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The most common cause of intermittent connectivity is a toss-up between interference and weak signals If weak signals are the problem, try moving the client closer to the AP If the problem is resolved, higher-gain antennas may provide a permanent solution You can install the higher-gain antennas either at the AP (if this action does
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INSIDE THE EXAM
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Certainly, the most common complaint about wireless networks (after security) is related to connectivity Intermittent connectivity problems are some of the hardest to analyze The user may lose her connection three or four times in a five-minute window and then call you for help in frustration The problem is that, when you arrive, the connection is stable If we re not careful, it s easy to write off the situation as user error; however, it is more likely that an intermittent interference source is the problem If the connectivity problem has been occurring for some time, suspect a device permanently in the environment If the problem just started, an attack against your network could be under way In both situations, you can use a spectrum analyzer (as referenced in 6) to locate the interference Many devices cause interference, but the interference they cause may not be problematic to devices that are closer to the AP An example of this is a microwave oven Many microwaves operate (roughly) in the range from channels 5 to 11 of the 80211 standard within the 24 GHz ISM band The microwave is not designed to work in those channels; the channels just happen to use the frequency range that is best absorbed by water If a microwave is near a client and that client is far from the AP, the microwave may all but drown out the signals from the AP Some older microwave ovens will operate in the entire 24 GHz spectrum and not just the higher channels
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not cause problems for the rest of the network) or at the client Since many clients do not support external antennas, you may have to upgrade the AP antenna or replace the client wireless NIC entirely
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Weak signal strength can be identified using the client tools in the computer or free applications like NetStumbler Any time users complain of poor performance on the WLAN, check the signal strength In an environment that is noisy (understood as RF noise), more signal strength will be needed to maintain higher data rates You may be able to adjust the output power in the AP in order to resolve signal strength issues At other times, using high-gain antennas may be helpful
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7:
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Installing and Troubleshooting a Wireless LAN
EXERCISE 7-1 Using NetStumbler
ON THE CD CertCam
In this exercise we are going to use NetStumbler to monitor signal strength during mobility You will want to start the exercise in a location within a few feet of the AP
Launching and Configuring NetStumbler
1 Launch the NetStumbler application from the Start menu or the Desktop icon of a laptop computer that is powered by battery 2 Click the Device menu and select the appropriate NIC 3 On the File menu, ensure that Enable Scan is checked
Viewing WLANs
1 In the left pane, expand the Channels node in order to view the detected active WLAN channels 2 Expand a channel to view networks and click a network to view the signal strength graph 3 Move approximately 20 feet away from the AP Note the new signal strength 4 Move approximately 40 to 50 feet away from the AP Note the new signal strength 5 Finally, move approximately 100 feet away from the AP Do you still have a connection In some cases, you may completely lose the connection at only 100 feet This is particularly true when there are several walls between you and the AP
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