So you should probably throw out the invalid frames before doing your count.Īuthentication rejected because of challenge failureĪuthentication rejected due to timeout waiting for next frame in sequenceĪssociation denied because AP is unable to handle additional associated stations Don't forget, Wireshark includes frames with invalid FCS (Conversely, OmniPeek does not). Tshark -r -d udp.port=5000,peekremote -R wlan.fc.retry=1You can then pipe that to, say "wc" and divide that number by the total # of packets to get retry %.
Tshark -r -R "wlan.fc.retry = 1" Set up a Cisco AP for remote packet captureĬonfig ap sniff 802.11b enable Read a pcap file captured via Cisco AP in 'sniffer mode', and decode it to show 802.11 (peekremote) packets (also apply a filter to show only 802.11 re-transmissions) Note, earlier versions of tshark/wireshark call it 'airopeek' instead of peekremote: Useful for piping to 'wc' to get retry %. Example applies a display filter for 802.11 retries. Read a pcap file & apply a display filter from CLI. if you'd like to capture 149 and 153, you'd choose 149 and 40MHz. If you want to capture at 40MHz, keep in mind you'll need to choose the primary channel. You can also alt-click the Wifi icon->open wireless diagnostics, then hit Command-2 and choose "frame capture". Tcpdump -s0 -I -i en0 -w /tmp/capture.pcapupdate: check out the following post for details on differences between ways of capturing in OSX System/Library/PrivateFrameworks/amework/Versions/Current/Resources/airport Using tcpdump, instead of gui: Other useful command is ' airport', like showing connection details, ssid's etc. usr/libexec/airportd en0 sniff It saves it to a file in /tmp
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