A methodology has been proposed to extend the desirers of people with large covered WLAN with the help of IAPP protocol and self designed antennas. The IAPP is a communication protocol used by the management entity of an AP to communicate with other APs and which will provide a unified solution for both intra and intersubnet handoff processes. The proposed enhancement relies on the access point's interoperability with other APs, provided by the IP-based IAPP, so as to enable the intra and intersubnet link-layer frame buffering-and-forwarding. IAPP is an IEEE 802.11f standard which is a part of IEEE 802.11 is designed for the enforcement of unique association throughout an ESS and for secure exchange of stations security context between current AP and new AP during the handoff period. It is simulated with self-designed IAPP software which is portable to different operating systems and wireless chipsets using well-defined external interface. The performance of IAPP measured, compared and explained with the help of graphical representations.