DHCPDiscover Message
DHCP client sends a DHCP Discover broadcast on the network for finding a DHCP server
DHCPOffer Message
DHCP servers on a network that receive a DHCP Discover message respond with a DHCP Offer message, which offers the client an IP address lease
DHCPRequest Message
Clients accept the first offer received by broadcasting a DHCP Request message for the offered IP address
DHCPAcknowledgment Message
The server accepts the request by sending the client a DHCP Acknowledgment message
DHCPNak Message
If the IP address requested by the DHCP client cannot be used (another device may be using this IP address), the DHCP server responds with a DHCPNak (Negative Acknowledgment) packet. After this, the client must begin the DHCP lease process again
DHCPDecline Message
If the DHCP client determines the offered TCP/IP configuration parameters are invalid, it sends a DHCPDecline packet to the server. After this, the client must begin the DHCP lease process again
DHCPRelease Message
A DHCP client sends a DHCPRelease packet to the server to release the IP address and cancel any remaining lease
DHCPInform Message
DHCPInform is a new DHCP message type, defined in RFC 2131. DHCPInform is used by DHCP clients to obtain DHCP options : DNS server IP addresses, WINS server IP addresses, and a DNS domain name