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From: purdy at (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 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.

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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