  The objective of this paper is to investigate a special Denial of Service
(DoS) attack against 802.11 wireless networks. This attack is known as the
Deauthentication / Disassociation attack which is launched against 802.11-based
wireless networks. When a client needs to disconnect from the wireless access
point, it sends special frames known as deauthentication or disassociation
frames. Due to being encrypted, these frames do not require an authenticated
user. Hence, an attacker can craft these frames and send them to the access
point in such a way that the access point assumes the frames to be coming from
the client and not the attacker. In this paper, an efficient solution is
proposed to prevent deauthentication attack by using a session management
system used to then verify deauthentication frames.
