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I created similar environment with 2 compute node with OVS quantum. Among 2 nova-network communication is controlled by iptables. And your output don't have ICMP for each instance. So expected behaviour, each VM just communicate with same network. I changed security group setting to pass ICMP, each VM could communicate with other network.

However, I could duplicated your behaviour. So something wrong and have to investigate more.

Yes, adding more VM with correct tap, there is no problem. I asked why I had some problem with old tap/gw device had odd behaviour before.