In OpenStack with Cisco ACI there is a default DNS for networks provided.
To define a different DNS go to Project | Network | Networks and click on the network:
Then, click on Edit Subnet
In the dialog, provide the prefered DNS, e.g.
126.96.36.199 as in the following screenshot. Then click Save
From now on all requests to DHCP will return the DNS specified.
Last modified: Nov. 7, 2017