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This could be because of multiple issues:

  1. The VLAN range does not match the VLAN assigned to the VM.
  2. The security groups rules are filtering out all DHCP responses to the VM.
  3. If compute node and controller (where the DHCP server is running) are two separate machines, communication between them via the data link might be broken for whatever reasons.

To solve this, I suggest you run tcpdump on all interfaces from the VM to the physical port and see where the DHCP packet is being dropped. This should give us some clue on what could be the reason.

Also, please paste the contents of /etc/neutron/plugin.ini here. Would need to verify if the VLAN ranges are correct.