuntu Focal)
       Status: Triaged => Fix Committed

** Tags added: verification-needed-focal

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https://bugs.launchpad.net/bugs/1916761

Title:
  [dvr] bound port permanent arp entries never deleted

Status in Ubuntu Cloud Archive:
  Fix Committed
Status in Ubuntu Cloud Archive train series:
  Triaged
Status in Ubuntu Cloud Archive ussuri series:
  Triaged
Status in Ubuntu Cloud Archive victoria series:
  Fix Committed
Status in neutron:
  In Progress
Status in neutron package in Ubuntu:
  Fix Released
Status in neutron source package in Focal:
  Fix Committed
Status in neutron source package in Groovy:
  Fix Committed
Status in neutron source package in Hirsute:
  Fix Released

Bug description:
  [Impact] [Test Case]
  With Openstack Ussuri using dvr-snat I do the following:

    * create port P1 with address A1 and create vm on node C1 with this port
    * associate floating ip with P1 and ping it
    * observe REACHABLE arp entry for A1 in qrouter arp cache
    * so far so good
    * restart the neutron-l3-agent
    * observe REACHABLE arp entry for A1 is now PERMANENT
    * delete vm and port
    * create port P2 with address A1 and create vm on node C1 with this port
    * vm is unreachable since arp cache contains PERMANENT entry for old port P1 mac/ip combo

  If I don't restart the l3-agent, once I have deleted the port it's arp
  entry does REACHABLE -> STALE and will either be replaced or timeout
  as expected but once it is set to PERMANENT it will never disappear
  which means any future use of that ip address (by a port with a
  different mac) will not work until that entry is manually deleted.

  [Where problems could occur]

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