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Message-ID: <003601c42309$18285230$9800a8c0@LUFKIN.DPSOL.COM> From: purdy at tecman.com (Curt Purdy) Subject: [inbox] Re: Cisco LEAP exploit tool... Amaury Jacquot wrote: > > To get a 2.4 Ghz signal to travel 7 miles you would have to > install an > > amplifier to boost the output to somewhere between 5 to 10 > watts > > not exactly > in fact, you don't need amplifiers in most cases. > you don't even need 1 watt > in fact, the trick lies in the antenna you attach to the > active end of > the communication devices. > for instance, we were able to do a 15km link at 11mbit/s with 2 15dBi > antennas from hyperlinktech.com. that's much more than 7 miles (it's > about 10 miles). > with 21dB antennas, we calculated that we'd be able to do > 30km, or 20 miles. This scenario requires point-to-point directional high db parabolic antennae. The original sceanario of the thread was reading packets from an AP inside a building. It would not have even a tower-mounted high db omni-directional, but even if it did, would have a maximum range of 2-3 miles under legal power limits. Curt Purdy CISSP, GSEC, MCSE+I, CNE, CCDA Information Security Engineer DP Solutions ---------------------------------------- If you spend more on coffee than on IT security, you will be hacked. What's more, you deserve to be hacked. -- White House cybersecurity adviser Richard Clarke
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