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How the NAV Can Break Wi-Fi
NAV is Wi-Fi's virtual carrier-sensing mechanism. Continuously refreshing a spoofed CTS-to-self can create a continuous channel reservation — a Wi-Fi denial-of-service condition.
Read post Wi-Fi · SimulationAug 2026Set Up Virtual OpenWrt on Ubuntu with Simulated Wi-Fi Radios
Run OpenWrt in a QEMU/KVM VM with working APs you can manage from LuCI. No router, no antennas, no wireless card.
Read post Wi-Fi · MACJun 2026Non-Primary Channel Access (NPCA) in Wi-Fi 8
When a neighbor blocks your primary 20 MHz, Wi-Fi 8 lets a station relocate to clean spectrum it already owns. The triggers, timers and math.
Read post Wi-Fi · PHYJun 2026Why SIFS Is 10µs in 2.4 GHz and 16µs in 5 GHz
SIFS looks like it changes with the band, but it depends on the PHY type. The story of DSSS, OFDM and 802.11g Signal Extension.
Read post Wi-Fi · PHYJun 2026The Math Behind Wi-Fi Airtime Calculation
Where does 192 microseconds of airtime come from? A step-by-step trace from payload to OFDM symbols, from first principles.
Read post Wi-Fi · SimulationJun 2026Simulate a Full Wi-Fi Network in Software with mac80211_hwsim
Run a complete 802.11 network. AP, client, association, monitor mode and live capture in Wireshark with zero Wi-Fi radios.
Read post Wi-Fi · CaptureJun 2026Wi-Fi Frame Capture on Samsung (S24/S25) in Monitor Mode
Capture 802.11 frames in monitor mode on Samsung Galaxy devices with no root and no special permissions. A step-by-step guide.
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