Many times we see tests failing with reporting "SSHException: No existing session". for example in https://jenkins-csb-cnvqe-main.dno.corp.redhat.com/job/test-pytest-cnv-4.20-network-ovn-dualstack/25/testReport/tests.network.flat_overlay.test_flat_overlay/.
What I suspect (but I am not sure) is that this is a side effect of the IP duplication issue that is addressed in https://issues.redhat.com/browse/CNV-71207.
The reasons I suspect that are
1 - Whenever I examined the failure a bit, I saw it happens on the flow of get_vmi_ip_v4_by_name
2 - On these failures, I also found that the flow involves assigning IPs from 10.200, which we already know is prune to collisions.
3 - This failure is flaky, it doesn't always happen.

I suggest that whoever takes this, will first try to understand whether it is indeed a side effect of the IP conflict, or rather and independent issue that requires dedicated ahdnling.