Comment 8 for bug 1976323

Functional job is green as seen in test patch https://review.opendev.org/c/openstack/neutron/+/843245

<< 3. 2 fullstack tests are failing:-

I checked the fullstack failures and found [1] which made the issue[2] appear in CentOS 9 Stream.
Ubuntu jammy didn't have the issue as it has the fixes(ping succeed but add warning DIFFERENT ADDRESS) available[3][4][5], i verified by using a build from fedora[6]

Version in CentOS 9-stream:- iputils-20210202-8.el9.x86_64
Version in Ubuntu jammy:- 3:20211215-1

Other observations which i am not sure if expected or not
neutron.tests.fullstack.test_local_ip.LocalIPTestCase.test_vm_is_accessible_by_local_ip(static_nat):- ping from vm1 to vm0, response comes from local_ip assigned to vm0
- after arp cache expiry of 30 seconds ping response works fine

neutron.tests.fullstack.test_l3_agent.TestLegacyL3Agent.test_north_south_traffic
ping from vm1 or qrouter namespace to external gateway(2001:db8:1234::), response comes from router interface

[1] https://github.com/iputils/iputils/commit/5e052ada96c3fc457efe66b2fed5c14ed8de6ae3
[2] https://github.com/iputils/iputils/issues/371
[3] https://github.com/iputils/iputils/commit/15a5e5c7aace5a7a782ff802988e04ed4c1148a5
[4] https://github.com/iputils/iputils/commit/5f6bec5ab57cc8beaa78f5756a0ffbdf01f28d36
[5] https://github.com/iputils/iputils/commit/dd0bcac98d10ea340dfe8aff43f26fe1a7f77931
[6] https://koji.fedoraproject.org/koji/buildinfo?buildID=1868148