Category: 802.11ax

London ON Wi-Fi Meetup 001 - Wi-Fi 6

1/27/2020

SemFio Networks, alongside Anixter and LHSC, organized the first Wi-Fi Meetup in London ON. The main topic of this first meetup was Wi-Fi 6.

The event was very nice and attracted network Engineers supporting large wireless infrastructure in London. We even had a couple of guys coming from the GTA. We will be organizing a second meetup in a couple of months and we have already gathered topics we want to talk about!

Here is the presentation I did gave at this event:

Here is a picture we captured at the end of the event:

Thank you everyone for coming and I am looking forward to the upcoming meetups.

Cheers

François Vergès

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802.11ax Remote Packet Captures using the Jetson Nano

10/9/2019

3 Comments

This solution will allow you to perform remote 802.11ax packet capture from your own laptop using the Jetson Nano.
The benefit of using the Jetson Nano (and the Intel AX200 Wi-Fi card) to perform 802.11ax packet capture is that you get a lot more information in the RadioTap Header you get.
The benefit of doing it remotely is that you never need to directly interact with the Jetson Nano OS (no need for keyboards, screens nor mouses)

To make it work, I received help from a couple of talented guys:

They pretty much found the solutions, I was just the one implementing it ;)

Hardware Requirements

Here is the equipment you need to make it work:

A Nvidia Jetson Nano
An Intel AX200 802.11ax Wi-Fi card
Dual band antennas (Here is the one I use)
OPTIONAL: A case for the Jetson Nano (Here is the one I use)

Initial Setup of the Jetson Nano

Here is what you need to do on the Jetson Nano right after you have loaded the image on the SD card and created your username name:

Initial Wireshark Configurations (On your laptop)

Then you need to configure Wireshark to do the following:

Establish a SSH connection between your laptop and the Jetson Nano
Run a tcpdump remotely on the Jetson Nano
Stream the packets back to your laptop

Thankfully for us, Wireshark has a plugin you can install to make it work. It is called SSHdump. You need to make sure that it is checked when you install Wireshark (Under the "Tool" section) (especially when you install Wireshark on Windows).

Capture Time!

When you are ready to perform the packet capture, first you need to SSH into your Jetson Nano and set the Wi-Fi card into monitor mode on the proper channel using the proper channel width:

Then you can open Wireshark. In the interface list, look for "SSH remote capture: sshdump" and click on the setting gear to modify its settings:

Under the server tab, enter the IP address of the Jetson Nano and enter "22" as the port used (since we are using SSH default port here):

Under the Authentication tab, enter the username and password to connect to your Jetson Nano.
Note: You will have to re-enter your password every time you want to do a packet capture.

Under the "Capture" tab, you need to enter the following command in the "Remote capture command" field: /usr/sbin/tcpdump -i wlan0mon -U -w -. Make sure that you also check the "Use sudo on the remote machine" check box:

Then you can click on "Start" and it will start capturing packets and streaming them back to your Wireshark session.

Additional Resources

Here are additional resources you can visit to get more details:

Remote Wireless Capturing with a Jetson Nano from Gjermund Raaen: https://gjermundraaen.com/2019/10/01/remote-wireless-capturing-with-a-jetson-nano/
Capturing 802.11ax with jetson nano from Gjermund Raaen: https://gjermundraaen.com/2019/09/25/capturing-802-11ax-with-jetson-nano/
Using the WLAN Pi to scan for networks in WiFi Explorer Pro from Adrian Granados: https://www.adriangranados.com/blog/wlanpi-as-a-sensor
You too can have a sub-$200 802.11ax client from John Kilpatrick: http://wifi.hypergeek.net/you-too-can-have-a-sub-200-11ax-client/
How to setup Wi-Fi 6 sniffer Wireshark in Ubuntu from Tiger Lee: https://wifilogic.wordpress.com/2019/09/21/how-to-setup-wifi6-sniffer-in-ubuntu/
The State of Wi-Fi 6 in Practise (WLPC EU Presentation): https://www.cleartosend.net/wp-content/uploads/2019/10/Wi-Fi6_in_the_real_world_wlpc_prague_2019.pdf

3 Comments

London ON Wi-Fi Meetup 001 - Wi-Fi 6

802.11ax Remote Packet Captures using the Jetson Nano

Hardware Requirements

Initial Setup of the Jetson Nano

Initial Wireshark Configurations (On your laptop)

Capture Time!

Additional Resources

François Vergès

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