Even if you take every possible step to keep out wireless intruders ( e.g.. Hiding SSID, Limiting the number of ip address, filtering MAC address, Encryption ) , someone can still slip into your network. You can use several methods to regularly check your network.
For example, a free program called Airsnare keeps weather eye out for wireless intruders. If it finds any, it notifies you, shows you their activity, and even sends the intruder an alert..
Before you can use Airsnare, you must download and install a library of tools the program needs. Get the wincap library from http://wincap.polito.it/install/default.html
Download and install Airsnare.
http://home.comcast.net/~jay.deboer/airsnare
After you install the program , goto c:\program files\Airsnare. Open trustedMAC.txt , and add the MAC addresses of all the network adapters on your network. Enter the MAC address on a new line follow it by a space, and then type in a description of the computer.
Go to C:\program files \ Airsnare and run Airsnare.exe
Choose your network adapter.
Whenever an unwelcome devices slips onto your wireless network, Airsnare will alert you. You can monitor the activity, including the sites they visit. You can even log their activity to a file and send them personalized alerts.
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