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Monitor mode (w. TP-Link WN722N & Fedora)
From: Fulko Hew <fulko.hew () gmail com>
Date: Mon, 28 Sep 2020 11:00:20 -0400
I'm trying to sniff my Wifi for a project, so I purchased a TP-Link WN722N USB adapter and followed the various instructions I've found on the Web. (I don't know if it's a Wireshark issue, a driver issue, or a Fedora issue.) ip link set wlan0 down iw wlan0 set monitor none ip link set wlan0 up When I plugged the adapter in I saw a new device 'wlp0s20f0u3' in addition to my internal adapter 'wlps20' Using the instructions, it failed: # iw set wlp0s20f0u3 down # iw wlp0s20f0u3 set monitor none command failed: No such device (-19) --> I don't know why? So now that I have 2 adapters, I enabled the TPLink as my network connection (successfully) and tried to put my on-board adapter into monitor mode, instead: # iw wlp2s0 set monitor none # iwconfig wlp2s0 IEEE 802.11 Mode:Monitor Tx-Power=22 dBm Retry short limit:7 RTS thr:off Fragment thr:off Power Management:on # iplink set wlp2s0 up # It looks good, so I start Wireshark (v 2.28) (Fedora 26), and look at Wireshark's 'capture options' table, it shows the interface, but under the heading 'Mon Mode', it shows disabled. (I also have 'Use promiscuous mode on all interfaces' enabled.) --> Why does it show disabled? --> Is it really disabled ? --> How do I know which frequencies (or bands) it might be listening on? I started sniffing, but it doesn't capture anything. ... And after about 2 minutes, I get a pop-up error message from Wireshark saying: "The network adapter on which the capture was being done is no longer running; the capture has stopped." Where to start ? Thanks Fulko
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- Monitor mode (w. TP-Link WN722N & Fedora) Fulko Hew (Sep 28)