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tcpdump not capturing channel and frequency


G4E
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I'm sniffing using:

tcpdump -i wlan0 -e

I'm not receiving any information about what channel or frequency is used. Is this normal for these nics? I've tried to change the channel using ifconfig but to no change. On my laptop i get information like: "6.0 Mb/s 5180 MHz 11a".

12:55:36.413325 8361052374567211200us tsft cfp 0.0 Mb/s 0 MHz Turbo -128dB signal [bit 29] BSSID:ff:ff:ff:ff:ff:ff DA:ff:ff:ff:ff:ff:ff
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