debug ip dhcp server packet

debug dhcp detail

access-list 100 permit ip host 0.0.0.0 host 255.255.255.255

In exec mode, enter the following debug command:

debug ip packet detail 100

Ref: Cisco DHCP Debug

In privileged (Enable) mode and enter the command

terminal monitor

no debug all
conf t
logging monitor debugging
logging on
exit

Enter your Debug command for example:  debug ip dhcp server packet

Turn it off after debugging

no debug all
terminal no monitor
conf t
no logging monitor
exit