Open Stack

Hi, appreciate some advice on how instances in openstack get ip from
external DHCP server. For example instance is attached to port eth1
(physical port) and this port is connected to home/office lan port and
requests dhcp ip. How this can be achieved.
***User don't know the dhcp ip range/gw/dns that will be provided by the
dhcp sever to that instance...instance just attach to eth1 and request
ip.***
Similar like our pc/notebook request dhcp ip via wifi or lan port.
How to establish this in openstack. Please advise and help me.
Thank you
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