User's Manual

UTT Technologies Chapter 7 Advanced Setup
http://www.uttglobal.com Page 155
DHCPDECLINE
Message from a client to server indicating that the offered address is already in
use.
DHCPACK
Acknowledgement message from a server to a client with configuration
parameters, including IP address.
DHCPNAK
Negative acknowledgement message from a server to a client, refusing the
request for parameters. If the client receives a DHCPNAK message, it will
restart the configuration process.
DHCPRELEASE
Message from a client to a server cancelling remainder of a lease and
relinquishing network address.
DHCPINFORM
Message from a client that already has an IP address (manually configured, for
example), requesting further network configuration parameters (DNS server¶s
IP address, for example) from the DHCP server. This message is used very
rare.
Table 7-2 DHCP Message Types
7.8.2 Introduction to DHCP Feature of the Device
According to the different settings, the Device can act as a DHCP client, DHCP server or
DHCP relay agent. The following sections describe their characteristics respectively.
Note
If the DHCP client is enabled on a physical interface, neither the DHCP server nor
DHCP relay agent function can be enabled on it. If both the DHCP server and DHCP
relay agent function are enabled on the interface, the DHCP server has higher priority.
That is, the Device will chose the DHCP server to process the DHCP messages
preferentially; and it will chose the DHCP relay agent to process the messages only
when the DHCP server isn¶t able to process them.