This is a form of site contents, divided into topics

Documents and the WiFi AirTime Calculator

• The WiFi AirTime Calculator (understanding of the duration of a TXOP)
• OFDM, HT and VHT PHY cheat sheet (802.11 a/n/ac formats and PHY at one sheet)

802.11ax frame capturing

• 802.11ax OFDMA Frame Capturing (a summarization of the methods)
• My thoughts on 802.11ax OFDMA capturing in the future (Andrew McHale challenged me)
• [VLOG] How to capture 802 11ax OFDMA traffic with Jetson Nano (YouTube video)
• Wireless Capturing of UL OFDMA (the complete method, SU and both UL and DL OFDMA)
• Wireless Capturing of Multi-User OFDMA Frames (only SU and DL OFDMA)
• UL OFDMA, what do we see in Wireshark (only control frames during UL OFDMA)
• Remote Wireless Capturing with a Jetson Nano (with Jetson Nano connected with cross-connect cable)
• Capturing 802.11ax with the Jetson Nano (using Wireshark/display/mouse/keyboard on the Jetson Nano)
• Does my network do both DL and UL OFDMA? (capturing OFDMA without data frames, only control frames)

802.11ax OFDMA Theory

• 802.11ax Frame Aggregation, a case study (frame aggregation at the bit level)
• DL OFDMA, the RF Perspective (visualization of the RF during DL OFDMA)
• UL OFDMA- Make RF Collisions Work (visualization of the RF during UL OFDMA)
• UL OFDMA, basic Trigger Frame and Multi-STA BlockAck (describe the UL OFDMA control frames)
• HE MU-RTS and CTS deep-dive (MU-RTS and CTS, bit-by-bit)
• DL MU OFDMA bit-by-bit (DL OFDMA, bit-by-bit)

802.11 Theory

• The Importance of Detecting the 802.11 Preamble (the preamble versus CCA/CD)
• How To Differentiate Between 802.11 PHY Types (what happens after the L-SIG)
• WiFi “Ghost Frame”, What Is It? (what happens when demodulation fails)
• Can 802.11a be more efficient than 802.11ax? (the effects of longer preambes)
• The Legacy Length-field vs the WiFi AirTime Calculator on 802.11ax Aggregated Frames
• Data Rata vs Throughput, OFDM vs OFDMA (my WLPC presentation, very short)
• LENGTH-the Underestimated Parameter in 802.11 (Length field in L-SIG)

802.11 Quizzles

• Gjermunds WiFI Quizzle 1 (my Kahoot quizzle)
• Pcap-quiz #2, Fun with Beacons (using pcap to answer question)
• Pcap-quiz #1, 802.1X/EAP Authentication and Roaming (using pcap to answer question)

Fast Secure Roaming and Radio Resource Management (TPC)

• Make TPC work, is it possible? Part 2, from the WLC perspective (TPC and Cisco NDP)
• Make TPC work, is it possible? Part 1, theoretical approach (TPC and Cisco NDP)
• Fast Secure Roaming, part 2 (when I need a FSR recap, I read these two)
• Fast Secure Roaming Overview (when I need a FSR recap, I read these two)

Miscellaneous

• Remote Troubleshooting on Wifi with iOS Airport (helping my son in Portugal)
• Keep Your Basic WiFi Knowledge Warm (link to useful resources)
• Cisco 9800 CL and AP in FlexConnect (from before Cisco and other bloggers wrote better descriptions)
• Using WLANPi to capture on four 20MHz-channels (one Peter first rejected, then accepted. I was proud)
• WPA2 Enterprise and FlexConnect captured in Wireshark with Mac (my very very first serious article)
• Trouble ticket: Client transmit with 2ss, AP with 1ss (for historical reason, I was new to this)