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To reach instances from outside their private network, you need to assing floating IPs to them.

In addition, to reach the instances from outside the Devstack server, the public network must be mapped to the network that the Devstack server is attached to (192.168.0.0/24 in your case), as you correctly assumed. See https://docs.openstack.org/devstack/latest/networking.html#locally-accessible-guests to achieve that.