Applied Methodologies, Inc.
Technology Consultation and  Research

 

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Below are the pics of various Netstumbler sessions using the different antennas. No APs were associated or IP addresses                                                                              requested. Actually when using Linkferret with any of the antennas, the PC card's NDIS driver goes into a special promiscuous mode                                                                              so no IP connectivity is allowed. So, when using Linkferret I can "SNIFF" the air and see all the packets without associating or                                                                                 obtaining an IP address. The same applies when I hook any of the antennas to the WSP100 via an SMA pigtail,  since the                                                                                         WSP100/Neutrino is a completely passive receiving device I am not violating any laws. Also, when using a standard                                                                                                         Orinoco card in normal mode but turn IP off I can run any protocol analyzer software and sniff the channel I am on. In this case I                                                                                    can associate to the AP, but no IP info will been requested. Again these examples prove that at the minimum you should turn on WEP                                                                           and turn off SSID broadcasting.  One other thing noted is that some folks do turn off their APs during the day. Sometimes, depending                                                                             on the time of day I will see more APs than at other times. Still, the ones who had their APs turned off, when on, did not enable WEP.

So, in retrospect how does the saying go? "All your bandwidth belongs to us" or is it "All your APs belong to us"?

Please pardon the sizes of the pics and the scrolling.

In this shot I am using the 24dBi Mag grid with no amp and just rotating the antenna across the rooftops. Below is what I picked up.                                                                            I cut off the MAC address listing to protect the innocent and myself.

Here is a pic of the SNR of one of the APs. Notice the rise in signal over noise? This was achieved while rotating the antenna to find the                                                                   optimal SNR for that AP. Its like aiming a missile launcher, I love it!!!!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

In this pic I am using the same antenna but with the 1 watt AMP added to the RF circuit.. As you can see I picked up additional                                                                                  APs with the amp. I wonder how close some of those channel 6 APs are to one another to warrant any co-channel interference.                                                                                  Do these people see each other as well? At least one fella was smart to turn on WEP and close his system.

This pic is from the same stumble session as above but I selected one of the found APs. Noticed the increased signal as I rotate into                                                                             range but also notice the increased level of the noise floor from the amp as compared to the previous non amp pics highlighting the                                                                             same AP.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Now I will try the same tests as listed earlier but with the 15dBi Yagi. I basically get the same results using a different antenna.                                                                              However, the extra beamwidth did not pick up any additional APs, for now that is. At other times I was able to pick up additional                                                                              APs using the 15dBi Yagi due to its beamwidth.  I guess some folks turn off their APs when not in use. Not a bad practice.

Here is the SNR of one of the selected APs listed above using the Yagi.

Now I will try the Yagi with the 1 watt amp added to the circuit. Notice how I did not find as many AP this time around using the                                                                                      Yagi with the amp as apposed to the Mag grid directional. Maybe it was my "rotor" skills:))))

Here is the SNR of one of the APs that was highlighted here several times in the previous pic, but this time using the Yagi.                                                                                     Again, notice the noise floor and the increase in signal once I rotated the antenna for optimal range.

Hoped you enjoyed the show...