April 2011
Intermediate to advanced
368 pages
11h 36m
English
Content preview from Secure Roaming in 802.11 Networks
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Roaming Securely in 802.11
walking away from AP1 until the signal strength drops too low, and we begin the Discovery
Delay. At this point, the STA associates with AP2. We see this Reassociation Delay in frames
203 to 215 in Figure 7.19.
Note the number of retransmitted frames (denoted by the letter “R” in the summary column) in
Figures 7.19, 7.20, and 7.21, where sniffer M3 has captured the wireless traffic between the
STA and the AP, which is the target of the roam. These retransmissions are likely due to a
busy wireless environment resulting in increased interference and collisions. When a careful
frame-by-frame analysis is performed, it is important ...
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