In the last few years there is tremendous development in the area of wireless and mobile network has been observed. Internet Engineering Task Force (IETF) proposed Mobile IPv6 to provide mobility in wireless networks. In MIPv6, Every time when Mobile node (MN) moves, it sends binding update message to the home agent (HA) for telling its current location. However, in this case there may be chances of spoofing of a Binding update (BU)message by an attacker and pretending to be another mobile node. And then the attacker redirects all the traffic destined for the original node to another node or to itself. This paper analyzes and also compares some of the existing mechanisms that are used for reducing threats related to binding update messages in the current mobile IPv6 environment and gives the overview of this area.