TCP/IP Tutorial and Technical Overview - IBM Redbooks

The DHCP client/server interaction steps are illustrated in Figure 3-45.
(1)
(3)
(5)
(6)
DHCP Clients Broadcast and Ask for IP Address DHCP Server
(DHCPDISCOVER)
Offering an IP Address
(DHCPOFFER)
Receive Offers
OK? NO? Use Previous Configuration
Select Process
Ask Selected IP Address
(DHCPREQUEST)
Verify (arp)
OK?
NO
YES
Client
Configured
Ack & Additional Configuration Information
(DHCPACK)
Decline an Offer (Very Rare)
(DHCPDECLINE)
Initiate the Entire Process Again
Figure 3-45 DHCP client and DHCP server interaction
(2) Servers
Verify
(4)
Relinquish Lease (DHCPRELEASE) Address Released
The following procedure describes the DHCP client/server interaction steps
illustrated in Figure 3-45:
1. The client broadcasts a DHCPDISCOVER message on its local physical
subnet. At this point, the client is in the INIT state. The DHCPDISCOVER
message might include some options such as network address suggestion or
lease duration.
2. Each server responds with a DHCPOFFER message that includes an
available network address (your IP address) and other configuration options.
The servers record the address as offered to the client to prevent the same
address being offered to other clients in the event of further
DHCPDISCOVER messages being received before the first client has
completed its configuration.
Chapter 3. Internetworking protocols 135