Installing and Administering Internet Services

Chapter 6 257
Dynamic Host Configuration Protocol (DHCP)
DHCP Components and Concepts
Figure 6-1 DHCP Client and Server Transaction
DHCP Client
DHCP Server
DHCP Client
DHCP Server
STEP 1: Client sends
STEP 2: Server receives
and offers available IP address
DHCPDISCOVER packet
to client by sending DHCPOFFER
DHCPDISCOVER
STEP 3: Client receives DHCPOFFER
and sends DHCPREQUEST requesting
the IP address lease offered
STEP 4: Server receives
DHCPREQUEST and grants
IP address lease officially by
sending DHCPACK
DHCP Client
STEP 5: Client requests
extension on lease
before it expires.
broadcast packet
DHCP Server
DHCP Client
STEP 6: Server sends ACK to client granting an
extension on the IP address lease.