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Communication Security: Wireless • Chapter 4 213
Figure 4.14 NetStumbler Main Screen
Notice the error message at the bottom of NetStumbler’s screen. If
this occurs, insert a wireless network card or, if your system has a wire-
less network card on the mini-PCI bus, make sure it has been enabled.
Once the wireless network card has been installed or enabled,
NetStumbler automatically begins picking up wireless network and
clients, as shown in Figure 4.15.
In this example, there are two APs in the area. Both are identified as
Cisco Aironet APs with WEP enabled. One AP is on channel 6 while the
other is on channel 1. The SSIDs are visible as 020020141 and stattest.
On the left side of the NetStumbler screen, it is possible to limit the dis-
play of the various wireless devices based on whether certain attributes
are on or off. For example, if you wish to only see APs that have WEP
turned off, select the “Encryption Off” filter. This is shown in Figure
4.16.
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