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The devices that appear and then are removed in #11 are created and destroyed by Nova when VMs are booted and destroyed. Are you saying that those specific devices (e.g., vnet0) where destroyed without deleting the VMs? That would be very surprising.

The other devices (e.g., tapXXX and qrYYY or qgwZZZZ) are not supposed to be in the main namespace if use_namespaces=True

what do you see when you run "ip netns list" ? And then for each namespace name you see, run:

ip netns exec <namespace-name> ip addr