BAD address / this address is already in use

Source:http://www.networksteve.com/forum/topic.php/BAD_address_/_this_address_is_already_in_use/?TopicId=17460&Posts=1

Hi
i am having windows 2003 DHCP server
Now clients are not getting IP .
When i opened  DHCP Console ..its showing bad address along with this address is already in use..

 

After the DHCP client receives a lease from the DHCP server, the client sends an Address Resolution Protocol (ARP) request to the address that it has been assigned. If a reply
to the ARP request is received, the client has detected a conflict and sends a DHCPDecline message to the DHCP server. The DHCP server attaches a BAD_ADDRESS value to the IP address in the scope for the length of the lease. The client then begins the lease
process again, and is offered the next available address in the scope.
Likely an overlapping scope on another DHCP server (maybe authorised or rogue) or a PC with static IP that conflicts. This web page describes how to enable server conflict detection
to help. If you have Dynamic DNS or WINS you can check those for reverse registrations of the IP. Also nbtstat -a <IP address> to chase it down. Once you find the conflicting machine, check IPCONFIG /ALL to track down the DHCP server if it's a DHCP client
and not statically assigned. Some network monitoring for DHCP traffic will also track it down too