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VMXNET3 didn't help. I tried this without any Openstack packages - wiped the guest clean, reinstalled Ubuntu, created a bridge, namespace, and connected them with veth interface - still had the same issue. Coudn't reproduce this on ESXi 6.0, or VMware Workstation 12 though, but it's partially reproducing on another ESXi 5.1 host. It's seen only when promiscuos mode is enabled.
Anyway, this is not an Openstack issue, but some weird combination of VMware networking and linux bridging. Issue is not seen on a physical server(without hypervisor software), neutron node works perfecly fine there, so I'll stick with this option for now.
