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An instance can reach metadata via:

  • http://169.254.169.254
  • config-drive (iso9660 iso attached to instance)

An instance will reach 169.254.169.254 via:

  • default route (pointing to Neutron router)
  • static route (pointing to Neutron DHCP namespace)

As long as your org's DHCP server is sending a default route pointing to the Neutron router, I would think you'd be good. Otherwise, you may be limited to using config-drive instead, since it doesn't rely on DHCP.

You can also add DHCP options to Neutron ports that you attach to instances if you'd rather Neutron handled the entire stack rather than using org's DHCP server.