Wireless knowledge transfer appearance terribly economical and simple however comes up with immeasurable challenges over security. wrongdoer will simply sniff the information, miles away by victimisation powerful directional antennas. Our mistakes in past like flaws in WEP has shown USA that wireless security could be a typical challenge and should be taken seriously. Wireless Networking (Wi-Fi) has created it very easy for anyone to use net on your pc, mobile phones, tablets and different wireless devices anyplace within the house while not the litter of cables. With ancient wired networks, it's extraordinarily troublesome for somebody to steal your information measure however the large downside with wireless signals is that others will access the net victimisation your broadband association even whereas they're in an exceedingly neighboring building or sitting in an exceedingly automotive that’s pose outside your living accommodations. This apply, conjointly called piggybacking, is unhealthy for 3 reasons: • It can increase your monthly net bill particularly after you have to be compelled to pay per computer memory unit of knowledge transfer. • It can decrease your net access speed since you're currently sharing a similar net reference to different users. • It will produce a security hazard as others might hack your computers and access your personal files through your own wireless network. There are quite few instances wherever innocent net users are in remission for causing hate emails once actually, their email accounts were hacked tho' the unsecured Wi-Fi networks that that they had reception. Wireshark could be a free packet sniffing tool for Linux, waterproof and Windows which will scan traffic flowing through a wireless network together with cookies, forms and different communications protocol requests. Due to its convenience and low value, the utilization of wireless communication technologies will increase in domains on the far side the originally supposed usage areas, e.g. M2M communication in industrial applications. industrial applications typically have specific security necessities. Hence, it's necessary to grasp the characteristics of such applications and appraise the vulnerabilities bearing the very best risk during this context. AN analysis of those vulnerabilities and therefore the ensuing vulnerability catalogues in AN industrial context once considering LAN. The IEEE 802.11 LAN specification defines numerous frame sorts than LAN for wireless communications, in addition as managing and dominant wireless connections. the categories of frames within the IEEE 802.11 specification area unit management, control, and knowledge frames. Understanding the various IEEE 802.11 frame sorts is crucial for analyzing and troubleshooting the operation of WLANs. Denial-of-service (DoS) attacks against 802.11's waterproof protocol. Such attacks, that stop legitimate users from accessing the network, area unit a vexing downside all told networks, however they're significantly threatening within the wireless context. while not a physical infrastructure, AN wrongdoer is afforded appreciable flexibility when deciding wherever and once to attack, in addition as increased namelessness owing to the issue in locating the supply of individual wireless transmissions. Finally, as we are going to show, vulnerabilities within the 802.11 waterproof protocol permit AN wrongdoer to by selection or fully disrupt service to the network victimisation comparatively few packets and low power consumption. Facilities forever accompany flaws and wireless isn't any exception.