In appears that the USRP-1 is limited in two dimensions, one of which
would be required for a full sniffer:
First, the USB link does not support for a whole band to be transfered
to the PC in raw form. Second, the FPGA seems too small to support
decoding of the channels before sending to the PC. I'd be happy to be
proven wrong on the latter one by some ingenious FPGA programmer.
The current tool of choice, USRP-2, has a faster link (GbE) and a
larger FPGA. I second your call for cheaper hardware as two USRP-2s
are too expensive for most researchers. I assume the right order of
doing things is: 1. Implement a sniffer on the most available
hardware to understand its requirements; then 2. construct a fit-for-
purpose hardware with just enough resources. I'd be surprised if we
found a scaled-down radio peripheral that already matches our needs.
The SSRP for example seems to share the bottlenecks of the USRP-1.
Cheers,
-Karsten
On Jan 3, 2010, at 11:25 AM, Clemens Gruber wrote:
> Yes for either .., or.. but if we want to capture both up- and
> downlink
> at the same time, there has to be a setup of 2 USRP2s, am I wrong?
> With the USRP1 it should, due to the 2 RX slots, be possible to
> capture
> both directions..
> I would really appreciate a cheaper variant like the one called SSRP..
> students as I am, do not have much money.. (and there are many of us
> out
> there who would like to join the active development but cannot afford
> the hardware)
>
> On Sun, 2010-01-03 at 11:04 +0100, Karsten Nohl wrote:
>> P.S. As a technical note: I believe a USRP-2 can captured a whole GSM
>> allocation in either the upink or downlink direction.
>>
>>
>> On Jan 3, 2010, at 10:35 AM, Gregory Maxwell wrote:
>>
>>> On Sun, Jan 3, 2010 at 4:23 AM, Fabio Pietrosanti (naif)
>>> <[email protected]> wrote:
>>>> This thread is making me understanding that there's not enough
>>>> information.
>>>> I read on airprobe website:
>>>> https://svn.berlin.ccc.de/projects/airprobe/wiki/hardware
>>>> But i read here that 1 USRP2 along with 2 daughterboards are
>>>> required.
>>>> Can we confirm that the equipment needed is 2 DBSRX daughterboards
>>>> along
>>>> with antennas?
>>>
>>> You're spouting nonsense: USRP2 is a single daughterboard beast. The
>>> page you're linking to only mentions USRP2 in passing.
>>>
>>> If these details are causing you confusion for you then you need
>>> to do
>>> more background reading to understand the underlying technology.
>>> There are plenty of details out there, including information on the
>>> limitations of the USRP1 bandpass in dealing with externally
>>> controlled channel allocation.
>>>
>>> These tools are not (currently) suitable for casual use, you need to
>>> invest a considerable amount of effort into learning the technology.
>>> Because a point-and-click tool will never be possible (due to the
>>> required hardware) it isn't at all clear to me that it would be
>>> worthwhile for anyone to invest time into making it too much easier.
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