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ACI – Overlapping vs. Nonoverlapping Adjacent Channel Interference

Introduction Whether we are designing, troubleshooting or just reading about Wireless LANs, we come across the catchword ‘ACI’ (Adjacent Channel Interference). While most people are familiar with the concept of Overlapping ACI in the 2.4GHz frequency band (‘Don’t use Channel 1 and Channel 2 in neighboring BSSes, because they overlap’ or ‘Only use channels 1,6,11′), …

802.11w-2009 – Protected Management Frames (PMF): Overview And Lab Tests

Introduction The goal of the 802.11w amendment, which was ratified in 2009 and consolidated in the IEEE Std 802.11-2012, was to introduce a way to secure management frames against attacks. The best known attacks this amendment should eliminate are the “deauthentication” and “disassociation” attacks, which can be used for multiple reasons:  L2 DoS attack of …

ExtremeWireless WiNG: radios on DFS-Channels re-enter Scanning-Mode after being edited

Introduction Many times, there are small adjustments you have to implement in your live Wireless LAN environments. I personally am often faced with changes like these: – Adding a new SSID – Removing an unused SSID – Renaming an existing SSID – Changing the security settings (for example PSK) of an SSID – Adjusting the …

About Me

My name is Renzo Notter, and I am born in Switzerland in 1993. After my 4-year apprentiship as a computer scientist, I started working as a Network Operation Specialist in 2013. Early on, I ended up with the task of “administering the Wi-Fi” by coincidence and without really knowing what’s behind all this in the beginning. I  acquired my knowledge via “Learning by Doing”, which, in retrospective, left me with some fundamental gaps I whish I would have been able to fill in earlier. After 3 years, I was given the chance to start working as a Network Engineer,  and decided to educate myself , because I wanted to truly unerstand every bit and byte in the world of Wireless LAN – so I went full-nerd for more than half a year, and read through every book, article, blog-entry, forum and tutorial I could find. While doing that, I went on the CWNP-adventure, that took me through the tests CWTS, CWNA, CWDP, CWAP, CWSP.

So here I am now, with the 5 certificates in my pocket and the will to go further – there is still so much more I want to learn about this great technology.

With this website, I want to contribute a small part in the world of the 802.11-community. My goal is not to write about topics that are already covered in great depth on other websites by awesome specialists, but to write about problems and ideas I stumbled accross myself where I was not able to find the solutions or in-depth content anywhere.

If you have any questions or inputs, please do not hesitate to contact me through Twitter, Mail, LinkedIn or Xing.

Cheers, Renzo