The LLTD Responder in Microsoft Windows Vista does not send the Mapper a response to a DISCOVERY packet if another host has sent a spoofed response first, which allows remote attackers to spoof arbitrary hosts via a network-based race condition, aka the "Total Spoof" attack.
http://www.symantec.com/avcenter/reference/Vista_Network_Attack_Surface_RTM.pdf
http://www.securityfocus.com/bid/23263
http://www.securityfocus.com/archive/1/464617/100/0/threaded
http://www.securityfocus.com/archive/1/462793/100/0/threaded