May 27, 2015 · If DHCP options 60 and 43 are not present, the ADP protocol will send two UDP discovery frames (1 broadcast and 1 multicast) every 0.5s for 5 seconds. If no response from any controller is received, the AP will initiate a DNS lookup for aruba-master.domain (default), where 'domain' is the domain received via dhcp.
The DHCP server assumes that the address was assigned by another DHCP server on the same segment if it's not from its own pool. If the address fails the subnet mask/IP address check, the DHCP server checks to see if it came from a Superscope, if one is defined. If not, the server responds to the DHCPRequest with a NACK packet.