In order to reduce the cost and commoditize wireless cards, IEEE 802.11 WLAN card vendors [1,3] are minimizing the functionality of the code residing in the microcontroller of their cards. These next generation of wireless cards, which we refer to as Native WiFi cards, implement just the basic time-critical MAC functions, while leaving their control and configuration to the operating system. More importantly, these cards allow the operating system to maintain state and do not undergo a firmware reset on changing the mode of the wireless card. This is in contrast to the existing cards, which we refer to as legacy wireless cards in the rest of this paper.