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Openstack for every network device (router, dhcp agent) creates and net namespace, so as correct you find the ip netns returns the net namespaces, so with ip netns exec you can run commands that not know what net namespace mean, or you can use other utilities that can bind directly to linux net namespaces. I preface to run :

ip netns exec <net namespace> bash

and then i start to work in the enviroment as o was without net namespaces.