Re: [Discuss-gnuradio] SSH using gr-ieee 802.11 transceiver : (the youtube demo)

[sumit kumar]

On 12 July 2017 at 07:51, Bastian Bloessl <address@hidden> wrote:

Hi,

On 07/12/2017 01:37 AM, sumit kumar wrote:

Hello,

I was trying to understand gr-ieee 802.11 wifi_transceiver.grc
I see the youtube video
https://www.youtube.com/watch?v=tAVgsJLM-sc

I believe a single gr-ieee 802.11 wifi_transceiver.grc is running on a laptop with usrp and communicating with a WiFi card (ath5k driver) of another laptop
<*I hope my understanding is correct*>

Yes, that's right.

I visited the git page and it looks to me like "*Ad Hoc Network with WiFi card*" as the author has mentioned >
How do I replicate this experiment. If someone has replicated the stuff shown in video, pl let me know :)

The configuration that I used for the GNU Radio transceiver can be found in the apps/nic.sh script.

It's not totally trivial to setup, you should have a rough idea about networking, MAC addresses, and ARP. Because on the other laptop you have to open an ad hoc network, add corresponding static ARP entries for the MAC configured for the GNU Radio transceiver, and set an IP in the same subnet as the GNU Radio transceivers TUN/TAP interface.

Hi,

Actually I am trying the same set-up :) However I face some issues. Such as , when I configure my TP Link dongle (ath9k) in ad-hoc mode, it switches to 802.11b, instead of 802.11g. Could you suggest any such dongle where I can force change the modulation method.

Regarding, ARP entries, I had the idea (couldn't  go ahead becz dongle switch to 802.11b) : First establish adhoc connection between two dongles(so that ARP tables are updated). Then copy mac address of one dongle(say dongle A) to the transmitter of my openairinterface wifi transceiver, then power off the dongle A and turn on my own cloned transceiver.

However I was trying to send ACK for the pings generated from dongle B (the other dongle) before the layer 2 trails are exhausted. I am trying all this inside a RF cage.

How do you manage to work without sending ACK. Also I believe , you did that video demo over the air. How did you manage without CSMA :)

Best,
Bastian

Regards

Sumit


* It reminds me of tunnel application which I ran on GNU Radio long back (2012 I guess). There was an application tunnel.py


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Dipl.-Inform. Bastian Bloessl
CONNECT Center
Trinity College Dublin

GitHub/Twitter: @bastibl
https://www.bastibl.net/

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Sumit Kumar