DHCPREQUEST/ DHCPNAK INIT−REBOOT broadcast
Boot before lease expires

INIT

Boot after lease expires

DHCPDISCOVER/ DHCPOFFER
broadcast

No response from server, lease expired

Has been offered an address

SELECTING DHCPACK
broadcast

REBINDING
At T2, begin broadcasting requests to all DHCP servers

DHCPREQUEST/ DHCPACK
client request broadcast

DHCPACK
unicast

DHCPREQUEST/ DHCPACK
broadcast server response

broadcast

DHCPREQUEST

BOUND
Has IP address

DHCPREQUEST
unicast

RENEWING
At T1, renew using unicasts