Auto IP address
Auto IP address is activated if no DHCP or BootP server is found. This can take several minutes. The Auto IP address is formed as follows:
In the event of a timeout IP address 169.254.[MAC_05].[MAC06] is generated. If MAC_05 is 0 it is set to 1.
3 ARP probes are then sent. If no response is received a gratuitous ARP is sent and the IP is saved.
If the IP address already exists, the values for [MAC_05] and [MAC06] [MAC_04] are added up, and another attempt is made.