Open Stack

Hi all,

I set up an openstack recently. My first tenant's VMs' floating IP work fine. All of them is pingable from "Internet".
However on second tenant, via GUI or CLI I can successfully assign floating IPs to VMs, but they are not pingable. Meanwhile, I can ping Internet from VM's private network(IP).
My environment: Grizzly. Quantum. 3 physical servers. One is controller; one is network; and the other is compute node. GRE tunnel.
Anyone has idea? Thanks for your help.

Leon
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