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L2 broadcast in GRE tunneled setup

In normal openstack setup, where VM's are configured to use GRE tunnels, is it possible to send the L2 broadcast to an L2 Device.

My scenario is something like this. I want to setup 5 VMs and then intercept traffic on L2 using a hardware device that only listens to Layer2 packets, no ip setup is possible. I have followed a usual setup guide which only configures the Neutron network using GRE tunnels. I have no idea if is possible to share L2 domain with an external device.

Any help.