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You gotta make sure your router has a port in the same subnet as your VM. Take a look at the Network Topology view in your OpenStack Dashboard. If there's no link from the external network via your router to the subnet with your VM you can add a port by going to "Routers", selecting the appropriate router and then clicking 'Add Interface'. Afterwards you should be able to assign a floating IP from the 2nd external network.

All this said, this only (seemed to?) worked for me for a short time. We just teared down all the virtual networks in our testbed b/c not a single VM was able to get further than the routers external IP.

Also see the bug "Multiple Floating IP Pools feature is broken" on Launchpad: https://bugs.launchpad.net/neutron/+bug/1191729