def _create_veth_pair(self, dev1_name, dev2_name): """Create a pair of veth devices with the specified names, deleting any previous devices with those names. """ LOG.debug("Create veth pair, port1:%(qvb)s, port2:%(qvo)s", {'qvb': dev1_name, 'qvo': dev2_name}) for dev in [dev1_name, dev2_name]: self._delete_net_dev(dev) host_network.ip_link_add_veth_pair(self._session, dev1_name, dev2_name) for dev in [dev1_name, dev2_name]: host_network.ip_link_set_dev(self._session, dev, 'up') host_network.ip_link_set_promisc(self._session, dev, 'on')