In 802.11ax communications, the trigger frame is used for multiple purposes. One of them is to allocate ressources for a specific multi-user OFDMA transmission. In this article, we are going to take a deeper look at some of the interesting fields we will find in this trigger frame. For more details, you can look at section [...]
As you know, all data rates are changing with 802.11ax, Hence, the new MCS table you can find here: https://www.semfionetworks.com/blog/mcs-table-updated-with-80211ax-data-rates In this article, we will see how we can figure out the data rate of a specific 802.11ax data frame. If you want to know how to capture 802.11ax data frames, refer to this article [...]
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 [...]
This infographic was inspired by the work of Nigel Bowden and Devin Akin. Nigel wrote this really good article on DFS that you can find on his website wifinigel.blogpost.com. Devin presented a really detailed webinar on DFS in partnership with Netscout. You can find the recording here. I would encourage you to go and take a look at their ressources. Note: [...]
Today’s exercice is simple: study the beacon frame and try to figure out what characteristics of the Wi-Fi network are advertised. In this article, we will be focusing on IEEE 802.11k support. PRESENTATION OF IEEE 802.11K IEEE 802.11k-2008 or "Radio Resource Measurement" (not to confused with the Radio Resource Management used by Cisco Wireless LAN Controllers) [...]
This post is directly related to the following previous article: "Wireshark: How to check it a Wi-Fi Network Supports 802.11v". In the previous article, we talked about how to check if a specific Wi-Fi network is supporting IEEE 802.11v, from the access point perspective. Like anything in Wi-Fi, we need support from both the access [...]
Today's exercice is simple: study the beacon frame and try to figure out what characteristics of the Wi-Fi network are advertised. In this first article, we will be talking about 802.11v. PRESENTATION OF IEEE 802.11V IEEE 802.11v or BSS Transition is an amendment which was published in 2011 and added to the IEEE 802.11-2012 standards. [...]
I often use Wireshark as my go to packet analyzer. I like it but I feel like I always forget what the display filters are. So I always find myself searching them online over and over again. So I have decided to create a reference sheet I could store and share on the blog. Feel [...]
Studying for the CWAP exam, I was using Wireshark and wondering how to see if the traffic (data frames) I was capturing was using HT (or 802.11n). So this article will show you how to find out! Let's start by talking about the Wi-Fi frames: - PPDU (PLCP Packet Data Unit) : This is the [...]
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