lutful
Premium
join:2005-06-16
Ottawa, ON | reply to LLigetfa
Re: PtP vs. PtMP and max EIRP
It is best to use methods that facilitate fair usage of the spectrum by both parties. They are also effective against DoS attacks.  |
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LLigetfa
join:2006-05-15
Fort Frances, ON
| reply to lutful
said by lutful  :LLigetfa, Industry Canada spectrum group do not expect irrefutable proof but they will also not act on mere suspicion. Only once in my life, back in my teenage years dabbling with MATV, amateur, and CB radio did I ever lodge a complaint with what was then DOC (department of communications). It was over a leaking Ontario Hydro insulator and they drove out 60 miles to investigate it.
I have no intention of performing any sort of DoS against other WISPs regardless how uncooperative they are. In fact, I have no proof of any illegal EIRP, only the hearsay of others that might possibly be trying to get me off their scent. All I know is if I plug in some of the tower coords and specs into RM, some links report as not viable and if I ask for details, I get nothing.
For all I know they could be real nice folks lurking here on this board.  |
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lutful
Premium
join:2005-06-16
Ottawa, ON
 ·TekSavvy Solutions..
1 edit | reply to LLigetfa
LLigetfa, Industry Canada spectrum group do not expect irrefutable proof but they will also not act on mere suspicion.
They will accept even NetStumbler data if it is collected in a careful and methodical way and reasonably supports the illegal EIRP hypothesis. IC will do the rest with their fabulous CRC gizmos.
cmaenginsb, the "802.11 smarts" method to counter such WISPs can also be abused by hackers, so it is best not to discuss the details in public. They exploit standard 802.11 and various 802.11-derived MAC protocols and also the clear channel assessment (CCA) mechanisms in various 802.11 PHYs.
Such methods can be extended to "non-802.11 chipset" radios operating in 900Mhz and 5.8Ghz bands but only a few popular brand of equipment has been fully analyzed thus far. |
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LLigetfa
join:2006-05-15
Fort Frances, ON
| reply to lutful
said by lutful :I think you suggested WiSpy placed at the focus of a dish? That will work very well from a distance to capture raw data. Three problems with that.
1. It is an uncalibrated piece of test equipment and gives unsubstantiated results. Yes, one could personally calibrate it against some known source but still not something you could take to the authorities as irrefutable.
2. It only does the 2.4GHz spectrum. The 5 gig and 900 meg spectrum is not covered.
3. You need to be within the beam of the PtP links some of which are as much as 200 feet high on towers.
It would give some useful info for general 2.4 spectrum use though and a general EIRP on PtMP setups. |
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lutful
Premium
join:2005-06-16
Ottawa, ON
·TekSavvy Solutions..
| reply to LLigetfa
It is possible to counter such WISPs with "802.11 smarts" that are perfectly legal, we can discuss details privately.
First you need to create a comprehensive profile of their AP sites and EIRP.
I think you suggested WiSpy placed at the focus of a dish? That will work very well from a distance to capture raw data.
If you take multiple readings at different distances from their APs, you can deduce the exact EIRP and channel usage. |
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