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I agree with Dan that SNAT appears to be occuring when a packet is sent from server B. It also seems that SNAT is not occuring from server A to server B (I would have expected the 9.9.8.0 to receive pkt with altered src IP as the 9.9.9.0 gateway)

iptables rules would be extremely interesting. Understanding whether 9.2.156.126 belongs to the nova's network node (as public IP) or is just the IP address associated with eth1 could also be helpful.

You might provide also (if possible) - output from ovs-dpctl dump-flows br-int on both servers (I typically run it in a rather rude form: watch --interval=0.5 "date >> output.txt; ovs-dpctl dump-flows br-int >> output.txt"). This will let us understand where packets sents from server B are forwarded and vice-versa.

You can use paste.openstack.org for pasting large chunks of text.

Salvatore