RE: [inbox] Re: Cisco LEAP exploit tool...

["Curt Purdy" <purdy () tecman com>]

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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