![]() ![]() Your user does not have permission to capture packets on the. Some of the most common issues include: 1. In any case, it appears that turning the Wi-Fi off can sometimes produce this it did not do so when I tried it on my MacBook Pro running 10.15.3. It is possible that Wireshark does not see your interface for a variety of reasons. ![]() That's why updating to 10.15.2 or 10.15.3 causes the problem to show up. ![]() It appears, from, that 10.15 shipped with libpcap 1.8.1, which did not have the SIOCGIFMEDIA code 10.15.3 apparently (based on the output of tcpdump -version) ships with libpcap 1.9.1, which does have the problem. I included a patch for the change made to 's libpcap if they pick it up for a future Catalina release, that should fix the problem. I've just checked in a change to 's libpcap to treat EPWROFF as meaning "I don't know if this device is connected" rather than as an error I have also reported an error to Apple, telling them to pick up that change, as I assume they picked up that code from the libpcap (they haven't open-sourced their libpcap in a while, so I don't know that for certain). That set currently doesn't include EPWROFF ("Device power is off"), so that will cause an attempt to find all devices to fail with that error if that's what device llw0 reports. Tcpdump -Dand Wireshark's interface list use the same libpcap routine, and that code, at least in the version of libpcap, will, on macOS, do an SIOCGIFMEDIA on all devices it finds, and give up if it gets an error other than a small set of errors. This appears to be a libpcap issue, not a Wireshark issue, given that, in this question, somebody found that Apple's tcpdump, linked with Apple's libpcap, reported "tcpdump: SIOCGIFMEDIA on llw0 failed: Device power is off" for a tcpdump -D command. ![]()
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