DHCPDiscover Message
DHCP client sends a DHCP Discover broadcast on the network for finding a DHCP server. If there is no respond from a DHCP server, the client assigns itself an Automatic Private IPv4 address (APIPA).
DHCPOffer Message
DHCP servers on a network that receive a DHCP Discover message respond with a DHCP Offer message, which offers the client an IPv4 address lease.
DHCPRequest Message
Clients accept the first offer received by broadcasting a DHCP Request message for the offered IPv4 address.
DHCPAcknowledgment Message
The server accepts the request by sending the client a DHCP Acknowledgment message.
DHCPNak Message
If the IPv4 address requested by the DHCP client cannot be used (another device may be using this IPv4 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 IPv4 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.
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