Re: [Discuss-gnuradio] IEEE802.11 transceiver - problems sending data

[Bastian Bloessl]

Hi,

this is a rather complex setup. I would not immediately run SSH, but start with 
a simple ping (test GNU Radio and the WiFi card as senders). Try to see what 
works and what goes wrong, for example, ARP (in both directions) or routing.

IIRC, the script just sets up ARP in one direction (from the SDR to the WiFi 
card). You will have to also add the corresponding entry in reverse direction. 
It’s not in the script since I always used the WiFi card of another PC.

Then use Wireshark to monitor GNU Radio (that’s what you might do at the 
moment) and also the WiFi card. This might help to understand what frames are 
actually sent, if they are OK (MAC, IP, BSS) and if they are successfully 
received by the WiFi card and the SDR.

(Also make sure that an SSH server is actually running.)

There are a lot of things that can go wrong in this setup. You should try to 
narrow it down a bit. Once you have a more specific problem, it might be easier 
to help. 

Best,
Bastian





> On 16. May 2017, at 16:57, Cristian Rodríguez <address@hidden> wrote:
> 
> Hi all.
> 
> I'm trying to run the file nic.sh (app for the transceiver flowgraph in 
> gnuradio) as in this youtube video of Bastian, but i can run it at all.
> 
> I have:
>       • USRP B210
>       • i7 4710HQ, 12 Gb RAM, USB 3.0.
>       • Ubuntu 16.04.2
> I'm doing 
> 
> I understand the proof as:
> 
> <image.png>
> 
> Then i just would have to reconfigure my PC MAC in the nic.sh file and 
> flowgraph, put a channel in the 2GHz band, set 20 Msamples/s and run it.
> 
> It is the main part of nic.sh file. I just changed my MAC and assigned the 
> 192.168.123.2 IP. The other is the same of i got in Github.
> 
> <image.png>
> 
> I did the same in the flowgraph (just in this WIFI MAC block).
> 
> <image.png>
> 
> Thus. I run the app by the terminal... ./nic.sh.
> 
> Later, i open another terminal and type ssh 192.168.123.2, and it doesn't 
> work as in the video. Then i check wireshark and it is that happens. I'm 
> receiving the petition of a TCP port but it for any reason is not working. In 
> this way i can't connect from the USRP B210 to my pc. I think my PC is not 
> answering the petition or something like that.
> 
> <image.png>
> 
> The MACs are as supposed (i Checked it in wireshark)
> <image.png>
> 
> Thanks in advance for the time to read it.
> 
> Best regards,
> 
> Cristian