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The Ethernet modules support communications in the Ethernet II and 802.3 frame formats. (Ethernet II is the default.)
However, When communicating with a BOOTP or DHCP server, the Ethernet modules that communicate with DHCP servers make requests in this order:
.. first: 4 requests in the DHCP format defined by RFC 2132
.. second: 4 requests in the DHCP format defined by RFC 1533
To avoid flooding the server with simultaneous requests, the transmission time of each request is base on the backoff algorithms defined by the respective BOOTP and DHCP RFCs.