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Network problems after compute node reboot

We rebooted a compute node while running an instance on it. After the reboot the network of this instance did not work. I could not ping the internal address nor the floating IP. Rebooting, Hard resetting... nothing helped. I had to recreate the instance based on the volume. Then it worked again.

What could been the problem?

It is Queens running on Ubuntu 16.04 with networking done by Neutron.