[Bug 1905933] [NEW] Incorrect ARP processing when enable_distributed_floating_ip=True

[Frode Nordahl]

Public bug reported:

In a focal-ussuri deployment when enabling `enable-distributed-floating-
ip` traffic from instances with FIPs should exit the HV directly and not
go through a gateway chassis.

However due to a bug each HV will attempt to do ARP processing locally
even for IP addresses not in the external network CIDR.

This results in loss of connectivity for instances with FIPs.

The issue is not present in Groovy with OVN 20.06 and I suspect the issue is fixed by this commit:
https://github.com/ovn-org/ovn/commit/d9ed450713eda62af1bec5009694b2d206c9f435

** Affects: ovn (Ubuntu)
     Importance: Undecided
         Status: Fix Released

** Affects: ovn (Ubuntu Focal)
     Importance: High
     Assignee: Frode Nordahl (fnordahl)
         Status: In Progress

** Changed in: ovn (Ubuntu)
       Status: New => In Progress

** Changed in: ovn (Ubuntu)
       Status: In Progress => Fix Released

** Also affects: ovn (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Changed in: ovn (Ubuntu Focal)
       Status: New => In Progress

** Changed in: ovn (Ubuntu Focal)
   Importance: Undecided => High

** Changed in: ovn (Ubuntu Focal)
     Assignee: (unassigned) => Frode Nordahl (fnordahl)

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https://bugs.launchpad.net/bugs/1905933

Title:
  Incorrect ARP processing when enable_distributed_floating_ip=True

Status in ovn package in Ubuntu:
  Fix Released
Status in ovn source package in Focal:
  In Progress

Bug description:
  In a focal-ussuri deployment when enabling `enable-distributed-
  floating-ip` traffic from instances with FIPs should exit the HV
  directly and not go through a gateway chassis.

  However due to a bug each HV will attempt to do ARP processing locally
  even for IP addresses not in the external network CIDR.

  This results in loss of connectivity for instances with FIPs.

  The issue is not present in Groovy with OVN 20.06 and I suspect the issue is fixed by this commit:
  https://github.com/ovn-org/ovn/commit/d9ed450713eda62af1bec5009694b2d206c9f435

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