The dhcpc unicast-flag enable command sets the Bootp flags field value in a DHCP request message to 0x0000 (Unicast).
The undo dhcpc unicast-flag enable command restores the default configuration.
By default, the Bootp flags field value in a DHCP request message is 0x8000 (Broadcast).
Usage Scenario
By default, DHCP request and response messages are broadcast ones. If the client requires the server to respond in unicast mode for security, run the dhcpc unicast-flag enable command to set the Bootp flags field value in a DHCP request message to 0x0000 (Unicast) before enabling the DHCP client function.