Question

Hello teltonika team,

i use the teltonika rut850_05 and i want to turn the wifi mode to "Monitor mode" for capturing probe request frame. Please can you help me to make this mode.

ps: right now i use the latest firmware https://wiki.teltonika.lt/view/RUT8xx_Firmware#RUT850_R_00.01.03_.7C_2019.02.13

below some screenshots of the router.

Answer 1

Hello,

To begin with, could you please let us know why do you need to capture "probe request frames"? In what usage scenario will router be used?

Comments

Hello,

thank you for the reply. We want to count the number of devices(without the devices be connected on the Access Point) in our office.And in the second time test this in public transportation for to know the number people who take the transportation everyday.

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Even though Teltonika router's hardware supports monitoring mode, their firmwares does not have built-in monitoring functionality.

Nonetheless, since Teltonika routers are OpenWRT based, you can download one of few OpenWRT packages (e.g. AirCrack), which would allow you to use monitoring mode.

However, please take note that in some countries such monitoring might be considered as illegal action (especially storing or manipulating monitored data). Consider consulting a lawyer before using such functionality in public environment.

Answer 2

Indeed i followed the instructions in this documentation https://openwrt.org/docs/guide-user/network/wifi/wireless-tool/aircrack-ng so the first obstacle is the reject of the installation of aircrack by this message : 

Installing aircrack-ng (1.2-rc1-1) to root...

Collected errors:

 * verify_pkg_installable: Only have 80kb available on filesystem /overlay, pkg aircrack-ng needs 364

 * opkg_install_cmd: Cannot install package aircrack-ng.

for this case it's a memory lack. Is it possible to extend the filesystem memory ?

Comments

Hi,

I am working on a project for a railway company and I find myself in the same situation as you.

Have you found a way to extend the filesystem? 

Have you been able to experiment with this solution in public transport?

Thank you in advance for your answers 

Answer 3

Hello @Raphael,

Have you found a way to extend the filesystem? 

No but there is another way by using the GPL(https://wiki.teltonika.lt/gpl/RUT850_R_GPL_00.01.03.2.tar.gz) you can delete some features you don't need to make the system's size less big. Add tcpdump from the GPL and launch the cross-compilation. 

Have you been able to experiment with this solution in public transport?

Yes we did it.

ps: for the use of tcpdump read this tutorial ==> https://frdmtoplay.com/counting-wireless-devices-on-a-raspberry-pi-with-tcpdump/