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As i can see in this Guide use Provider Network configuration. So in the one VM example use the net you create on provider vlan 223. So your vm's work because both belongs to vlan 223. Normally you cannot communicate with vm's with this configuration, except if you attach some device to vlan 223 and gives it a valid ip (not included to allocation poll of sub-net you created before). I cannot understand why you must ping from Controller the instances? If you access the vms outside of the virtual network, you must enable floating ip address, but this need L3 routing module.

As i can see in this Guide use used Provider Network configuration. So in the one VM example use the net you create on provider vlan 223. So your Your vm's work because both belongs to vlan 223. Normally you cannot communicate with vm's with this configuration, except if you attach some device to vlan 223 and gives it a valid ip (not included to allocation poll of sub-net you created before). I cannot understand why you must ping from Controller the instances? If you need to access the vms outside of the virtual network, you must enable floating ip address, but this need L3 routing module.