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On a business network, all sorts of proprietary data go back and forth Anything from e-mail to program source code to marketing plans or employee salary information may be available In such cases, it is not only advisable to implement a very tight access control and encryption plan for the wireless network, but you may want to go as far as setting a policy restricting what type of information people deal with when they are using a wireless connection Once someone has access to your network, he may be able to intervene in the traffic between clients and the network Intervention, or man-in-the-middle intrusions, are possible by a bad guy sitting in between a client and the wireless system, setting up a spoofing operation to make the client think it is connected to the wireless LAN and the wireless LAN to think it has a valid client out there The bad guy will pull out and store valid information and retransmit bogus information It sounds like Mission: Impossible tactics here, but this is quite possible, given enough equipment and skill
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Denial of service may be accidental or intentional simply denying clients the ability to connect to a wireless LAN through deliberate or incidental interference with wireless signals An appliance as benign as a wireless LAN-unfriendly 24 GHz cordless telephone can be a nuisance or a weapon, depending on who is using it and for what reason Those wanting to use their own wireless LAN will undoubtedly shelve their cordless phone once they determine it keeps them from using their wireless setup The little old lady across the street may have no clue or care that her cordless telephone is keeping you from enjoying wireless networking Someone intent on denying you the use of your wireless system will find some way to use one of these phones to keep you off the Internet A cordless phone is not the only weapon capable of denying you wireless network services A poorly shielded microwave oven, a legal amateur radio station, or government radio service can break your network in milliseconds To intentionally deny you service is certainly illegal and also requires that the bad guy knows you have a wireless LAN by using a tool like NetStumbler to see that you have active wireless gear
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Someone could intentionally or coincidentally create his own wireless network, overpowering yours, which could also deny you services Beware that you may also be denying someone, such as a legal amateur radio operator, legitimate use of his radio services by merely operating a wireless LAN, which presents significant apparent noise to amateur radio receivers Building and geographical obstructions may also deny you service These are less likely to be used to intentionally to deny you wireless services from a distant location, but are more coincidental or circumstantial It would seem that only a handful of very rich people would be able to command the construction of a new building just to block your signals No matter the source, if intentional, denial of service could be done to hurt your business by forcing you off-the-air or making your customers patronize a different caf perhaps even one they would have to pay to gain Internet access through I realize I may have just spawned a few less than ethical ideas by mentioning such techniques, but if they have not become obvious by now, then you are really not equipped to deal with the situation if it arises
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Detecting threats or problems along the wireless path is a twofold process differentiating between radio signal-related issues and data issues and the likely impact on service that each may have The first level of threat is someone finding out you have a wireless network by passively or actively monitoring the airwaves for 80211 activity Programs such as Ethereal, that puts a wireless interface into RFMON (receive only) mode or uses communications test equipment like a spectrum analyzer are completely passive and their use is undetectable Passive interception of the data along your wireless LAN traffic may go undetected There is no practical way to determine if some of the radio energy you are transmitting has been lost to another person s receiver, to a leaf on a tree, or to atmospheric conditions You will not lose data packets, but someone else will have been able to watch and catch them as they pass by
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