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One issue with corporate wireless networks in general, and WLANs in particular, involve the need for security. Many of the initial access path can not see whether or not a particular user has authorization to access the network. Although this problem reflects issues that have long troubled many types of cable networks this usually does not pose a significant problem, because many organizations that physical security is quite good. However, the fact that radio signals bleed outside of buildings and across property makes physical security largely irrelevant to Piggybackers. Corporate issues are covered in wireless security. Anyone within range of an open geographical network, wireless LAN security can ’sniff’ or capturing or recording of traffic, gain unauthorized access to internal network resources as well as the Internet, and then maybe send spam or perform illegal activities using the wireless network IP address, all rare for home routers, but may be significant concerns for office networks.

If router security is not enabled or if the owner off for convenience, create a free hotspot. Since most of the 21st century laptop PCs have wireless networking built in (cf. Intel Centrino technology ‘), they do not require third-party adapters such as PCMCIA card or USB dongle. Built in wireless network may be enabled by default, the unwitting owner, so the laptop is broadcasting accessibility to any computer nearby. Modern operating systems like Mac OS, or Microsoft Windows makes it fairly easy to make a PC as a Connection Sharing using a ‘base station wireless LAN Internet, enabling all PCs in the house to access the Internet via the’ base ‘PC. However, lack of knowledge about security issues in setting up such systems often means that someone nearby can also use the connection. Such “piggybacking” is usually achieved without knowledge of wireless network operators, perhaps even without disturbing the user’s knowledge if their computers automatically choose the wireless LAN security in nearby without collateral to be used as an access point.

There are three basic ways to secure wireless LAN security.

• For closed networks (like home users and organizations) are the most common way is to configure the access restrictions on the access point. Those restrictions may include encryption and checks on the MAC address. Another option is to disable ESSID broadcasting, making access difficult for outsiders to detect. Wireless Intrusion Prevention System can be used to provide wireless LAN security in the network model.
• For commercial providers, hotspots, and large organizations, the preferred solution often have an open and unencrypted, but completely isolated wireless network. The users will not initially have access to the Internet or local network resources. Commercial providers usually forwards all web traffic to a captive portal that provides for the payment and / or authorization. Another solution is to require users to connect securely to a special network using VPN.
• Wireless networks are less secure than cable, in many offices intruder can easily visit and connect their own computers to the wired network without problems, gain access to the network, and it is also often possible for a remote intruder to gain access to the network through backdoors like Back orifice. One common solution to end-to-end encryption, with an independent authentication on all of the resources should not be available to the public.

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