Vulnerability of Wireless LANs
Intrusion and Radio Interference



>>> WLAN Vulnerable to Intrusion


If you are using a WLAN between computers, or to wireless network router for Internet access and computer resource sharing, please take steps to guarantee your privacy, prevent theft of identify and theft of service.


>> Wireless routers allows anyone to connect ...


A typical "off-the-shelf" IEEE-802.11 wireless network system can have a radio frequency (RF) coverage range of several hundred feet. Using high-gain directional antennas, the interception range can be increased much further. This RF range is by design -- it is intended to allow reception within a typical house or building where users are co-located.


Without proper security enforcement, outsiders can compromise the network connection and have access to all data and resource on the network. In addition, someone could be intentionally, or even accidentally, using your Internet service by connecting to your wireless router. This theft of service is becoming more and more common, especially in dense urban areas. An outsider may be using your cable/DSL Internet service freely.


>> Wireless equipment is "made simple" to install ...


Often, consumers purchase WLAN equipment and install it without taking any security precautions. This is very common since the equipment will work right out of the box -- default settings allow any computer to automatically connect.


If you have WLAN equipment in use, we strongly recommend you review the product documentation and take steps to keep intruders out. Read the manuals that came with the wireless router, network interface card (NIC) and/or built-in wireless computer equipment. Your private information in the wrong hands can be damaging. If you require assistance, can help.


If you suspect a problem, can diagnose and correct it. We can also test your system to make sure it is performing to its fullest and hardened against malicious users attempting access.



>>> WLAN Vulnerable to Radio Interference


With the increasing number of wireless devices in use, radio frequency interference (RFI) is a growing concern. Many wireless devices are competing for a small section of allocated RF spectrum. These devices may also be physically close to each other -- increasing RFI problems even though they are operating on different channels.


>> Interference from phones and microwave ovens ...


If your network drops out often or performance is poor, this can be caused by other radio transmissions, including other neighboring WLANs, and devices such as microwave ovens and cordless phones. The potential for radio interference increases as more RF devices are used and when users are closer together.


RFI problems will cause WLAN dropouts to occur even though you have good signal strength from your wireless router. Source of interference can be difficult to detect. For example, cordless phones share the same RF spectrum and have more powerful signal strength than 802.11 WLANs. Even though different frequency channels are used, their power can drown out the WLAN channels that are several MHz away. Additionally, the phone base station sends status signals to the remote station at regular intervals, even though the phone is not in use.


Microwave ovens, though well shielded, radiate RF leakage power levels much greater than the 802.11 WLAN devices.


Always check the WLAN and other radio device product documentation for steps to avoid RFI problems.



>>> Provides Technical Support


Write us at, or call support triage at 703-527-7614 for more information, provide assistance with diagnosing problems and answer any questions you may have. We are professionals in this domain, and would enjoy talking to you.



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